China valve market with the continuous development of science and technology, but also to the high-tech, high-parameter, strong corrosion-resistant, high-life direction. Technology at home and abroad based on the analysis of valve and valve market demand both at home and abroad of the analysis, developed in recent years all sectors of industrial valves and valves with high-tech industry development trend and investment direction, are as follows:
1. Oil and gas well-head valve devices
Oil, natural gas wellhead valves are mainly used in the U.S. API6A standard single gate or board, there is no diversion diversion hole or holes parallel steel gate valve, slurry valve, angle-type throttle, oil-specific parallel-type regulating valve, oil check valve exclusive of straight-through processing, water injection \ polymer dedicated parallel valve, the clamp-type parallel valve, pilot-type safety valve and check valve.
Oil, natural gas wellhead valves with nominal pressure level for API2000psi, 3000psi, 5000psi, 10000psi, 15000psi, 20000psi; DN for DN46 ~ 228mm (113/16in ~ 9in); temperature rating of K (-60 ~ 182 ℃ ), L (-42 ~ 182 ℃), P (-29 ~ 182 ℃), R (room temperature), S (-18 ~ 166 ℃), T (-18 ~ 182 ℃), U (-18 ~ 121 ℃ ), V (2 ~ 121 ℃); material requirements for the AA, BB, CC, DD, EE, FF, HH; material performance requirements by 36K, 45K, 60K, 75K; products according to technical requirements PSL1 (product specification level 1) , PSL2 (product specification grade 2), PSL3 (product specification grade 3), PSL4 (product specification level 4).
2. Oil and natural gas valve with long-distance pipeline
Oil, natural gas long-distance pipeline with the main valve in order to comply with standards of the United States Kun PI6D single gate valve or board, there are holes or diversion diversion valve hole of the plate; steel or cast steel three-body, or to fit the entire welded ball valve fixed ball; oil seal or pressure balanced plug valves; Swing check valve or butterfly valve, pass the ball check valve; pigging valve.
Nominal pressure level of these valves for the CL150 (PN2.0MPa), CL300 (PN5.0MPa), CL400 (PN6.4MPa), CL600 (PN10.0MPa), CL900 (PN15.0MPa), CL1500 (PN25.0MPa), CL2500 (PN42.0MPa); DN for DN50 ~ 1500mm (2in ~ 60in); technical requirements for fire resistance test in accordance with ISO10497; valve pressure test in accordance with ISO5208.
3. Nuclear power valve
Nuclear power than conventional valve with a large thermal power station valve its technical characteristics and requirements higher. Valves are generally valve, valve, check valve, butterfly valve, safety valve, main steam isolation valve, ball valve, valve, relief valve and control valves, etc.; the highest representative of the technical parameters of the valve as follows: the largest diameter DN1200mm (the butterfly valve 3 nuclear), DN800mm (nuclear two of the main steam isolation valve), DN350mm (nuclear main circuit of a valve); maximum pressure: level of about 1500 pounds; maximum temperature: about 350 ℃ ; medium: the coolant (water diboride) and so on. The production of nuclear grade products require valve: usually by the nuclear industry standards EJ, U.S. ASME, IEEE standards and the French island of pressurized water reactor nuclear design and construction of machinery and equipment rules, such as RCC-M.
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Wednesday, March 23, 2011
Crane company has acquired the German company kelon bahe valve
Crane Energy Flow Solutions (CraneEnergyFlowSolutions) have purchased the entire share capital of the Group kelon bahe . Kreuztal, Germany-based world of the company's 640 employees and estimated 2008 sales of 91 million U.S. dollars. Acquisition included in the Slovenian manufacturing and foundry plant and a joint venture in China, the company's ownership. Group is a kelon bahe to electric power, oil and gas, chemicals, tankers, and water and environmental technology market with innovative, high-quality, highly engineered valves and valve company standards. The product range includes a wide range of quality industrial valves products group; special valves (three eccentric butterfly valve, metal hard sealing ball valve), custom valve (butterfly valve, Swing Check Valve, Soft Seal ball valves), as well as standard products (coarse filter, depending on the mirror, float,globe valve and gate valve, ball valve and throttle).
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We can offer more Knife Gate Valve Information.If you need us according your spcification to produce the Knife Gate Valve .
Need, please e-mail to valve401@gmail.com
Analysis of common failures of boiler safety valve (d)
The reason is that the main safety valve on the other hand, the moving parts and fixed parts of the friction between the too large will cause the main valve seat to slow to address this problem is the main safety valve moving parts and components with a fixed gap standards within the scope of the console.
2.5, the pressure relief valve low back seat
Block, low-pressure safety valve to the economic operation of the boiler against a great back seat is too low pressure will cause a lot of media time-out emissions, resulting in unnecessary energy loss. Such failures occur in the 200MW unit A49H used in pulse-type safety valve spring, the analysis is mainly due to the following factors:
First, the spring pulse of the discharge valve on a large quantity of steam, this form of safety valve in the open impulse, the dielectric constant discharge, and promote the main safety valve action.
On the one hand, pre-impulse pressure safety valve safety valve because the main output of the media and not continue to rise, so the steam inside the pulse tube or along the drum set me to continue the flow of gas in conjunction impulse impulse to maintain the safety valve safety valve action.
On the other hand as a result of such a safety valve type of impulse is the medium flow through the valve core and the orientation of the gap between the sets of the flow of the main safety valve piston chamber, the media out of impulse sealing surface safety valve, in its kinetic energy around the pressure areas, to spool up, they continue to meet the impulse discharge safety valve, steam emissions the greater the kinetic energy of the pressure zone valve core part of the pressure the greater the effect on the spool upward thrust of the greater, the less impulse valve easy back seat, this time to eliminate this failure is related to throttle small, so that the outflow of the medium impulse flow to reduce the safety valve to reduce pressure on the region of kinetic energy of the pressure relief valve so that the impulse back seat.
Block, low back pressure caused by the second factor is: spool and oriented with the gap set improperly, with the small gap in the safety valve Kai Block impulse, the moment in this part of the energy expenditure by a high pressure zone, will spool up, the delay time back seat, when the container down to low, the kinetic energy to reduce pressure on the pressure, impulse valve back seat.
Eliminate this failure is a serious examination of the valve core and parts of sets of size-oriented, with off-hour gap, reducing the valve sealing surface resistance Checkpoint-style steam valve cap or increase the diameter of valve and valve guide radial clearance between the sets of to increase the flow passage area of the site, so that when the steam flow through too much not to reduce expenses, increase of partial pressure of the kinetic energy of the formation of a high pressure zone.
Block, low back pressure caused by another reason is that the friction parts of the campaign, and some parts have a jam The solution is to check all moving parts carefully and strictly in accordance with standard maintenance overhaul of the parts, the parts will be adjusted to meet the gap standards, to remove the possibility of jam.
2.6, the frequency of safety valve jump
Refers to the frequency jump back seat after the safety valve, to be a slightly elevated pressure, safety valve will open, repeated several times there, a phenomenon known as the safety valve of the "frequency jump." Requirements of safety valve safety valve in the mechanical properties during the entire movement to open up to the required height cards do not allow stop there, tremor and frequency jump phenomenon. Jump frequency of safety valve seal is extremely detrimental to easily cause leakage sealing surface. Analysis of the main reasons for back seat with the safety valve of high pressure on the back seat pressure is high, medium container surplus emissions less back seat has a safety valve, when adjusted to run properly, the pressure vessel will soon or up, so also the result of valve movement, as this situation can throttle opening degree of the opening to be eliminated. After the throttle valve opening, leading to the main steam safety valve piston indoor source reduction, and promote the downward movement of power piston smaller, the main safety valve smaller chance of action in order to avoid a row to start the main safety valve.
2.7, a safety valve chatter
Safety valve in the emission arising in the course of the jitter phenomenon, saying it was a safety valve flutter, flutter can easily cause the occurrence of the phenomenon of metal fatigue, so that the mechanical properties of the decline in safety valve, resulting in serious equipment problems, the occurrence of chatter The main reasons for the following areas:
On the one hand, improper use of the valve, the discharge capacity of selected valve too (as opposed to the need in terms of emissions), the elimination method is to choose the valve should be as close as possible to the rated capacity of the necessary equipment emissions. On the other hand is due to imports of small diameter pipe, the valve is less than the import path, or importing too much resistance, the elimination of the method is installed in the valve, so that imports of valves tube diameter not less than the import Path or reduce the resistance to the import pipeline. Discharge pipe resistance is too large, resulting in excessive emissions of the North when the pressure valve is caused by the flutter of the factors that can reduce emissions through the resistance of pipeline to be addressed.
3, Conclusion
Boiler safety valve on the common cause of failure analysis and proposed a specific solution, although the utility boilers are the main safety valve, matching the composition of secondary valve and the use of mechanical and thermal control of dual protection, and some fault not occur, but only a full grasp of the safety valve to eliminate common failure causes and methods to deal with at the time of failure can be handy, to ensure the safe operation of equipment has an important significance. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
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2.5, the pressure relief valve low back seat
Block, low-pressure safety valve to the economic operation of the boiler against a great back seat is too low pressure will cause a lot of media time-out emissions, resulting in unnecessary energy loss. Such failures occur in the 200MW unit A49H used in pulse-type safety valve spring, the analysis is mainly due to the following factors:
First, the spring pulse of the discharge valve on a large quantity of steam, this form of safety valve in the open impulse, the dielectric constant discharge, and promote the main safety valve action.
On the one hand, pre-impulse pressure safety valve safety valve because the main output of the media and not continue to rise, so the steam inside the pulse tube or along the drum set me to continue the flow of gas in conjunction impulse impulse to maintain the safety valve safety valve action.
On the other hand as a result of such a safety valve type of impulse is the medium flow through the valve core and the orientation of the gap between the sets of the flow of the main safety valve piston chamber, the media out of impulse sealing surface safety valve, in its kinetic energy around the pressure areas, to spool up, they continue to meet the impulse discharge safety valve, steam emissions the greater the kinetic energy of the pressure zone valve core part of the pressure the greater the effect on the spool upward thrust of the greater, the less impulse valve easy back seat, this time to eliminate this failure is related to throttle small, so that the outflow of the medium impulse flow to reduce the safety valve to reduce pressure on the region of kinetic energy of the pressure relief valve so that the impulse back seat.
Block, low back pressure caused by the second factor is: spool and oriented with the gap set improperly, with the small gap in the safety valve Kai Block impulse, the moment in this part of the energy expenditure by a high pressure zone, will spool up, the delay time back seat, when the container down to low, the kinetic energy to reduce pressure on the pressure, impulse valve back seat.
Eliminate this failure is a serious examination of the valve core and parts of sets of size-oriented, with off-hour gap, reducing the valve sealing surface resistance Checkpoint-style steam valve cap or increase the diameter of valve and valve guide radial clearance between the sets of to increase the flow passage area of the site, so that when the steam flow through too much not to reduce expenses, increase of partial pressure of the kinetic energy of the formation of a high pressure zone.
Block, low back pressure caused by another reason is that the friction parts of the campaign, and some parts have a jam The solution is to check all moving parts carefully and strictly in accordance with standard maintenance overhaul of the parts, the parts will be adjusted to meet the gap standards, to remove the possibility of jam.
2.6, the frequency of safety valve jump
Refers to the frequency jump back seat after the safety valve, to be a slightly elevated pressure, safety valve will open, repeated several times there, a phenomenon known as the safety valve of the "frequency jump." Requirements of safety valve safety valve in the mechanical properties during the entire movement to open up to the required height cards do not allow stop there, tremor and frequency jump phenomenon. Jump frequency of safety valve seal is extremely detrimental to easily cause leakage sealing surface. Analysis of the main reasons for back seat with the safety valve of high pressure on the back seat pressure is high, medium container surplus emissions less back seat has a safety valve, when adjusted to run properly, the pressure vessel will soon or up, so also the result of valve movement, as this situation can throttle opening degree of the opening to be eliminated. After the throttle valve opening, leading to the main steam safety valve piston indoor source reduction, and promote the downward movement of power piston smaller, the main safety valve smaller chance of action in order to avoid a row to start the main safety valve.
2.7, a safety valve chatter
Safety valve in the emission arising in the course of the jitter phenomenon, saying it was a safety valve flutter, flutter can easily cause the occurrence of the phenomenon of metal fatigue, so that the mechanical properties of the decline in safety valve, resulting in serious equipment problems, the occurrence of chatter The main reasons for the following areas:
On the one hand, improper use of the valve, the discharge capacity of selected valve too (as opposed to the need in terms of emissions), the elimination method is to choose the valve should be as close as possible to the rated capacity of the necessary equipment emissions. On the other hand is due to imports of small diameter pipe, the valve is less than the import path, or importing too much resistance, the elimination of the method is installed in the valve, so that imports of valves tube diameter not less than the import Path or reduce the resistance to the import pipeline. Discharge pipe resistance is too large, resulting in excessive emissions of the North when the pressure valve is caused by the flutter of the factors that can reduce emissions through the resistance of pipeline to be addressed.
3, Conclusion
Boiler safety valve on the common cause of failure analysis and proposed a specific solution, although the utility boilers are the main safety valve, matching the composition of secondary valve and the use of mechanical and thermal control of dual protection, and some fault not occur, but only a full grasp of the safety valve to eliminate common failure causes and methods to deal with at the time of failure can be handy, to ensure the safe operation of equipment has an important significance. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
We can offer more Knife Gate Valve Information.If you need us according your spcification to produce the Knife Gate Valve .
Need, please e-mail to valve401@gmail.com
The cause of the malfunction of the servo valve and the removal of
Servo valve failure in the electro-hydraulic servo system is often not debugging or found in normal circumstances. So here is the system sometimes including amplifiers, feedback from agencies, implementing agencies, such as fault, sometimes it is the issue of servo valve. Therefore, we must first understand the system, or servo-valve problem. Commonly used to solve this question is: First, the conditional discharge valve, the test retest click. Second, in most cases no such conditions, when a simple approach is to open-loop system, spare independent DC power supply, the servo valve multimeter give money for different positive and negative current, the output from the valve case to determine whether the valve problems, what is wrong. Valve problem is to find system problems, such as: the implementation of institutions within the pass, and can cause system slow motion, hysteresis serious, or even unable to work; feedback signal circuit or disorders, etc., the problem amplifier output signal distortion or does not work, system ominous talk about here, the following breakdown of the main valve to talk about.
