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.
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
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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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 b
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