(1) valve does not work
The reasons are: motor coil disconnected; have access to oil or oil into the mouth anti-access. There may be pre-grade plug, the valve core is stuck in the middle of dead-zone position, spool stuck in the middle of course, this low probability. Coil motor coil in series or two then the anti-parallel, and the two coils form a magnetic force is offset.
(2) The valve has a fixed output, but has been out of control
Reasons: pre-class blocked nozzle, spool card was stolen goods and body deformation caused by a stuck spool, or internal protection of the filter was blocked stolen goods. To replace the filter,往厂cleaning, repair.
(3) valve slow response, slow response, etc.
Reasons: there is pressure to reduce oil supply system, the protection of the local filter to plug, some zero valve body loose, and loose motor parts, or dynamic valve control spool with the dynamic between the loose. Implementation of power system components within the pass, and it is one of the reasons why. The dirty oil, valves resolution variation, hysteresis is also one of the reasons widened.
(4) a higher frequency of system vibration and noise
Reasons: the air mixed with oil in heavy, dirty oil off; System Gain of high regard from the power amplifier noise, servo valve coil and the valve casing and a bad ground wire insulation is a non-Qualcomm Qualcomm, Flutter signal system is too large or the resonant frequency caused by the phenomenon of the system relatively low again and chose the high frequency of servo valve.
(5) then the output valve is then negative, not for control, as a "switch" control.
Reasons: feedback from agencies within the servo valve failure, or system feedback disconnected, or is there some kind of positive feedback phenomenon.
(6) oil
Reasons: the installation of Block, the poor quality of surface processing, not sealed. I ring the quality of valves, valve seals, etc. on the damaged plug. Motor oil between the cover and body, it may be spring tube rupture, the internal pipeline rupture.
Servo valve troubleshooting, and some may be excluded from their own, but many failures to valve to the production plant, on the experimental platform debugging rework, and then stressed again: Do not own valve removed, it is easily damaged parts of the servo valve.
More use of servo-valve units can be installed himself a simple test-bed to determine the system or the problem of valve, valve problems, can be used.
ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
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Need, please e-mail to valve401@gmail.com c
(1) valve does not work
The reasons are: motor coil disconnected; have access to oil or oil into the mouth anti-access. There may be pre-grade plug, the valve core is stuck in the middle of dead-zone position, spool stuck in the middle of course, this low probability. Coil motor coil in series or two then the anti-parallel, and the two coils form a magnetic force is offset.
(2) The valve has a fixed output, but has been out of control
Reasons: pre-class blocked nozzle, spool card was stolen goods and body deformation caused by a stuck spool, or internal protection of the filter was blocked stolen goods. To replace the filter,往厂cleaning, repair.
(3) valve slow response, slow response, etc.
Reasons: there is pressure to reduce oil supply system, the protection of the local filter to plug, some zero valve body loose, and loose motor parts, or dynamic valve control spool with the dynamic between the loose. Implementation of power system components within the pass, and it is one of the reasons why. The dirty oil, valves resolution variation, hysteresis is also one of the reasons widened.
(4) a higher frequency of system vibration and noise
Reasons: the air mixed with oil in heavy, dirty oil off; System Gain of high regard from the power amplifier noise, servo valve coil and the valve casing and a bad ground wire insulation is a non-Qualcomm Qualcomm, Flutter signal system is too large or the resonant frequency caused by the phenomenon of the system relatively low again and chose the high frequency of servo valve.
(5) then the output valve is then negative, not for control, as a "switch" control.
Reasons: feedback from agencies within the servo valve failure, or system feedback disconnected, or is there some kind of positive feedback phenomenon.
(6) oil
Reasons: the installation of Block, the poor quality of surface processing, not sealed. I ring the quality of valves, valve seals, etc. on the damaged plug. Motor oil between the cover and body, it may be spring tube rupture, the internal pipeline rupture.
Servo valve troubleshooting, and some may be excluded from their own, but many failures to valve to the production plant, on the experimental platform debugging rework, and then stressed again: Do not own valve removed, it is easily damaged parts of the servo valve.
More use of servo-valve units can be installed himself a simple test-bed to determine the system or the problem of valve, valve problems, can be used.
ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
We can offer more Knife Gate Valve Information.If you need us according your spcification to produce the Knife Gate Valve .
Need, please e-mail to valve401@gmail.com c
To share practical techniques to deal with common faults valve 60 Law(b)
4) increasing savings gap law
Such as media or channels of the solid particles were washed away with welding slag and rust from, etc. I had not resulted in savings to plug, stuck faults, etc., would be able to reduce expenditure the expenditure of large pieces of space - an area of open cutting windows, open category of the spool, sleeve, because of their focus on reducing expenditure rather than the circumference area of distribution, fault can easily be excluded. If it is a single, two-seater shaped plunger valve spool can be replaced by "V"-shaped mouth of the spool, or into a sleeve valve. For example, a chemical plant have a regular two-seater stuck valve is recommended to use the sleeve valve, the problem to be resolved immediately. 5) medium washed Law
Washed their own use of medium energy, erosion and sediment away easily, easy to plug things in, so as to enhance the anti-function valve. Common methods are: ① flow into the use of closed type; ② using streamlined body; ③ raise the most serious erosion at the mouth, the use of this method to pay attention to enhancing cutting erosion resistant material capacity.
6) through angular law changed
For reversing the flow through S, the complex flow path, the upper and lower dead-capacity multi-cavity, in order to provide a medium where the precipitation. Angular connections like streaming media bend over 90 ℃, washed performance and small die area, designed to streamline easy. Therefore, through the use of the regulating valve can produce a small plug into the use of angular valve. Third, control valve solution leakage (6 methods)
1) increase in seal oil law
Of unused oil seal valve, may consider increasing the number of seal oil to improve the performance of stem seal.
2) increase the packing method
To enhance the packing of the stem of the sealing performance, can increase the packing method. Usually double-, multi-storey mixed-fill the form of a simple increase in quantity, such as the 3 by 5, the effect is not obvious.
3) the replacement of graphite packing method
Large-scale use of PTFE packing, its working temperature range of -20 ~ +200 ℃, the temperature at the maximum and minimum levels, changes in the larger, the seal will be decreased, aging fast, short life expectancy. Flexible graphite packing can overcome these shortcomings and long service life. Some of the factory and therefore all will be replaced by PTFE packing graphite packing, and even buy back the new valve will also be replaced by one of the PTFE packing graphite packing before use. However, the use of graphite packing back to the poor, and early reptiles have also produced the phenomenon, which must be considered.
4) change the flow in the stem-end home P2 Law
When △ P large, P1 and large, sealed sealed P2 than P1 difficulties. Therefore, the flow can be taken to change the method to replace P1 in P2 stem in the stem-end side, which is the pressure of high pressure valve is larger than effective. Such as bellows valves should be considered on the usually sealed P2. 5) sealing method using lens pad
For the upper and lower sealing cap, valve seats and the upper and lower valve sealing. If flat sealed under high temperature and pressure, poor seal, causing leakage, you can switch to pad sealed lens, can be satisfied with the results.
6) the replacement gasket
So far, most are still using gasket石棉板, at a high temperature, poor sealing performance, short life expectancy, caused by leakage. In such cases, would be able to spiral wound gasket, "O"-ring and so on, many plants have been taken.
Fourth, control valve solution Vibration (8 methods)
1) increase the stiffness method
And a slight vibration of the oscillation can be increased to eliminate or reduce stiffness, such as large selection of spring stiffness in favor of implementing agencies such as the piston approaches are feasible.
2) an increase in damping method
Increase the damping to increase the friction of the vibration, such as the valve plug valve sleeve may be "O"-ring seal, the greater the friction, such as graphite filler, which is to eliminate or reduce the vibration of a minor or have a certain role.
3) increasing the size-oriented, reducing the gap with the law
Cypriot valve axis oriented generally have a smaller size, all-valve clearance is generally greater, and 0.4 ~ lmm, which have a mechanical vibration is helpful. Therefore, in the event of minor mechanical vibration may be driven by increasing size, with the gap reduced to weaken the vibration.
4) changes in the shape of expenditure items, the elimination of resonance method
Due to the so-called local oscillator valve occurred in the high-speed flows, the pressure of the dramatic changes in the expenditure of the mouth, cutting pieces of the shape change can change the local oscillator frequency, the resonance is not strong compared to easy to solve. The specific method is to open in the vibration range surface turning spool 0.5 ~ 1.0mm. Family members such as a factory installed near a self-pressure regulating valve, due to resonance effects of workers啸喊have rest, we will spool out 0.5mm surface vehicles, the resonance disappeared Xiao call. 5) the replacement of cutting pieces of the elimination of resonance method
Its methods are: ① the flow characteristics of the replacement of several linear change, linear change of a few; ② the form of replacement spool. If the shaft-shaped plug replaced by "V"-shaped groove spool, the valve seat into a sleeve-type plug-axis type; the sleeve will be re-opened window of the sleeve, such as playing holes. Such as a nitrogen fertilizer plant a two-seater DN25 valve stem and valve core junction off the regular vibration, we have identified as the resonance will be replaced by a straight line on a number of characteristics of spool valve core, the problem is resolved. Another example of a laboratory Aviation Institute DN200 with a sleeve valve, rotary valve plug can have a strong cast, and will be re-opened a window to fight the sleeve of the sleeve hole, the rotation immediately disappear.
6) the type of replacement valve to eliminate the resonance.
Different structural forms of control valve, and its inherent natural frequency of different types of valve replacement is the elimination of a fundamental resonance of the most effective way. A valve in use is very powerful resonance vibration strongly --- (may be severe valve damage), strong rotation (or vibration stem was broken, broken), and have a strong noise (up to more than 100 db) the valve, as long as it replaced a different valve structure, effective immediately, a strong resonance disappeared miraculously. If a new plant expansion project vinylon choose a DN200 valve sleeve, the existence of these three phenomena, DN300 pipeline subsequent beating, valve plug rotation, more than 100 db of noise, resonance opening 20 ~ 70%, taking into resonance opening, and switch to a valve seat, the resonance disappeared, put into operation in the normal.
7) to reduce vibration cavitation
Cavitation bubble due to the breakdown of the vibration cavitation generated naturally reduce cavitation in the think of a way. ① so the impact of the breakdown bubble is not the role of energy in the solid surface, especially on the spool, but allow the liquid to absorb. Sleeve valve with this feature on, so you can plug-type valve core shaft into the sleeve-type. ② take to reduce all the way to cavitation, such as the increase in cutting resistance, increasing population pressure on flow reduction, decompression, such as classification or series.
8) Act to avoid blow-wave local oscillator
External local oscillator valve vibration caused by wave attack, which is obviously normal valve should work to avoid, if such a vibration, corresponding measures should be taken seven or regulating valve noise solution (8 methods)
1) the elimination of resonance noise law
Resonance only when the control valve, only energy generated superposition of the strong over 100 db of noise. Some strong performance for the vibration, noise is not, and some weak vibration, and noise is very large; some vibration and noise are larger. This noise produces a tone of voice transfer, and its frequency is generally 3000 ~ 7000 Hz. Clearly, the elimination of resonance, the noise will disappear naturally. See, for example, methods and more than 4.5 of 4), 5), 6).
2) the elimination of cavitation noise law
Cavitation is a major source of fluid dynamic noise. Cavitation, the bubble rupture have high-speed impact to the local produce strong turbulence, cavitation noise generated. This noise has a wide frequency range, resulting in voice chattered, and the fluid contains sand and gravel similar to the sound. Elimination of cavitation and reduces the elimination and effective way to reduce the noise.
3) the use of thick-walled pipe method
The use of thick-walled tube is a sound way to deal with one of the ways. Will enable the use of thin-walled noise increase of 5 decibels, the noise allows the use of thick-walled tubes reduce the 0 ~ 20 dB. The thicker wall of the same diameter, the same wall thickness of greater diameter, the better the effect of reducing noise. If DN200 pipeline, the 6.25,6.75,8,10,12.5,15,18,20,21.5 mm wall thickness, respectively, can reduce the noise, respectively -3.5, -2 (ie, increase), 0,3,6, 8,11,13,14.5 dB. Of course, the more thick-walled by the higher cost. 8, control valve solution Vibration (8 methods)
1) increase the stiffness method
And a slight vibration of the oscillation can be increased to eliminate or reduce stiffness, such as large selection of spring stiffness in favor of implementing agencies such as the piston approaches are feasible.
ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
We can offer more Knife Gate Valve Information.If you need us according your spcification to produce the Knife Gate Valve .
Need, please e-mail to valve401@gmail.com .
Such as media or channels of the solid particles were washed away with welding slag and rust from, etc. I had not resulted in savings to plug, stuck faults, etc., would be able to reduce expenditure the expenditure of large pieces of space - an area of open cutting windows, open category of the spool, sleeve, because of their focus on reducing expenditure rather than the circumference area of distribution, fault can easily be excluded. If it is a single, two-seater shaped plunger valve spool can be replaced by "V"-shaped mouth of the spool, or into a sleeve valve. For example, a chemical plant have a regular two-seater stuck valve is recommended to use the sleeve valve, the problem to be resolved immediately. 5) medium washed Law
Washed their own use of medium energy, erosion and sediment away easily, easy to plug things in, so as to enhance the anti-function valve. Common methods are: ① flow into the use of closed type; ② using streamlined body; ③ raise the most serious erosion at the mouth, the use of this method to pay attention to enhancing cutting erosion resistant material capacity.
6) through angular law changed
For reversing the flow through S, the complex flow path, the upper and lower dead-capacity multi-cavity, in order to provide a medium where the precipitation. Angular connections like streaming media bend over 90 ℃, washed performance and small die area, designed to streamline easy. Therefore, through the use of the regulating valve can produce a small plug into the use of angular valve. Third, control valve solution leakage (6 methods)
1) increase in seal oil law
Of unused oil seal valve, may consider increasing the number of seal oil to improve the performance of stem seal.
2) increase the packing method
To enhance the packing of the stem of the sealing performance, can increase the packing method. Usually double-, multi-storey mixed-fill the form of a simple increase in quantity, such as the 3 by 5, the effect is not obvious.
3) the replacement of graphite packing method
Large-scale use of PTFE packing, its working temperature range of -20 ~ +200 ℃, the temperature at the maximum and minimum levels, changes in the larger, the seal will be decreased, aging fast, short life expectancy. Flexible graphite packing can overcome these shortcomings and long service life. Some of the factory and therefore all will be replaced by PTFE packing graphite packing, and even buy back the new valve will also be replaced by one of the PTFE packing graphite packing before use. However, the use of graphite packing back to the poor, and early reptiles have also produced the phenomenon, which must be considered.
4) change the flow in the stem-end home P2 Law
When △ P large, P1 and large, sealed sealed P2 than P1 difficulties. Therefore, the flow can be taken to change the method to replace P1 in P2 stem in the stem-end side, which is the pressure of high pressure valve is larger than effective. Such as bellows valves should be considered on the usually sealed P2. 5) sealing method using lens pad
For the upper and lower sealing cap, valve seats and the upper and lower valve sealing. If flat sealed under high temperature and pressure, poor seal, causing leakage, you can switch to pad sealed lens, can be satisfied with the results.
6) the replacement gasket
So far, most are still using gasket石棉板, at a high temperature, poor sealing performance, short life expectancy, caused by leakage. In such cases, would be able to spiral wound gasket, "O"-ring and so on, many plants have been taken.
Fourth, control valve solution Vibration (8 methods)
1) increase the stiffness method
And a slight vibration of the oscillation can be increased to eliminate or reduce stiffness, such as large selection of spring stiffness in favor of implementing agencies such as the piston approaches are feasible.
2) an increase in damping method
Increase the damping to increase the friction of the vibration, such as the valve plug valve sleeve may be "O"-ring seal, the greater the friction, such as graphite filler, which is to eliminate or reduce the vibration of a minor or have a certain role.
3) increasing the size-oriented, reducing the gap with the law
Cypriot valve axis oriented generally have a smaller size, all-valve clearance is generally greater, and 0.4 ~ lmm, which have a mechanical vibration is helpful. Therefore, in the event of minor mechanical vibration may be driven by increasing size, with the gap reduced to weaken the vibration.
4) changes in the shape of expenditure items, the elimination of resonance method
Due to the so-called local oscillator valve occurred in the high-speed flows, the pressure of the dramatic changes in the expenditure of the mouth, cutting pieces of the shape change can change the local oscillator frequency, the resonance is not strong compared to easy to solve. The specific method is to open in the vibration range surface turning spool 0.5 ~ 1.0mm. Family members such as a factory installed near a self-pressure regulating valve, due to resonance effects of workers啸喊have rest, we will spool out 0.5mm surface vehicles, the resonance disappeared Xiao call. 5) the replacement of cutting pieces of the elimination of resonance method
Its methods are: ① the flow characteristics of the replacement of several linear change, linear change of a few; ② the form of replacement spool. If the shaft-shaped plug replaced by "V"-shaped groove spool, the valve seat into a sleeve-type plug-axis type; the sleeve will be re-opened window of the sleeve, such as playing holes. Such as a nitrogen fertilizer plant a two-seater DN25 valve stem and valve core junction off the regular vibration, we have identified as the resonance will be replaced by a straight line on a number of characteristics of spool valve core, the problem is resolved. Another example of a laboratory Aviation Institute DN200 with a sleeve valve, rotary valve plug can have a strong cast, and will be re-opened a window to fight the sleeve of the sleeve hole, the rotation immediately disappear.
6) the type of replacement valve to eliminate the resonance.
Different structural forms of control valve, and its inherent natural frequency of different types of valve replacement is the elimination of a fundamental resonance of the most effective way. A valve in use is very powerful resonance vibration strongly --- (may be severe valve damage), strong rotation (or vibration stem was broken, broken), and have a strong noise (up to more than 100 db) the valve, as long as it replaced a different valve structure, effective immediately, a strong resonance disappeared miraculously. If a new plant expansion project vinylon choose a DN200 valve sleeve, the existence of these three phenomena, DN300 pipeline subsequent beating, valve plug rotation, more than 100 db of noise, resonance opening 20 ~ 70%, taking into resonance opening, and switch to a valve seat, the resonance disappeared, put into operation in the normal.
7) to reduce vibration cavitation
Cavitation bubble due to the breakdown of the vibration cavitation generated naturally reduce cavitation in the think of a way. ① so the impact of the breakdown bubble is not the role of energy in the solid surface, especially on the spool, but allow the liquid to absorb. Sleeve valve with this feature on, so you can plug-type valve core shaft into the sleeve-type. ② take to reduce all the way to cavitation, such as the increase in cutting resistance, increasing population pressure on flow reduction, decompression, such as classification or series.
8) Act to avoid blow-wave local oscillator
External local oscillator valve vibration caused by wave attack, which is obviously normal valve should work to avoid, if such a vibration, corresponding measures should be taken seven or regulating valve noise solution (8 methods)
1) the elimination of resonance noise law
Resonance only when the control valve, only energy generated superposition of the strong over 100 db of noise. Some strong performance for the vibration, noise is not, and some weak vibration, and noise is very large; some vibration and noise are larger. This noise produces a tone of voice transfer, and its frequency is generally 3000 ~ 7000 Hz. Clearly, the elimination of resonance, the noise will disappear naturally. See, for example, methods and more than 4.5 of 4), 5), 6).
2) the elimination of cavitation noise law
Cavitation is a major source of fluid dynamic noise. Cavitation, the bubble rupture have high-speed impact to the local produce strong turbulence, cavitation noise generated. This noise has a wide frequency range, resulting in voice chattered, and the fluid contains sand and gravel similar to the sound. Elimination of cavitation and reduces the elimination and effective way to reduce the noise.
3) the use of thick-walled pipe method
The use of thick-walled tube is a sound way to deal with one of the ways. Will enable the use of thin-walled noise increase of 5 decibels, the noise allows the use of thick-walled tubes reduce the 0 ~ 20 dB. The thicker wall of the same diameter, the same wall thickness of greater diameter, the better the effect of reducing noise. If DN200 pipeline, the 6.25,6.75,8,10,12.5,15,18,20,21.5 mm wall thickness, respectively, can reduce the noise, respectively -3.5, -2 (ie, increase), 0,3,6, 8,11,13,14.5 dB. Of course, the more thick-walled by the higher cost. 8, control valve solution Vibration (8 methods)
1) increase the stiffness method
And a slight vibration of the oscillation can be increased to eliminate or reduce stiffness, such as large selection of spring stiffness in favor of implementing agencies such as the piston approaches are feasible.
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Saturday, March 12, 2011
Large high valves create low-cost high-quality nuclear grade valves made in China
Recently, the Dalian High-Valve Co., Ltd. (hereinafter referred to as "Dalian High") nuclear power plant workers out of Yang Jian busy day waiting period before the CNC machine tools more than 10 hours, the eyes are not willing to wink about.
Yang Jian, said that he "busy." August 15, he and his workers produced the first batch of 1,300 sets of valves to nuclear power plant in Liaoning red river "induction." Has 230 million yuan of the total value of orders for nuclear power valve, now have a single contract of 80 million yuan in the talks, Dalian natural high production line was operating at full capacity. First quarter of this year, Dalian high sales revenue of 59.63 million yuan, an increase of 86.75%, of which sales of nuclear power valve 5.5-fold increase.
All the nuclear reactors and nuclear power, the nuclear-level valve is an important guarantee for safe operation. However, China's nuclear power equipment in the process of localization, pumps and valves are seriously dragging the hind legs, become a nuclear-grade equipment made of a bottleneck. As the only two domestic level with nuclear qualified valves, one of the production, Dalian high competition in this area rivals "Huashan," the opponents of nuclear power is an international top valve manufacturers . Not long ago, with the world's largest maker of nuclear-grade check valve Velan --- French company after a competition, Dalian High-Fang Shan won the Qinshan Nuclear Power Project order check valve, which is of such valves the first time by the suppliers of domestic enterprises.
"The same technical level, the same high-quality, coupled with lower than 30% of each other offer a price advantage, and this is the magic weapon that we win." Nuclear power development Dalian Office high HU Li-ping said. Change from 2002 when the company, the Dalian High will lock the emerging nuclear power industry, nuclear power began in China R & D valve. Last year alone, the Dalian High-invested R & D budget of up to 1700 million yuan, nearly half of the profits that year.
High investment return was a high-yield, both at home and abroad a number of manufacturers and professional certification will be recognized certificate Dalian too high before the showrooms. Among these, the United States nuclear-grade equipment ASME Seal certification, so that Dalian has become the first high-third-generation nuclear power plant was an "admission ticket" of the valve manufacturer. Dalian has also maintained a high record of more than 5 each year of scientific and technological achievements of the national patent application and adoption of national, provincial and municipal identification. In accordance with national plans, by 2020, China's nuclear power installed capacity to 40 million kilowatts a breakthrough, and equipment to achieve 80% local production. This means that, when only one new nuclear power plant on the valve contains a huge 70 billion business, and now, Dalian High-the company's delivery order has been fixed to 2013.
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Need, please e-mail to valve401@gmail.com
Yang Jian, said that he "busy." August 15, he and his workers produced the first batch of 1,300 sets of valves to nuclear power plant in Liaoning red river "induction." Has 230 million yuan of the total value of orders for nuclear power valve, now have a single contract of 80 million yuan in the talks, Dalian natural high production line was operating at full capacity. First quarter of this year, Dalian high sales revenue of 59.63 million yuan, an increase of 86.75%, of which sales of nuclear power valve 5.5-fold increase.
All the nuclear reactors and nuclear power, the nuclear-level valve is an important guarantee for safe operation. However, China's nuclear power equipment in the process of localization, pumps and valves are seriously dragging the hind legs, become a nuclear-grade equipment made of a bottleneck. As the only two domestic level with nuclear qualified valves, one of the production, Dalian high competition in this area rivals "Huashan," the opponents of nuclear power is an international top valve manufacturers . Not long ago, with the world's largest maker of nuclear-grade check valve Velan --- French company after a competition, Dalian High-Fang Shan won the Qinshan Nuclear Power Project order check valve, which is of such valves the first time by the suppliers of domestic enterprises.
"The same technical level, the same high-quality, coupled with lower than 30% of each other offer a price advantage, and this is the magic weapon that we win." Nuclear power development Dalian Office high HU Li-ping said. Change from 2002 when the company, the Dalian High will lock the emerging nuclear power industry, nuclear power began in China R & D valve. Last year alone, the Dalian High-invested R & D budget of up to 1700 million yuan, nearly half of the profits that year.
High investment return was a high-yield, both at home and abroad a number of manufacturers and professional certification will be recognized certificate Dalian too high before the showrooms. Among these, the United States nuclear-grade equipment ASME Seal certification, so that Dalian has become the first high-third-generation nuclear power plant was an "admission ticket" of the valve manufacturer. Dalian has also maintained a high record of more than 5 each year of scientific and technological achievements of the national patent application and adoption of national, provincial and municipal identification. In accordance with national plans, by 2020, China's nuclear power installed capacity to 40 million kilowatts a breakthrough, and equipment to achieve 80% local production. This means that, when only one new nuclear power plant on the valve contains a huge 70 billion business, and now, Dalian High-the company's delivery order has been fixed to 2013.
We can offer more Knife Gate Valve Information.If you need us according your spcification to produce the Knife Gate Valve .
Need, please e-mail to valve401@gmail.com
It should be noted that when the valve Purchasing technical requirements which (a)
To this end, prepared to discuss this release, the revised feasibility of intra-industry exchanges, arising from the business concerns in this regard, to improve work in this area. 1.; Specifications and types of valves, pipes should be in accordance with the requirements of design documents. 1.2; the valve should be specified based on Model GB code requirements. If the enterprise standard models should be specified instructions. ? 1.3; valve working pressure of the working pressure ≥ pipeline, prices will not be affected under the premise of the valve can withstand working pressure pipe should be larger than the actual pressure of work; valve closed condition either side should be able to withstand 1.1 times the work pressure valve without leakage; valve open condition, valve body should be able to withstand twice the pressure valve work requirements. 1.4; valve manufacturing standards, should indicate the basis of the national standard code, if the enterprise standards, procurement contract shall be accompanied by a business document 2? Valve material? 2.1; valve material, gray cast iron pipe as a result of the progressive is not recommended the use of body-based material should be ductile iron, and indicate the grade and the actual casting of the physical and chemical test data. ? 2.2; stem material to stainless steel stem (2CR13), large diameter valves should be stainless steel stem inlay package. ? 2.3; nut material, the use of cast brass or cast aluminum bronze, and the hardness and strength are greater than the stem 2.4; stem bushing material, its hardness and strength shall be not more than stem and immersed in water conditions with the stem, not the formation of electrochemical corrosion body. 2.5; sealing surface of the material ① different types of valves, sealing methods and materials require different; ② ordinary wedge gate valve, the material铜环fixed way, grinding should be that way; ③ Soft sealing valve, the valve plate rubber lining material of the physico-chemical and health testing data; ④ butterfly valve body shall identify the material on the sealing surface and sealing surface material butterflies board; their physical and chemical test data, especially the health requirements of rubber, anti-aging performance, wear-resistant performance; usually small eyes, such as rubber and EPDM rubber, recycled plastic mixed prohibited. ? 2.6; valve shaft packing? ① network as a result of the valves, usually do not frequent sluicegate asked not to fill in a few years the activities do not fill the aging and long-term effects remain sealed; ② fill valve shaft should bear the frequent headstock, the sealing effect of the good; ③ the light of the above requirements, fill valve axis does not strive for life or not to replace more than a decade;? ④ For replacement of packing, valve design should be considered to have the situation under pressure to replace the measures . 3? Speed gearbox 3.1; box inside and outside the anti-corrosion materials and principles with Valve. ? 3.2; box measures should be sealed, after the tank assembly to be capable of sustaining the status of three meters of water immersion. Box 3.3 on the hoist limit devices, the adjustment nut should be箱体外. ? 3.4; drive the structural design of a reasonable gate valve when the drive shaft can only rotate, did not make it up and down a rocky ledge, moderate occlusal transmission components, with no separation of the load when the sliding headstock. ? 3.5 ; Transmission Box Office with the valve shaft seal without leakage can not be connected whole. ? 3.6;箱体外no debris, gear grease occlusal protection shall be provided. ? 4? Valve operation of institutions 4. Valve operation of the hoist direction, shall be clockwise to close. ? 4.2 ; As a result of pipeline valves,
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Analysis of common failures of boiler safety valve (a)
1, Introduction
Is a very important safety valve to protect the valves, widely used in a variety of pressure vessels and piping system, when the system pressure exceeds the set pressure value, it will automatically open, the excess emissions into the atmosphere of the medium and to pressure vessels to ensure the safe operation of pipeline systems and to prevent accidents, and when the system pressure back down to work pressure or slightly below the pressure of work and can automatically shut down. Safety work is directly related to the reliability of equipment and personal safety, it is necessary to pay attention.
2, safety analysis of common causes and solutions
2.1, valve leakage
In the normal operating pressure equipment, valves and valve seat sealing surface took place more than allowed levels of leakage, valve leakage will not only cause loss of media. In addition, the media will continue to leak so hard sealing material destruction, but common safety valve sealing surface of metal materials are metallic materials, although the formation make it bright and clean, but in the medium under pressure to do that do not leak very difficult. Therefore, the working medium is steam safety valve, set pressure value, if the naked eye can not see the export side, but also to listen to no leakage on the sealing performance that is qualified. Generally caused by valve leakage is due mainly to the following three conditions:
A situation is that the dirt fell on sealed surface impurities will stay sealed mat surface, resulting in valve core and the gap between the valve seat, which valve leakage. Eliminate this failure is clear that the sealing surface of falling dirt and impurities, the general shutdown in preparation for the size of the boiler repair, the first security door so steelyard weight test run, if the leakage was found after shutdown for the disintegration of maintenance, if it is point furnace steelyard weight test run after the security gate leakage was found, it is estimated that this situation is caused by the stone roller in the running after 20 minutes cooling time before running the rudder on the sealing surface to erosion.
Another situation is the sealing surface damage. Sealing surface damage caused by the following main reasons: First, material adverse sealing surface. For example, in the furnace 3 to 9, the main security gate as a result of many years of maintenance, the main security gate valve core and valve seat sealing surface have been developed generally very low, so that the hardness of the sealing surface is also greatly reduced, resulting in sealing performance, the elimination of such is the best way is to continue turning the original sealing surface, and then asked to re-surfacing by drawing processing, improve the surface hardness of the sealing surface. Attention to a certain process to ensure the quality of processing, such as the sealing surface cracks, defects such as trachoma must go on after the turning process. New processing spool valve seat must be in line with requirements of drawings. General YST103 currently used for processing steel welding rod spool sealing surface on the relatively good results. Second, repair of poor quality, the spool valve seat grinding quality standards can not eliminate this failure is based on the degree of injury after turning the use of abrasive or abrasive methods to repair sealing surface.
Another safety valve leakage caused due to improper assembly or improper parts size. Spool in the valve seat assembly process is not fully to have a light or a combination of surface phenomena, or spool valve seat sealing surface is not conducive to sealing too. The elimination method is to check with the space around the spool size and uniformity to ensure the valve core hole with the top sealing surface异正degrees, inspection departments do not allow lift spool space; in accordance with the drawings called for a suitable sealing surface to reduce the width to achieve effective sealing .
2.2, combined with body surface leakage
Means the combination of upper and lower body surface between the leakage phenomenon, caused by leakage of the main reasons that the following aspects: First, combined with the bolt face tight or tight enough partial force, resulting in a bad combination of surface sealing.
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Fixed air flow valve in the ventilation and air conditioning system application
Fixed air flow valve is a mechanical self-device applications that require fixed air flow ventilation and air conditioning systems. Scheduled air volume air flow control valve does not require external power, it relies on the wind pipe air force to locate the control valve position, and thus the entire range of pressure difference will be maintained at pre-set air flow on.
(A) in the new Air System
At present, in China, fan-coil air-conditioning and fresh air systems approach is still more common, particularly in some hotel rooms, most office buildings, office buildings have adopted this approach. Common practice is to set up a new air handling units on each floor, walkways, air-dried to lay new pipes, dozens of the root branch pipe from the mains, respectively, on access to each room. To hotel room, for example, each room air quantity is usually 100 m3 / h, how to do each branch pipe air flow are consistent? In general, designers tend to be in the new air branch pipe installing an air volume control valve, hoping to accomplish by means of the latter part of debugging air volume distribution. Since the new ventilation system under normal circumstances are dry tube length, short branch pipes, while the air volume control valve adjustment is neither intuitive, regulation accuracy is not satisfactory, Moreover, each room air quantity is only 100 m3 / h, air flow is very small, so debugging is almost can not be completed. Construction unit can do about a new measurement of the total air-dry air supply pipes to ensure that the air supply branch pipes sense of such a point where the wind. In order to ensure that all rooms are air quantity can be sent to meet the design values, and need a room in a construction unit Zaiqu room balance, we need only each new wind branch pipe installing a fixed air flow valve, the above problem is solved.
In high-rise residential buildings, office often holds worry about lack of fresh air volume, while designers often feel very aggrieved. Because from the drawing point of view, the values of ventilation rate standards are not low, but we tend to overlook a problem, how to design point of view to ensure that the actual results and fixed air flow valve in the fresh air system, the application is an effective measure.
Because there is currently scheduled to air volume valves mainly rely on imports more expensive, I suggest four or five-star hotels, high-grade office buildings to use more appropriate.
(B) Exhaust System
A good air-conditioning system design, and its ventilation system must be very reasonable, and this is often not given due attention. In the civil construction, particularly in high-rise building, the envelope of air tightness good, just less air flow can maintain the room pressure value. Approximately 85 ~ 90% of the volume of outdoor air must be exhausted to the outside through the exhaust organized, so as to ensure the air supply, exhaust air flow balance, otherwise no amount of fresh air rate can not be sent to the room. In the civil construction, the ventilation in general through the toilet, drinking water and other auxiliary space between the exhaust outdoors. In addition, sometimes a ventilation system should be further increased in order to guarantee delivery, exhaust balance. For the bathroom ventilation, common practice is to set up one for each bathroom, two bathroom ventilators, exhaust and ventilation shaft on the machine interlock. We know that high-rise buildings fresh air system should be run throughout the year, the corresponding ventilation system should be run throughout the year. In other words, people can not use the bathroom toilet ventilator to control the opening, located toilet ventilator, there is no need to. Moreover, a large fan with dozens of such a small exhaust fan system is running both difficult to match, and uneconomical. Exhaust capacity of 400m3 / h of the toilet ventilators have 40dB noise around, so that loss of a quiet toilet. A large number of bathroom ventilators also bring great trouble to maintain. To address this problem, we can cancel the bathroom ventilators, ventilation shaft on each floor in the addition of a branch pipe fixed air volume valves, shaft at the top of an exhaust fan is located. This ventilation system to ensure that roughly equal the amount of each layer of the exhaust, while the control system is simple, reliable, and the bathroom can be very quiet.
(C) VAV System
In the variable air volume air conditioning system, generally outside the area will adopt the variable air volume mode set air volume within the area will adopt the way, in a wind, air pressure changing the air supply system, air volume within the areas as set design is inseparable from the air flow valve.
(D) in the purification of air-conditioning system
In the clean air-conditioning system to maintain the value of critical pressure clean room, in the exhaust ventilation system or to send Canada to set air flow valve, can effectively guarantee the value of positive pressure clean room.
Clean operating room with surgery without positive pressure when required to keep the operating room, surgery to ensure positive pressure when the volume of outdoor air quantity needed to add the required volume of outdoor workers, surgery without positive pressure when the volume of outdoor air to only guarantee the required volume of outdoor air, the new air duct on the need to set up a double-digit fixed air volume valves.
(E) in the wind pipe on the application of balanced
In the entire air system, due to construction conditions, the impact of resistance among the various branch tube is certainly not balanced, generally use the three-way valves or a multi-leaf off the air flow control valve to complete the distribution. To ensure that important room or the main branch pipe on the amount of wind Buzhi Yu is too large or too small, to reduce debug blindness, may be appropriate to increase air flow valves set to replace the three-way valves or a multi-leaf off the valve.
(6), will feature the use of air volume
Fixed air flow valve is automatic machinery bodies, no external power, plus the electric actuator can be by remote control signal to change the flow settings. Fixed air flow valve in the delivery, ventilation systems can be applied, the working temperature is generally 10 ~ 50 ℃, pressure range of 50 ~ 1000Pa, the valve before the valve at least 50Pa differential pressure applications, or fixed air flow valve does not work. This point should be noted that, as the new air system air pressure value of fresh air units are generally not large. Fixed air flow valves installed regardless of location restrictions, but should ensure that the level of valve shaft, generally require a long side of the valve straight-line distance of 1.5 times and 0.5 times the duct entrance of a straight line from the exit duct. Fixed air flow valve control, high precision, scale external pointer shows flow to regulate the accuracy is about ± 4%, limiting not required to maintain, for matching with the system scheduled to air volume valves rectangular, circular, insulation, muffler type may choose.
As the balancing valve in the air-conditioning water system is increasingly being used by the general designer, as scheduled air volume valves because that is precisely adjustable, self-balancing features will also be in the delivery, exhaust system has been widely used.
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(A) in the new Air System
At present, in China, fan-coil air-conditioning and fresh air systems approach is still more common, particularly in some hotel rooms, most office buildings, office buildings have adopted this approach. Common practice is to set up a new air handling units on each floor, walkways, air-dried to lay new pipes, dozens of the root branch pipe from the mains, respectively, on access to each room. To hotel room, for example, each room air quantity is usually 100 m3 / h, how to do each branch pipe air flow are consistent? In general, designers tend to be in the new air branch pipe installing an air volume control valve, hoping to accomplish by means of the latter part of debugging air volume distribution. Since the new ventilation system under normal circumstances are dry tube length, short branch pipes, while the air volume control valve adjustment is neither intuitive, regulation accuracy is not satisfactory, Moreover, each room air quantity is only 100 m3 / h, air flow is very small, so debugging is almost can not be completed. Construction unit can do about a new measurement of the total air-dry air supply pipes to ensure that the air supply branch pipes sense of such a point where the wind. In order to ensure that all rooms are air quantity can be sent to meet the design values, and need a room in a construction unit Zaiqu room balance, we need only each new wind branch pipe installing a fixed air flow valve, the above problem is solved.
In high-rise residential buildings, office often holds worry about lack of fresh air volume, while designers often feel very aggrieved. Because from the drawing point of view, the values of ventilation rate standards are not low, but we tend to overlook a problem, how to design point of view to ensure that the actual results and fixed air flow valve in the fresh air system, the application is an effective measure.
Because there is currently scheduled to air volume valves mainly rely on imports more expensive, I suggest four or five-star hotels, high-grade office buildings to use more appropriate.
(B) Exhaust System
A good air-conditioning system design, and its ventilation system must be very reasonable, and this is often not given due attention. In the civil construction, particularly in high-rise building, the envelope of air tightness good, just less air flow can maintain the room pressure value. Approximately 85 ~ 90% of the volume of outdoor air must be exhausted to the outside through the exhaust organized, so as to ensure the air supply, exhaust air flow balance, otherwise no amount of fresh air rate can not be sent to the room. In the civil construction, the ventilation in general through the toilet, drinking water and other auxiliary space between the exhaust outdoors. In addition, sometimes a ventilation system should be further increased in order to guarantee delivery, exhaust balance. For the bathroom ventilation, common practice is to set up one for each bathroom, two bathroom ventilators, exhaust and ventilation shaft on the machine interlock. We know that high-rise buildings fresh air system should be run throughout the year, the corresponding ventilation system should be run throughout the year. In other words, people can not use the bathroom toilet ventilator to control the opening, located toilet ventilator, there is no need to. Moreover, a large fan with dozens of such a small exhaust fan system is running both difficult to match, and uneconomical. Exhaust capacity of 400m3 / h of the toilet ventilators have 40dB noise around, so that loss of a quiet toilet. A large number of bathroom ventilators also bring great trouble to maintain. To address this problem, we can cancel the bathroom ventilators, ventilation shaft on each floor in the addition of a branch pipe fixed air volume valves, shaft at the top of an exhaust fan is located. This ventilation system to ensure that roughly equal the amount of each layer of the exhaust, while the control system is simple, reliable, and the bathroom can be very quiet.
(C) VAV System
In the variable air volume air conditioning system, generally outside the area will adopt the variable air volume mode set air volume within the area will adopt the way, in a wind, air pressure changing the air supply system, air volume within the areas as set design is inseparable from the air flow valve.
(D) in the purification of air-conditioning system
In the clean air-conditioning system to maintain the value of critical pressure clean room, in the exhaust ventilation system or to send Canada to set air flow valve, can effectively guarantee the value of positive pressure clean room.
Clean operating room with surgery without positive pressure when required to keep the operating room, surgery to ensure positive pressure when the volume of outdoor air quantity needed to add the required volume of outdoor workers, surgery without positive pressure when the volume of outdoor air to only guarantee the required volume of outdoor air, the new air duct on the need to set up a double-digit fixed air volume valves.
(E) in the wind pipe on the application of balanced
In the entire air system, due to construction conditions, the impact of resistance among the various branch tube is certainly not balanced, generally use the three-way valves or a multi-leaf off the air flow control valve to complete the distribution. To ensure that important room or the main branch pipe on the amount of wind Buzhi Yu is too large or too small, to reduce debug blindness, may be appropriate to increase air flow valves set to replace the three-way valves or a multi-leaf off the valve.
(6), will feature the use of air volume
Fixed air flow valve is automatic machinery bodies, no external power, plus the electric actuator can be by remote control signal to change the flow settings. Fixed air flow valve in the delivery, ventilation systems can be applied, the working temperature is generally 10 ~ 50 ℃, pressure range of 50 ~ 1000Pa, the valve before the valve at least 50Pa differential pressure applications, or fixed air flow valve does not work. This point should be noted that, as the new air system air pressure value of fresh air units are generally not large. Fixed air flow valves installed regardless of location restrictions, but should ensure that the level of valve shaft, generally require a long side of the valve straight-line distance of 1.5 times and 0.5 times the duct entrance of a straight line from the exit duct. Fixed air flow valve control, high precision, scale external pointer shows flow to regulate the accuracy is about ± 4%, limiting not required to maintain, for matching with the system scheduled to air volume valves rectangular, circular, insulation, muffler type may choose.
As the balancing valve in the air-conditioning water system is increasingly being used by the general designer, as scheduled air volume valves because that is precisely adjustable, self-balancing features will also be in the delivery, exhaust system has been widely used.
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Structural characteristics of the track ball valve
Switch no wear: Ball deviate from the seat after the rotation, eliminating the friction with the valve seat to solve the traditional ball valve, gate valve, plug valve seat wear problems.
Single-seat design: the static single-track valve seat, can protect the bi-directional zero leakage, avoiding double-seat cavity pressure increases problems.
Wear a hard sealing surface spool: spool sealing surface layer of cemented carbide surfacing and polishing, to meet the media in a very demanding sealing occasions.
Pairs of stem-oriented marketing: Stem-oriented groove along a rigid guide pins slide smoothly control the stem of the movements and rotation.
Mechanical wedge tight power: stem lower end of the cam slope, which provides a mechanical wedge tight force, in order to ensure continuous spool pieces closely aligns with the seat edge.
Upload design: In the system, pressure relief, the available on-line inspection and repair, so that simplified maintenance.
Within the leakage detection: Valve to design a special device, available on-line detection of leakage within the valve.
Low-torque operation: Due to the track ball valve sealing surface without friction, rotation torque is small, except large size need to gear the outside world, can be equipped with a small gear.
The best flow characteristics: full-path and standard diameter have a high Cv value, reducing the pressure drop along the pipeline, so that the problem reduces wear and tear to a minimum.
Self-Cleaning: When the spool deviate from the valve seat, the media, along the sealing surface of a 360-degree movement of the medium, washed clean of impurities.
Can be injected into sealing grease: In the operation can be maintained, will inject grease through the grease seal device implantation, complete control will be valve to prevent leakage.
Long life: Track ball valve can be easy to replace those Sealing failure of ordinary ball valve, gate valve, globe valve, plug valves. The unique characteristics of the track ball can be effective in reducing the device failure rate, greatly reducing the user's use, maintenance costs.
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Single-seat design: the static single-track valve seat, can protect the bi-directional zero leakage, avoiding double-seat cavity pressure increases problems.
Wear a hard sealing surface spool: spool sealing surface layer of cemented carbide surfacing and polishing, to meet the media in a very demanding sealing occasions.
Pairs of stem-oriented marketing: Stem-oriented groove along a rigid guide pins slide smoothly control the stem of the movements and rotation.
Mechanical wedge tight power: stem lower end of the cam slope, which provides a mechanical wedge tight force, in order to ensure continuous spool pieces closely aligns with the seat edge.
Upload design: In the system, pressure relief, the available on-line inspection and repair, so that simplified maintenance.
Within the leakage detection: Valve to design a special device, available on-line detection of leakage within the valve.
Low-torque operation: Due to the track ball valve sealing surface without friction, rotation torque is small, except large size need to gear the outside world, can be equipped with a small gear.
The best flow characteristics: full-path and standard diameter have a high Cv value, reducing the pressure drop along the pipeline, so that the problem reduces wear and tear to a minimum.
Self-Cleaning: When the spool deviate from the valve seat, the media, along the sealing surface of a 360-degree movement of the medium, washed clean of impurities.
Can be injected into sealing grease: In the operation can be maintained, will inject grease through the grease seal device implantation, complete control will be valve to prevent leakage.
Long life: Track ball valve can be easy to replace those Sealing failure of ordinary ball valve, gate valve, globe valve, plug valves. The unique characteristics of the track ball can be effective in reducing the device failure rate, greatly reducing the user's use, maintenance costs.
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Wednesday, March 9, 2011
How to make better in the radiator valves play a role in (c)
This valve system is installed, consideration may be given in the first group of the front radiator inlet valve installed in the vicinity of Far, Far EasTone will valve temperature control sensors to be placed in the main room, such as master bedroom, living room . The drawbacks of this arrangement is to move through the valve, will lead to heating the entire room changes in water flow, and valve signal acquisition is only room for one of the signal, then there will be other room temperature fluctuations and precision can not be effective regulation. In this way could also be considered in the first group to install high-quality front-end radiator, opening with the linear relationship between flow control valve manually through the control valve regulating the system of rough. Radiator arrangement such as "standards" are not allowed, we do not recommend using this approach.
2) the level of single-tube by leaps and bounds: the level of single-tube by leaps and bounds in recent years the application of a more interior arrangement has the merit of each radiator can be accurate for temperature control, adapted to the user's personalized home request , also in line with the "household metering, sub-room temperature" of the policy requirements. At the same time as some high-temperature hot water (not through the radiator heat exchanger) flows to the next group of radiators, the next group to raise the water temperature of the radiator to ensure the quality of the heating.
Relative to other household level for the indoor ring arrangement, by leaps and bounds in single-tube is a relatively simple to adapt to a wide range of layout. In specific applications, the valve should be used in different products (including manual control valve). Its also a very wide range of application forms:
a, Two-valve control type across Canada in this way a relatively simple structure, low cost. However, in practical applications, there are some problems. Many of its projects, because of indiscriminate use of high resistance of the two-valve, causing the radiator into the water is too small. Some works, some of the wrong usage, in order to meet the needs of the radiator into the water, across the tube had to install a regulator valve to increase the resistance across the tube part. Even with the low resistance to the two pass radiator valves should also factor into the calculation of flow. Radiator inlet channel coefficient is part of the radiator and across the tube part of the ratio of channel resistance. Increase in the level across the single-tube system, the resistance ratio of more than 30% in general, to ensure the water flow of the radiator. However, this calculation more complicated.
B, type of bypass valve
In order to adapt to the indoor levels are one-pipe system plus applications across a number of manufacturers introduced a special kind of bypass valve, the valve to the radiator such access (including valve) and a combination of bypass slip overall, and slip into a bypass resistance adjustable bypass valve. The advantage of simplifying the calculation and installation, and as a result of an adjustable bypass valve on the system to adapt to a wide range of specific conditions in accordance with a separate regulation.
Such a bypass valve can also be calculated into the flow coefficient of the radiator. In some projects have already been adopted gradually.
C, other special type of valve
Currently on the market there were a lot of new heat sink, in order to meet these new radiator, all kinds of special type of valve products came into being.
3) the level of twin-tube type.
Household level may also be a twin-tube radiators in each inlet valve is installed to carry out sub-room temperature control. The use of such arrangement, heating of good quality can be multiple sets of radiator series of different radiator valves regulate the system through the impact of small, but regardless of the fraction or fraction of the level of twin-tube arrangement, the interior are more complicated pipe layout, the overall decoration of the room, looking a certain effect.
And vertical layout of such a dual-track system, the greater the resistance the end, the system the smaller the volatility of its impact, it should choose the high resistance of the radiator valves.
4) a twin-tube radiation.
Such arrangements have also been known as the "octopus-style" layout, but also the level of belonging to the indoor area of a twin-tube. Installed at the entrance points in each household / watershed, and sub / catchment一环讲each device connected to a radiator. The advantage of flexible arrangements, which will help to carry out at room temperature, but more complex arrangement of pipes, cost over the previous several high indoor layout. In such a system should also refer to two-pipe system using high-resistance valve, if the use of reliable manual control valve can be installed in the inlet end of each radiator can be installed in each sub / Set Water carrying out centralized control.
In August 2003, the MOC issued a "Circular on the work of the urban heating system reform guidance" clearly stipulates that in the future, new public buildings and town houses, where the use of central heating facilities must be designed, installed splitting with temperature measurement and heating system control functions, and implementation of household energy use metering and charging of the new approach. Into the 21st century, the broad masses of the people on energy saving and thermal comfort of the continually increasing demands from household metering, at room temperature has been the policy of the people. Radiator valves will also be more widely used. However, the valve can not be a simple matter of a loaded, need to go through detailed and in-depth understanding of computing products, the use of different systems for different types of valves, at the same time when the installation and post-testing should also be carried out with the design and manufacturer good communication, in accordance with appropriate adjustments to the specific circumstances in order to achieve, the purpose of fair use.
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2) the level of single-tube by leaps and bounds: the level of single-tube by leaps and bounds in recent years the application of a more interior arrangement has the merit of each radiator can be accurate for temperature control, adapted to the user's personalized home request , also in line with the "household metering, sub-room temperature" of the policy requirements. At the same time as some high-temperature hot water (not through the radiator heat exchanger) flows to the next group of radiators, the next group to raise the water temperature of the radiator to ensure the quality of the heating.
Relative to other household level for the indoor ring arrangement, by leaps and bounds in single-tube is a relatively simple to adapt to a wide range of layout. In specific applications, the valve should be used in different products (including manual control valve). Its also a very wide range of application forms:
a, Two-valve control type across Canada in this way a relatively simple structure, low cost. However, in practical applications, there are some problems. Many of its projects, because of indiscriminate use of high resistance of the two-valve, causing the radiator into the water is too small. Some works, some of the wrong usage, in order to meet the needs of the radiator into the water, across the tube had to install a regulator valve to increase the resistance across the tube part. Even with the low resistance to the two pass radiator valves should also factor into the calculation of flow. Radiator inlet channel coefficient is part of the radiator and across the tube part of the ratio of channel resistance. Increase in the level across the single-tube system, the resistance ratio of more than 30% in general, to ensure the water flow of the radiator. However, this calculation more complicated.
B, type of bypass valve
In order to adapt to the indoor levels are one-pipe system plus applications across a number of manufacturers introduced a special kind of bypass valve, the valve to the radiator such access (including valve) and a combination of bypass slip overall, and slip into a bypass resistance adjustable bypass valve. The advantage of simplifying the calculation and installation, and as a result of an adjustable bypass valve on the system to adapt to a wide range of specific conditions in accordance with a separate regulation.
Such a bypass valve can also be calculated into the flow coefficient of the radiator. In some projects have already been adopted gradually.
C, other special type of valve
Currently on the market there were a lot of new heat sink, in order to meet these new radiator, all kinds of special type of valve products came into being.
3) the level of twin-tube type.
Household level may also be a twin-tube radiators in each inlet valve is installed to carry out sub-room temperature control. The use of such arrangement, heating of good quality can be multiple sets of radiator series of different radiator valves regulate the system through the impact of small, but regardless of the fraction or fraction of the level of twin-tube arrangement, the interior are more complicated pipe layout, the overall decoration of the room, looking a certain effect.
And vertical layout of such a dual-track system, the greater the resistance the end, the system the smaller the volatility of its impact, it should choose the high resistance of the radiator valves.
4) a twin-tube radiation.
Such arrangements have also been known as the "octopus-style" layout, but also the level of belonging to the indoor area of a twin-tube. Installed at the entrance points in each household / watershed, and sub / catchment一环讲each device connected to a radiator. The advantage of flexible arrangements, which will help to carry out at room temperature, but more complex arrangement of pipes, cost over the previous several high indoor layout. In such a system should also refer to two-pipe system using high-resistance valve, if the use of reliable manual control valve can be installed in the inlet end of each radiator can be installed in each sub / Set Water carrying out centralized control.
In August 2003, the MOC issued a "Circular on the work of the urban heating system reform guidance" clearly stipulates that in the future, new public buildings and town houses, where the use of central heating facilities must be designed, installed splitting with temperature measurement and heating system control functions, and implementation of household energy use metering and charging of the new approach. Into the 21st century, the broad masses of the people on energy saving and thermal comfort of the continually increasing demands from household metering, at room temperature has been the policy of the people. Radiator valves will also be more widely used. However, the valve can not be a simple matter of a loaded, need to go through detailed and in-depth understanding of computing products, the use of different systems for different types of valves, at the same time when the installation and post-testing should also be carried out with the design and manufacturer good communication, in accordance with appropriate adjustments to the specific circumstances in order to achieve, the purpose of fair use.
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Temperature Control Valve Selection(b)
I studied Italian Jiekemini that can be upgraded to automatic temperature control valve known as the double-adjustable temperature control valve, and other brands the biggest difference is that it is not a temporary one-time adjustment handle products, but specially designed application of the final product has a durable, spiral-shaped teeth thread lift is a special wear-resistant trapezoidal force, pitch up to 4.5mm. There is no worry about long-term use is, of course, temporary use of more no problem. The general regulation of the handle of the temporary borrowing of the thread teeth fixed for the fine thread, thread for general triangular-shaped teeth, the pitch of only 1.5mm. Such temporary handle to rotate three times the displacement of spool 4.5mm pitch with trapezoidal thread lap rather, it means that you will open the valve from the smallest to the largest three times the time required, which often need to adjust the temperature and control valve for regulating the inconvenience is obvious.
Let's look at automatic temperature control valve, automatic temperature control valve is usually divided into two parts, valve and valve head, valve commonly used method of production of copper casting or hot forging, valve head temperature sensors are generally divided liquid and solid: solid is divided into two kinds: one is the La-system, a hot-memory alloy. Currently on the market the popular media, most of paraffin solid sensor, with little heat memory alloy. Here's the market that are common to the respective valve and valve head to make a simple introduction to automatic temperature control valve for selection for reference.
Temperature Control Valve Body: Copper casting has the advantage of casting-shaped cavity can be complex products, mold cost less, lower production costs, but the drawback is more than casting defects, materials, compressive strength is poor; In contrast, the copper body by forging dies high value and complexity of forging equipment, production costs are high, but was able to obtain high-strength products, pressure capability is also much higher than the casting, while effectively avoiding casting defects. Thus less complex shape of the body, the professional manufacturers adopt traditional methods of forging body. But there are also some manufacturers to use traditional methods of casting, this requires the user to distinguish carefully. I think the use of a radiator temperature control valve on the valve body are simple, using hot forging is very appropriate.
In the selection body should pay attention to detail when there is a lot of valve design in order to be more simple, straight-through valve body inlet and outlet in the same axis, so that while the design is simple, but the displacement of spool space will be subject to We, therefore, the general type of valve spool displacement is only 2-3mm. I studied Italian Jiekemini automatic temperature control valve body, its straight-through body design is very unique, guaranteed entry and exit axis in the same circumstances, with the dislocation channel cavity design, effectively increase the displacement of the spool space, makes the spool displacement of up to 4-5mm, which in a recent design of an automatic temperature control valve is rare. Spool displacement increases the more dirty HVAC water is very beneficial, too small spool displacement in a relatively dirty water and scale HVAC serious cases will be very prone to gridlock.
Thermostatic valve head: Temperature Control Valve head temperature sensor inside the inner filling of liquid and solid media are generally two types of liquid and solid production process due to different manufacturers in general are usually a result of restrictions by the scale of production, often using only one A process to produce liquid or solid valve head, only a few large-scale production of both types of valve head chamber of commerce to facilitate customer choice. As for the difference between the two valve head, I think it should be said in HVAC applications, there is not much difference, if we must point out the difference of the Department, I think in the following aspects: First, different size. Generally speaking, the liquid to achieve the same thermal expansion, a larger displacement of the liquid, so temperature sensor larger, so larger valve heads, with a small proportion of valve sets a little after the lack of coordination, so is preferable to use solid-type valve something more beautiful head. Second, fluid sealing technology to be more complex, the production costs are relatively solid to be a little higher, so sales prices are often higher. 3, the liquid valve head to be a little more sensitive than the solid and this is the only liquid and solid advantages in comparison, but in the HVAC field in terms of a typical large-delay system, this advantage is not much effect. All in all, whether liquid or solid thermostatic valve head, as long as a qualified product, can fully meet the EN215 standard in the time sensitive requirements. I had two Italian Jiekemini medium temperature sensor in nation-building project quality inspection center to compare measurements and found no significant differences.
It is worth mentioning that the Italian Jiekemini the installation of thermostatic valve head is also very unique, the general temperature control valve installation of the first threaded connections are used, rather Jiekemini they used their own patented technology, fast card pressure-type connections, fast and safe, effective and easy to avoid the loose screw connection manually defects.
In the body of the connection alive Festival Jiekemini also has its own patent, that is connected to hot on the live festival PTFE self-dense material, to facilitate the installation or hemp rope without wrapping raw materials, effectively increasing installation of efficiency, and achieve an effective seal. To sum up, when you want to use temperature control valve should be careful when you transfer the election, so that money can at least make the best choice, whether it is manual, dual-adjustable or automatic temperature control valve, Italy Jie Kemi Nepal can be said is the perfect choice of partner, and complete products, attentive service, all so you can get satisfaction.
Generally speaking, if the most efficient as a choice for investment principles, without regard to the benefits of energy-saving automatic temperature control valve does not consider future upgrades for automatic temperature control valve, then you can choose a purely manual temperature control valve.
If, for with very little investment, taking into account the future by the owners themselves to upgrade to automatic temperature control valve, then the optional dual-adjustable temperature control valve, a dual-adjustable thermostatic valve with pure manual temperature control valve is basically the same price.
If you want to make a one-stop choice, then can choose automatic temperature control valve, generally prices are about three times the manual temperature control valve.
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Need, please e-mail to valve401@gmail.com t
Let's look at automatic temperature control valve, automatic temperature control valve is usually divided into two parts, valve and valve head, valve commonly used method of production of copper casting or hot forging, valve head temperature sensors are generally divided liquid and solid: solid is divided into two kinds: one is the La-system, a hot-memory alloy. Currently on the market the popular media, most of paraffin solid sensor, with little heat memory alloy. Here's the market that are common to the respective valve and valve head to make a simple introduction to automatic temperature control valve for selection for reference.
Temperature Control Valve Body: Copper casting has the advantage of casting-shaped cavity can be complex products, mold cost less, lower production costs, but the drawback is more than casting defects, materials, compressive strength is poor; In contrast, the copper body by forging dies high value and complexity of forging equipment, production costs are high, but was able to obtain high-strength products, pressure capability is also much higher than the casting, while effectively avoiding casting defects. Thus less complex shape of the body, the professional manufacturers adopt traditional methods of forging body. But there are also some manufacturers to use traditional methods of casting, this requires the user to distinguish carefully. I think the use of a radiator temperature control valve on the valve body are simple, using hot forging is very appropriate.
In the selection body should pay attention to detail when there is a lot of valve design in order to be more simple, straight-through valve body inlet and outlet in the same axis, so that while the design is simple, but the displacement of spool space will be subject to We, therefore, the general type of valve spool displacement is only 2-3mm. I studied Italian Jiekemini automatic temperature control valve body, its straight-through body design is very unique, guaranteed entry and exit axis in the same circumstances, with the dislocation channel cavity design, effectively increase the displacement of the spool space, makes the spool displacement of up to 4-5mm, which in a recent design of an automatic temperature control valve is rare. Spool displacement increases the more dirty HVAC water is very beneficial, too small spool displacement in a relatively dirty water and scale HVAC serious cases will be very prone to gridlock.
Thermostatic valve head: Temperature Control Valve head temperature sensor inside the inner filling of liquid and solid media are generally two types of liquid and solid production process due to different manufacturers in general are usually a result of restrictions by the scale of production, often using only one A process to produce liquid or solid valve head, only a few large-scale production of both types of valve head chamber of commerce to facilitate customer choice. As for the difference between the two valve head, I think it should be said in HVAC applications, there is not much difference, if we must point out the difference of the Department, I think in the following aspects: First, different size. Generally speaking, the liquid to achieve the same thermal expansion, a larger displacement of the liquid, so temperature sensor larger, so larger valve heads, with a small proportion of valve sets a little after the lack of coordination, so is preferable to use solid-type valve something more beautiful head. Second, fluid sealing technology to be more complex, the production costs are relatively solid to be a little higher, so sales prices are often higher. 3, the liquid valve head to be a little more sensitive than the solid and this is the only liquid and solid advantages in comparison, but in the HVAC field in terms of a typical large-delay system, this advantage is not much effect. All in all, whether liquid or solid thermostatic valve head, as long as a qualified product, can fully meet the EN215 standard in the time sensitive requirements. I had two Italian Jiekemini medium temperature sensor in nation-building project quality inspection center to compare measurements and found no significant differences.
It is worth mentioning that the Italian Jiekemini the installation of thermostatic valve head is also very unique, the general temperature control valve installation of the first threaded connections are used, rather Jiekemini they used their own patented technology, fast card pressure-type connections, fast and safe, effective and easy to avoid the loose screw connection manually defects.
In the body of the connection alive Festival Jiekemini also has its own patent, that is connected to hot on the live festival PTFE self-dense material, to facilitate the installation or hemp rope without wrapping raw materials, effectively increasing installation of efficiency, and achieve an effective seal. To sum up, when you want to use temperature control valve should be careful when you transfer the election, so that money can at least make the best choice, whether it is manual, dual-adjustable or automatic temperature control valve, Italy Jie Kemi Nepal can be said is the perfect choice of partner, and complete products, attentive service, all so you can get satisfaction.
Generally speaking, if the most efficient as a choice for investment principles, without regard to the benefits of energy-saving automatic temperature control valve does not consider future upgrades for automatic temperature control valve, then you can choose a purely manual temperature control valve.
If, for with very little investment, taking into account the future by the owners themselves to upgrade to automatic temperature control valve, then the optional dual-adjustable temperature control valve, a dual-adjustable thermostatic valve with pure manual temperature control valve is basically the same price.
If you want to make a one-stop choice, then can choose automatic temperature control valve, generally prices are about three times the manual temperature control valve.
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Traps correctly Selection Guide
Traps must use the best quality products, limited funds should be used in the knife's edge. The use of high-quality trap of saving energy and increasing production efficiency of the capital investment than the purchase of the trap a few times higher. Use good quality trap can provide a huge economic benefits. The use of a wide range of trap a large amount of 10 million can not be ignored, competent leaders at all levels should attach great importance.
Select steam traps require an accurate and precise blocking drainage, high sensitivity, can improve the utilization of steam is not leaking steam, work performance, reliable, high back pressure, long service life, easy maintenance is the preferred condition.
1. In the production process of heat transfer equipment, drying room, fast heat exchangers, distillation equipment, such as the need for fast heat up, there does not allow the production of condensed water heating equipment, we should use mechanical-type traps.
Mechanical-type traps are not working temperature and pressure changes, water that is Pai, undercooling is small, do not water in heating devices, can make heating equipment to achieve optimum operating temperature. Free float steam trap in which the structure of the most advanced, very sensitive, the smallest undercooling 0 ℃, can be ranked saturation temperature condensation of water, no steam leakage, merits the highest heating equipment can achieve the best efficiency. Production process heating equipment is the best trap.
2. In steam pipe, with heat pipes, heating equipment, temperature less demanding steam equipment, we should use static-type traps heat.
Static thermal cooling degree-type traps, Pai condensing water temperature is low, you can take full advantage of high-temperature sensible heat of condensation of water, energy-saving effect is good. Bellows steam trap in which the structure of the most advanced, no manual adjustment is very sensitive, maximum cooling rate has been 15 ℃ and 30 ℃ for the selection of two kinds of film boxes, not afraid of cold, small size, any position can be installed, in the pipeline repair and replacement of the valve core can save money and labor, long life and broad scope of application is static-type traps heat boutique.
3. In the high temperature and pressure superheated steam piping and equipment, should use special trap superheated steam.
Superheated steam traps in high-temperature, high pressure, low load operating conditions to isolate the bad disappear superheated steam produced by high-temperature condensate. One disc-type steam trap to use pipe insulation on the steam trap of the main steam rooms insulation, advanced structure, in the absence of condensate case, trap firmly closed, the work of high quality, long life, is a high-pressure hot special trap steam.
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Select steam traps require an accurate and precise blocking drainage, high sensitivity, can improve the utilization of steam is not leaking steam, work performance, reliable, high back pressure, long service life, easy maintenance is the preferred condition.
1. In the production process of heat transfer equipment, drying room, fast heat exchangers, distillation equipment, such as the need for fast heat up, there does not allow the production of condensed water heating equipment, we should use mechanical-type traps.
Mechanical-type traps are not working temperature and pressure changes, water that is Pai, undercooling is small, do not water in heating devices, can make heating equipment to achieve optimum operating temperature. Free float steam trap in which the structure of the most advanced, very sensitive, the smallest undercooling 0 ℃, can be ranked saturation temperature condensation of water, no steam leakage, merits the highest heating equipment can achieve the best efficiency. Production process heating equipment is the best trap.
2. In steam pipe, with heat pipes, heating equipment, temperature less demanding steam equipment, we should use static-type traps heat.
Static thermal cooling degree-type traps, Pai condensing water temperature is low, you can take full advantage of high-temperature sensible heat of condensation of water, energy-saving effect is good. Bellows steam trap in which the structure of the most advanced, no manual adjustment is very sensitive, maximum cooling rate has been 15 ℃ and 30 ℃ for the selection of two kinds of film boxes, not afraid of cold, small size, any position can be installed, in the pipeline repair and replacement of the valve core can save money and labor, long life and broad scope of application is static-type traps heat boutique.
3. In the high temperature and pressure superheated steam piping and equipment, should use special trap superheated steam.
Superheated steam traps in high-temperature, high pressure, low load operating conditions to isolate the bad disappear superheated steam produced by high-temperature condensate. One disc-type steam trap to use pipe insulation on the steam trap of the main steam rooms insulation, advanced structure, in the absence of condensate case, trap firmly closed, the work of high quality, long life, is a high-pressure hot special trap steam.
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Monday, March 7, 2011
Ceramic control valve to extend the method of life
Ceramic control valve is often used in case of adverse conditions, the technology installed in various pipelines, the working conditions is extremely complex, if there are problems with their bulky, difficult to identify the problem, people are often at a loss, but also put into operation system, system integrity, regulation of quality, environmental issues such as the rational use of ceramic valve to maximize their maintenance, extending its life, the use of ceramic valve is the primary problem.
Provided the following five kinds of ceramic control valve to extend the life expectancy method.
1, cleaning to extend the life of pipeline
Pipe welding in the slag, rust, lime slurry solidification of the waste products, wire, cloth, etc. to reduce expenditures, the mouth, causing the site-oriented plug or valve core to make fragments stuck, often put into operation in the new system and put into operation after overhaul early. This is the most common fault. In such cases, the washing must be disposed of opening, with the exception of掉渣objects, such as the sealing surface should be abrasive damage; At the same time will open at the end of Sierra Leone to掉渣red objects, and to flush pipe. Put into operation, let full-regulating valve, so that for some time before the mobile medium into normal operation.
2, increasing the work of opening the extension of life expectancy
At the beginning when the use of ceramic valve opening as far as working on the largest, such as 80%. In this way, the impurities in the initial tube erosion, wear and other damage occurred in the damaged valve core part outside the pipe to remove the impurities, the regulating valve and then adjust the opening slightly larger than normal opening of the local , with the fluid on the spool of the damage, increased traffic flow, reduce the corresponding opening so that the destruction continued, and gradually shut down, so take full advantage of all of the spool until the spool and the sealing surface root damage, can not be used so far.
3, increasing the diameter to increase life expectancy
We calculated the value of CV, CV is calculated in order to choose the correct valve for proper caliber. Flow in the same circumstances, the smaller the valve diameter, fluid flow rate the faster the medium on the spool and seals are also more severe erosion. The proposed opening of the user can adjust the scope of freedom, the appropriate valve size increase, thus play a role in reducing the wear and tear.
4, the transfer of damage location to enhance life
The destruction of the local transfer to a secondary position, to protect the valve core and valve seat sealing surface of the cutting surface. Ceramic ball valve is usually the most serious erosion, fluid is the fastest growing fluid beneath the site of imports, for now 3 ceramic ball valve structure can be the core for the ball to use, so a ball can import Office Core the use of four, so that the valve 4 times longer life.
5, to change the valve structure to improve life expectancy
Ceramic control valve using the first two structures, in order to more rational structure of the valve, into the now commonly used 3-type structure, such a structure because of its dual-seat, it also has the characteristics of a double seal. At the same time, ceramic ball valve in the selection of choice when the attention of the transition slope of valve design, this valve can reduce the impact of fluid.
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Provided the following five kinds of ceramic control valve to extend the life expectancy method.
1, cleaning to extend the life of pipeline
Pipe welding in the slag, rust, lime slurry solidification of the waste products, wire, cloth, etc. to reduce expenditures, the mouth, causing the site-oriented plug or valve core to make fragments stuck, often put into operation in the new system and put into operation after overhaul early. This is the most common fault. In such cases, the washing must be disposed of opening, with the exception of掉渣objects, such as the sealing surface should be abrasive damage; At the same time will open at the end of Sierra Leone to掉渣red objects, and to flush pipe. Put into operation, let full-regulating valve, so that for some time before the mobile medium into normal operation.
2, increasing the work of opening the extension of life expectancy
At the beginning when the use of ceramic valve opening as far as working on the largest, such as 80%. In this way, the impurities in the initial tube erosion, wear and other damage occurred in the damaged valve core part outside the pipe to remove the impurities, the regulating valve and then adjust the opening slightly larger than normal opening of the local , with the fluid on the spool of the damage, increased traffic flow, reduce the corresponding opening so that the destruction continued, and gradually shut down, so take full advantage of all of the spool until the spool and the sealing surface root damage, can not be used so far.
3, increasing the diameter to increase life expectancy
We calculated the value of CV, CV is calculated in order to choose the correct valve for proper caliber. Flow in the same circumstances, the smaller the valve diameter, fluid flow rate the faster the medium on the spool and seals are also more severe erosion. The proposed opening of the user can adjust the scope of freedom, the appropriate valve size increase, thus play a role in reducing the wear and tear.
4, the transfer of damage location to enhance life
The destruction of the local transfer to a secondary position, to protect the valve core and valve seat sealing surface of the cutting surface. Ceramic ball valve is usually the most serious erosion, fluid is the fastest growing fluid beneath the site of imports, for now 3 ceramic ball valve structure can be the core for the ball to use, so a ball can import Office Core the use of four, so that the valve 4 times longer life.
5, to change the valve structure to improve life expectancy
Ceramic control valve using the first two structures, in order to more rational structure of the valve, into the now commonly used 3-type structure, such a structure because of its dual-seat, it also has the characteristics of a double seal. At the same time, ceramic ball valve in the selection of choice when the attention of the transition slope of valve design, this valve can reduce the impact of fluid.
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Briefly introduce the multi-function control valve pumps the technical requirements of (a)
Nominal pressure which is applicable for PN1.0MPa-PN4.0MPa, DN DN50mm-DN1200mm for multi-functional water pump control valve.
The technical requirements of the standard as follows:
1. The pressure - temperature degree-level
Multifunctional Pump Control Valve pressure - temperature rating by a shell, with pieces of material and controlling the pressure control system - to determine the temperature level. Multifunctional Pump Control Valve in a temperature from the maximum allowable working pressure shell, with pieces of material and control system in the temperature value of the maximum allowable working pressure of small value.
Iron shell of the pressure - temperature rating shall be in accordance with the provisions of GB/T17241.7.
Steel shell of the pressure - temperature rating shall be in accordance with the provisions of GB/T9124.
For GB/T17241.7, GB/T9124 did not provide the pressure - temperature rating of the materials, according to the relevant standards or design requirements.
2. Valve
Body flange
Flange with the valve body should be cast overall. Iron flange type and size should be in accordance with the provisions of GB/T17241.6, technical conditions should be consistent with the provisions of GB/T17241.7; steel flange of the type and size should be in accordance with the provisions of GB/T9113.1, technical conditions should be in accordance with the provisions of GB/T9124.
3. Tectorial membrane valve seat chip
Block valve cover and the diaphragm, diaphragm and valve seat connections Flanged type should be used.
Diaphragm valve seat and the number of connection bolts shall not be less than 4.
Block diaphragm valve cover and the minimum wall thickness in accordance with the requirements of 2.3.
Block diaphragm valve cover and the flange should be rounded. Flange type sealing surface may be flat, or convex surface process-type.
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The technical requirements of the standard as follows:
1. The pressure - temperature degree-level
Multifunctional Pump Control Valve pressure - temperature rating by a shell, with pieces of material and controlling the pressure control system - to determine the temperature level. Multifunctional Pump Control Valve in a temperature from the maximum allowable working pressure shell, with pieces of material and control system in the temperature value of the maximum allowable working pressure of small value.
Iron shell of the pressure - temperature rating shall be in accordance with the provisions of GB/T17241.7.
Steel shell of the pressure - temperature rating shall be in accordance with the provisions of GB/T9124.
For GB/T17241.7, GB/T9124 did not provide the pressure - temperature rating of the materials, according to the relevant standards or design requirements.
2. Valve
Body flange
Flange with the valve body should be cast overall. Iron flange type and size should be in accordance with the provisions of GB/T17241.6, technical conditions should be consistent with the provisions of GB/T17241.7; steel flange of the type and size should be in accordance with the provisions of GB/T9113.1, technical conditions should be in accordance with the provisions of GB/T9124.
3. Tectorial membrane valve seat chip
Block valve cover and the diaphragm, diaphragm and valve seat connections Flanged type should be used.
Diaphragm valve seat and the number of connection bolts shall not be less than 4.
Block diaphragm valve cover and the minimum wall thickness in accordance with the requirements of 2.3.
Block diaphragm valve cover and the flange should be rounded. Flange type sealing surface may be flat, or convex surface process-type.
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Install thermostatic valve adjustment to achieve energy-efficient a way as to return the best
In the single-family gas furnace heating system, if there is no heating temperature control valve, when the little stove, all of the heating are hot, the user can only adjust the water temperature on the furnace and the furnace start-stop setting. But also has a temperature control valve can be used not only the product itself free heat (such as electrical heat, the body heat, solar energy, etc.) energy-saving, more importantly, there is now a temperature control valve, the user can sub-room temperature control, select the heating .
We have a floor area of 89m2 of Ershiyiting a Methodist home, five groups of different heating the house situation, and so the experiment. Only big lie in this Unit Chaoyang. Stove water temperature set at 4 file (about 60 ℃ or so), outdoor temperature is 0-10 ℃ about family day was simulated experimental results are as follows:
Case 1: There is no temperature control valve, the room temperature maintained at around 20 ℃
The average gas consumption of 0.57m3 / h. 120 days per heating season, gas fee is 1.7 yuan / m3, at a cost of 0.57x24 hours x120 days x1.7 = 2790.72 Yuan. Comprehensive consideration cold weather gas consumption increase, sometimes longer heating period, water temperature may be set higher, and the user may not be all day with hot, etc., in which case a heating period, heating costs should be 2,500 yuan -- about 3,000 yuan, or 28 yuan / m2-34 Yuan / m2, compared with the high cost of central heating.
Case 2: with Gan Poor temperature control valve, all the temperature control valve settings put three, that is, the room temperature about 20 ℃
The average gas consumption of 0.42m3 / h. A heating period at a cost of 0.42x24 hours x120 days x1.7 = 2056.32 Yuan. Comprehensive consideration, in which case the cost of a heating period should be around 1,700 yuan -2,300 yuan, or 19.1 yuan / m2-25.8 Yuan / m2, and the central heating costs are considerable. Compared with the situation of an energy saving about 25%. This energy is entirely caused by the product itself.
Case 3: Gan Poor temperature control valve is equipped with daytime living room temperature control valve set at 20 ℃ (scale 3), the evening set at 8 ℃ (scale *); large horizontal temperature control valve set at 20 ℃ ( scale 3), daytime set at 12 ℃ (scale 1); a small horizontal temperature control valve set at 20 ℃ (scale 3), daytime set at 6 ℃ (scale *); the temperature control valve toilets and toilet-wide days set at 6 ℃ (scale *) Average air consumption 0.28m3 / h. A heating period at a cost of 0.28x24 hours x120 days x1.7 = 1370.88 Yuan. Comprehensive consideration, in which case the cost of a heating period should be around 1,100 yuan -1,500 yuan, or 12.4 yuan / m2-16.9 Yuan / m2, lower than the cost of central heating. Compared with the situation of an energy saving about 50%. This energy is the product itself and the user's own actions brought about.
The absence of thermostatic valve system transformation, 5 temperature control valve to only invest in 1000-1200 yuan, a year to recover the investment, reform is also very easy.
The best adjustment method using the temperature control valve
1) Long-term unoccupied rooms and kitchen, bathroom and other places: the temperature setting to 6 ℃ (scale *), right and up and down the room's heating system for frost protection of water systems can be.
2) For the resident's bedroom: daytime temperature setting to 12 ℃ -30 ℃ (scale 1-3 between the virtue of each specific sense of setting may be), to guarantee a certain room temperature, so as not at night into the room, room temperature is too low, affecting comfort. Before going to sleep time, set at 20 ℃ (scale 3), sleep set at 16 ℃ (scale 2), because people go to bed at night covered with blankets, the room temperature should not be too high.
3) For the living room: the day the temperature set to 20 ℃ (scale 3), night may be set at 16 ℃ (scale 2).
For office workers, is not recommended to go to work after the shutdown. Because the shutdown, the room temperature would drop more common. Point furnace after work, the room temperature if necessary up to 20 ℃ for several hours, but can not even save money. For families with infants and the elderly, some room temperature need to be set at around 24 ℃ (scale 4), when the water temperature of the stove to set the need to increase to around 80 ℃, or room temperature may not go up.
The use of gas-fired furnace heating Attention
For the central heating users, your home is only the end of heating, as long as heating does not leak, you Needless to worry about other things. Even if your house unoccupied during the winter, your home heating is also usual heating, protection system and the upper and lower the water will not be damaged by frost. The gas furnace user is different, the entire heating system from the heat source to the end-all in the home, can be described as small but fully-equipped one. For not heating the whole by the user own control. Is therefore most important is that if your house unoccupied during the winter, then do not forget you still need to heat the room, or home heating system and water system piping has been up and down the danger of Frost Crack. Buried pipelines are basically now, once the pipeline damaged by frost and repair damage on the ground when you need to bring the loss should not be underestimated. So for this situation, if you are only short-term leave home, just when you leave home all of the temperature control valve located at 6 ℃ (scale *), gas furnace set at the low water temperature about 35 ℃; if do not live long in the winter, please have a friend or the property will be up and running on your system, so that not only spend less, while protecting the system.
In such a heating system at their own expense, the most appropriate to install heating cover. Because doing so would reduce the amount of heating of the heat. Compared with the next installation of heating, to achieve the same room temperature, the user must spend more this effect will be more than 30% of the money. At the same time in the selection thermostatic valve, we must pay attention to product quality, as some low-grade temperature control valve 2-5 years after the use of the role will lose temperature.
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We have a floor area of 89m2 of Ershiyiting a Methodist home, five groups of different heating the house situation, and so the experiment. Only big lie in this Unit Chaoyang. Stove water temperature set at 4 file (about 60 ℃ or so), outdoor temperature is 0-10 ℃ about family day was simulated experimental results are as follows:
Case 1: There is no temperature control valve, the room temperature maintained at around 20 ℃
The average gas consumption of 0.57m3 / h. 120 days per heating season, gas fee is 1.7 yuan / m3, at a cost of 0.57x24 hours x120 days x1.7 = 2790.72 Yuan. Comprehensive consideration cold weather gas consumption increase, sometimes longer heating period, water temperature may be set higher, and the user may not be all day with hot, etc., in which case a heating period, heating costs should be 2,500 yuan -- about 3,000 yuan, or 28 yuan / m2-34 Yuan / m2, compared with the high cost of central heating.
Case 2: with Gan Poor temperature control valve, all the temperature control valve settings put three, that is, the room temperature about 20 ℃
The average gas consumption of 0.42m3 / h. A heating period at a cost of 0.42x24 hours x120 days x1.7 = 2056.32 Yuan. Comprehensive consideration, in which case the cost of a heating period should be around 1,700 yuan -2,300 yuan, or 19.1 yuan / m2-25.8 Yuan / m2, and the central heating costs are considerable. Compared with the situation of an energy saving about 25%. This energy is entirely caused by the product itself.
Case 3: Gan Poor temperature control valve is equipped with daytime living room temperature control valve set at 20 ℃ (scale 3), the evening set at 8 ℃ (scale *); large horizontal temperature control valve set at 20 ℃ ( scale 3), daytime set at 12 ℃ (scale 1); a small horizontal temperature control valve set at 20 ℃ (scale 3), daytime set at 6 ℃ (scale *); the temperature control valve toilets and toilet-wide days set at 6 ℃ (scale *) Average air consumption 0.28m3 / h. A heating period at a cost of 0.28x24 hours x120 days x1.7 = 1370.88 Yuan. Comprehensive consideration, in which case the cost of a heating period should be around 1,100 yuan -1,500 yuan, or 12.4 yuan / m2-16.9 Yuan / m2, lower than the cost of central heating. Compared with the situation of an energy saving about 50%. This energy is the product itself and the user's own actions brought about.
The absence of thermostatic valve system transformation, 5 temperature control valve to only invest in 1000-1200 yuan, a year to recover the investment, reform is also very easy.
The best adjustment method using the temperature control valve
1) Long-term unoccupied rooms and kitchen, bathroom and other places: the temperature setting to 6 ℃ (scale *), right and up and down the room's heating system for frost protection of water systems can be.
2) For the resident's bedroom: daytime temperature setting to 12 ℃ -30 ℃ (scale 1-3 between the virtue of each specific sense of setting may be), to guarantee a certain room temperature, so as not at night into the room, room temperature is too low, affecting comfort. Before going to sleep time, set at 20 ℃ (scale 3), sleep set at 16 ℃ (scale 2), because people go to bed at night covered with blankets, the room temperature should not be too high.
3) For the living room: the day the temperature set to 20 ℃ (scale 3), night may be set at 16 ℃ (scale 2).
For office workers, is not recommended to go to work after the shutdown. Because the shutdown, the room temperature would drop more common. Point furnace after work, the room temperature if necessary up to 20 ℃ for several hours, but can not even save money. For families with infants and the elderly, some room temperature need to be set at around 24 ℃ (scale 4), when the water temperature of the stove to set the need to increase to around 80 ℃, or room temperature may not go up.
The use of gas-fired furnace heating Attention
For the central heating users, your home is only the end of heating, as long as heating does not leak, you Needless to worry about other things. Even if your house unoccupied during the winter, your home heating is also usual heating, protection system and the upper and lower the water will not be damaged by frost. The gas furnace user is different, the entire heating system from the heat source to the end-all in the home, can be described as small but fully-equipped one. For not heating the whole by the user own control. Is therefore most important is that if your house unoccupied during the winter, then do not forget you still need to heat the room, or home heating system and water system piping has been up and down the danger of Frost Crack. Buried pipelines are basically now, once the pipeline damaged by frost and repair damage on the ground when you need to bring the loss should not be underestimated. So for this situation, if you are only short-term leave home, just when you leave home all of the temperature control valve located at 6 ℃ (scale *), gas furnace set at the low water temperature about 35 ℃; if do not live long in the winter, please have a friend or the property will be up and running on your system, so that not only spend less, while protecting the system.
In such a heating system at their own expense, the most appropriate to install heating cover. Because doing so would reduce the amount of heating of the heat. Compared with the next installation of heating, to achieve the same room temperature, the user must spend more this effect will be more than 30% of the money. At the same time in the selection thermostatic valve, we must pay attention to product quality, as some low-grade temperature control valve 2-5 years after the use of the role will lose temperature.
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Saturday, March 5, 2011
Solenoid valve and the structure of knowledge of the Selection Principle (a)
I: the applicability of
The fluid lines must be selected solenoid valve calibration model in the same medium.
Fluid temperature must be less than the selected temperature calibration solenoid valve.
Solenoid valve to allow liquid viscosity 20CST generally less than 20CST should be specified.
Working pressure, maximum pressure pipeline should be chosen in less than 0.04MPa as ZS, 2W, ZQDF, ZCM Series such as moving straight and direct step-by-step type; minimum working pressure can be selected when more than 0.04MPa Pilot - (pressure type) electromagnetic valve; maximum working pressure solenoid valve should be less than the maximum calibration pressure; generally are one-way solenoid valve, so pay attention to whether there is anti-pressure, if the installation of a non-return valve.
Fluid cleanliness is not high in the solenoid valve should be installed before the filter, the general electromagnetic
Valve cleanliness requirements of the media better.
Attention to flow and take over the aperture diameter; solenoid valve generally only two control switches; conditions permit, please install the bypass pipe, to facilitate maintenance; the phenomenon of water hammer when the solenoid valve to customize the opening and closing time to adjust.
Environmental temperature on the impact of the electromagnetic valve
And consumption of power supply current output capacity should be based on selection, the general allows the supply voltage of about ± 10%, it is important to start the exchange of high value when the VA.
Second, the reliability of
Normally closed solenoid valve is divided into two kinds of open and regular; general selection-type normally closed, power open, power closed; but in a very long time to open a very short time to close the normally open type of selection.
Life test, factories are generally the type of pilot projects, specifically in our country has not the professional standard of solenoid valve, solenoid valve manufacturers, therefore, when chosen carefully.
Moves a short period of time generally select high frequency straight type, the rapid series of large-caliber selection.
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The fluid lines must be selected solenoid valve calibration model in the same medium.
Fluid temperature must be less than the selected temperature calibration solenoid valve.
Solenoid valve to allow liquid viscosity 20CST generally less than 20CST should be specified.
Working pressure, maximum pressure pipeline should be chosen in less than 0.04MPa as ZS, 2W, ZQDF, ZCM Series such as moving straight and direct step-by-step type; minimum working pressure can be selected when more than 0.04MPa Pilot - (pressure type) electromagnetic valve; maximum working pressure solenoid valve should be less than the maximum calibration pressure; generally are one-way solenoid valve, so pay attention to whether there is anti-pressure, if the installation of a non-return valve.
Fluid cleanliness is not high in the solenoid valve should be installed before the filter, the general electromagnetic
Valve cleanliness requirements of the media better.
Attention to flow and take over the aperture diameter; solenoid valve generally only two control switches; conditions permit, please install the bypass pipe, to facilitate maintenance; the phenomenon of water hammer when the solenoid valve to customize the opening and closing time to adjust.
Environmental temperature on the impact of the electromagnetic valve
And consumption of power supply current output capacity should be based on selection, the general allows the supply voltage of about ± 10%, it is important to start the exchange of high value when the VA.
Second, the reliability of
Normally closed solenoid valve is divided into two kinds of open and regular; general selection-type normally closed, power open, power closed; but in a very long time to open a very short time to close the normally open type of selection.
Life test, factories are generally the type of pilot projects, specifically in our country has not the professional standard of solenoid valve, solenoid valve manufacturers, therefore, when chosen carefully.
Moves a short period of time generally select high frequency straight type, the rapid series of large-caliber selection.
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Pneumatic control valve maintenance
Pneumatic control valve is widely used in petroleum chemical industry is one of the instrument. It is precisely to work properly in ensuring the normal operation of process plants and production safety have an important significance. Therefore, strengthening the pneumatic valve repair is necessary.
First, repair parts, when the focus of inspection
Check between the body wall: In high-pressure differential and corrosive media of the occasion, body wall, diaphragm of the diaphragm often media impact and corrosion, we must focus on examination of pressure decay;
Check Seat: Due to the work of media penetration, fixed seat screw used in the inner surface susceptible to corrosion Ershi seat relaxation;
Check spool: spool valve to regulate one of movable parts, subject to more severe erosion of the medium, repair should be careful when you check the valve core ministries is corrosion, wear and tear, especially in the case of high-pressure differential, spool of wear due to cavitation caused by cavitation phenomenon is even more serious. Were seriously damaged valve core should be replaced; check Filler: Check the packing asbestos rope is dry, such as the use of PTFE packing, should pay attention to check whether the aging and its mating surface is damaged;
Check the executive body of the rubber membrane is aging, whether the cracking phenomenon.
2, pneumatic control valve with daily maintenance
When the control valve using graphite asbestos as a filler, the filler should be about three months to add a lubricant to ensure the control valve and flexible easy to use. Found filling pressure cap low, should be added fillers, such as found in the dry filler PTFE B sclerosis, should be promptly replaced; should pay attention to inspection tour of the operation of control valve, check valve position indicator and regulator the output is consistent; to have locator control valve should always check the gas source, identify problems and timely treatment; should always maintain a control valve components of health as well as a complete easy to use.
3, common faults and their causes
(A) the control valve does not move. Phenomenon and the reasons for failure are as follows:
1. No signal, no gas source. ① gas source is not open, ② gas supply due to water freezing in the winter, leading to blocked ducts or filters, valve block failure, ③ compressor failure; ④ source of mains gas leak.
2. There is gas source, no signal. ① regulator failure, ② the signal tube leakage; ③ bellows leak locator; ④ regulate film damaged retina.
3. No gas source locator. ① filter plugging; ② valve failure I ③ pipeline leak or blockage.
4. Positioning device has gas supply, no output. Locator orifice plug.
5. There is signal, no action. Spool off ①, ② spool with the social or stuck with the valve seat; ③ stem bending or breakage; ④ spool seat block of frozen or coke dirt; ⑤ implementing agencies do not have the spring due to the long-term rust die.
(B) the control valve moves instability. Phenomenon and the reasons for failure are as follows:
1. Pressure gas source of instability. ① compressor capacity is too small; ② valve failure.
2. The signal pressure instability. ① control system time constant (T = RC) inappropriate; ② regulator output instability.
3. A stable gas supply pressure, the signal pressure is stable, but still stable valve action. ① Locator amplifier ball wear off by the dirt loose, especially with increasing gas consumption will produce the output shock; ② Locator amplifier nozzle baffle is not parallel to baffle nozzle cover not live; ③ Output Pipe, line leak; ④ executive body rigidity is too small; ⑤ stem movement friction large parts of a block in contact with the phenomenon.
(C) regulating valve vibration. Phenomenon and the reasons for failure are as follows:
1. Regulating valve opening at any vibration at all times. ① supporting instability; ② near the source of vibration; ③ spool and bushing wear serious.
2. Regulating valve near the fully closed position vibration. ① big selection valve, often used in small openings; ② single-seat valve media flow on and off in the opposite direction.
(D) regulating valve movements slow. Slow phenomenon, and the following reasons:
1. Stem only in one direction when the slow movement. ① pneumatic membrane leakage of the implementing agencies in the membrane damage; ② implementing agencies in the "O" type seal leakage.
2. When the stem at reciprocating movements are slow phenomenon. ① valve body with sticky material to plug; ② sclerosis or graphite PTFE packing deterioration of asbestos packing a dry lubricant; ③ packing too tightly increases, friction increases; ④ stem not directly lead to friction due to large; ⑤ No The pneumatic control valve positioner can lead to slow movement.
(E) increase the amount of valve leakage. Leakage of the following reasons:
1. Valve fully closed when the leakage of large quantities. ① spool is worn to a serious internal leakage, ② strictly off valve is not a good tune.
2. Valve fail to fully closed position. ① medium pressure too great, the executing agency rigidity is small, loose valve closed; ② of a foreign body within the valve; ③ sintered bushing.
(F) adjustable flow range becomes smaller. The main reason is corrosion smaller spool, so that the minimum flow rate adjustable larger.
Pneumatic control valve failure to understand the phenomenon and the reasons to be symptomatic to take measures to resolve it.
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First, repair parts, when the focus of inspection
Check between the body wall: In high-pressure differential and corrosive media of the occasion, body wall, diaphragm of the diaphragm often media impact and corrosion, we must focus on examination of pressure decay;
Check Seat: Due to the work of media penetration, fixed seat screw used in the inner surface susceptible to corrosion Ershi seat relaxation;
Check spool: spool valve to regulate one of movable parts, subject to more severe erosion of the medium, repair should be careful when you check the valve core ministries is corrosion, wear and tear, especially in the case of high-pressure differential, spool of wear due to cavitation caused by cavitation phenomenon is even more serious. Were seriously damaged valve core should be replaced; check Filler: Check the packing asbestos rope is dry, such as the use of PTFE packing, should pay attention to check whether the aging and its mating surface is damaged;
Check the executive body of the rubber membrane is aging, whether the cracking phenomenon.
2, pneumatic control valve with daily maintenance
When the control valve using graphite asbestos as a filler, the filler should be about three months to add a lubricant to ensure the control valve and flexible easy to use. Found filling pressure cap low, should be added fillers, such as found in the dry filler PTFE B sclerosis, should be promptly replaced; should pay attention to inspection tour of the operation of control valve, check valve position indicator and regulator the output is consistent; to have locator control valve should always check the gas source, identify problems and timely treatment; should always maintain a control valve components of health as well as a complete easy to use.
3, common faults and their causes
(A) the control valve does not move. Phenomenon and the reasons for failure are as follows:
1. No signal, no gas source. ① gas source is not open, ② gas supply due to water freezing in the winter, leading to blocked ducts or filters, valve block failure, ③ compressor failure; ④ source of mains gas leak.
2. There is gas source, no signal. ① regulator failure, ② the signal tube leakage; ③ bellows leak locator; ④ regulate film damaged retina.
3. No gas source locator. ① filter plugging; ② valve failure I ③ pipeline leak or blockage.
4. Positioning device has gas supply, no output. Locator orifice plug.
5. There is signal, no action. Spool off ①, ② spool with the social or stuck with the valve seat; ③ stem bending or breakage; ④ spool seat block of frozen or coke dirt; ⑤ implementing agencies do not have the spring due to the long-term rust die.
(B) the control valve moves instability. Phenomenon and the reasons for failure are as follows:
1. Pressure gas source of instability. ① compressor capacity is too small; ② valve failure.
2. The signal pressure instability. ① control system time constant (T = RC) inappropriate; ② regulator output instability.
3. A stable gas supply pressure, the signal pressure is stable, but still stable valve action. ① Locator amplifier ball wear off by the dirt loose, especially with increasing gas consumption will produce the output shock; ② Locator amplifier nozzle baffle is not parallel to baffle nozzle cover not live; ③ Output Pipe, line leak; ④ executive body rigidity is too small; ⑤ stem movement friction large parts of a block in contact with the phenomenon.
(C) regulating valve vibration. Phenomenon and the reasons for failure are as follows:
1. Regulating valve opening at any vibration at all times. ① supporting instability; ② near the source of vibration; ③ spool and bushing wear serious.
2. Regulating valve near the fully closed position vibration. ① big selection valve, often used in small openings; ② single-seat valve media flow on and off in the opposite direction.
(D) regulating valve movements slow. Slow phenomenon, and the following reasons:
1. Stem only in one direction when the slow movement. ① pneumatic membrane leakage of the implementing agencies in the membrane damage; ② implementing agencies in the "O" type seal leakage.
2. When the stem at reciprocating movements are slow phenomenon. ① valve body with sticky material to plug; ② sclerosis or graphite PTFE packing deterioration of asbestos packing a dry lubricant; ③ packing too tightly increases, friction increases; ④ stem not directly lead to friction due to large; ⑤ No The pneumatic control valve positioner can lead to slow movement.
(E) increase the amount of valve leakage. Leakage of the following reasons:
1. Valve fully closed when the leakage of large quantities. ① spool is worn to a serious internal leakage, ② strictly off valve is not a good tune.
2. Valve fail to fully closed position. ① medium pressure too great, the executing agency rigidity is small, loose valve closed; ② of a foreign body within the valve; ③ sintered bushing.
(F) adjustable flow range becomes smaller. The main reason is corrosion smaller spool, so that the minimum flow rate adjustable larger.
Pneumatic control valve failure to understand the phenomenon and the reasons to be symptomatic to take measures to resolve it.
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