Metal sealed valves generally higher than those elastic sealing valve long life, but it is difficult to achieve completely sealed. Metal seal can adapt to a higher operating temperature, flexible seal is affected by temperature limit has flaws.
If you require the use of flow control valve as the main choice is the right size and type of valve. Butterfly structure principle is particularly suitable for production of large-diameter valves. Butterfly not only in oil, gas, chemicals, water treatment, etc. are widely used in general industry, but also applied to thermal power plant cooling water systems.
Commonly used in butterfly valves are wafer type butterfly valve and flange type butterfly valve two kinds. Right clip-on butterfly is double-headed bolts to connect the valve between the two pipe flanges, flange type butterfly valve is a valve with a flange on, with bolts at both ends of the valve on the pipe flange connection method Lan on.
Evolved from the stopcock valve. It has the same movement rotated 90 degrees to mention only difference is that cock body is a sphere, a circular through-hole or channel through its axis. The sphere and the ratio of openings should be such that when the ball rotated 90 degrees, in the import and export of office should be fully rendered sphere, thus cutting off the flow.
Just use the rotary valve 90-degree rotation of the operation and a small torque can be closed tightly. The body cavity of full equality for the media to provide a little resistance, through the flow channel. Generally considered the most suitable valve opening and closing done directly used, but the recent development has been designed to give it a throttle valve and control the flow purposes. The main features of valve is its own compact, easy operation and maintenance for water, solvents, acids, and natural gas work in general media, but also applies to poor working conditions of media, such as oxygen, hydrogen peroxide, methane and ethylene and so on. Ball valve can be integral, it can be modular.
Selection of valves to prevent backflow by media
This type of valve is the role of media in one direction only allows movement, but also to prevent the direction of flow. Usually the valve is automatically work, the fluid flow in one direction under pressure, valve flap open; fluid flow in the opposite direction from the fluid pressure and valve flap valve flap from the coincidence of acting on the valve seat and thus cut off the flow. Check them belonging to this type of valve, which includes Swing check valve and lift check valve. Swing Check Valve with ordinary hinge, there is a door the same as the free flap valve leaning tilt seat surface. In order to ensure that the flap valve seat face every time to reach a suitable position, the valve flap design in the hinge body to valve flap has enough to swing space, and make a real flap valve, comprehensive engagement with the valve seat. Valve flap can all be made of metal can also be embedded in the metal on leather, rubber, or synthetic coverage, depending on the use of performance requirements. Swing check valve in the fully open position, the fluid pressure virtually unimpeded, so the pressure drop through the valve is relatively small. Check the valve lift valve is located in the valve body on the valve seat sealing surface. In addition to this valve flap valve is free to lift, the other part of the same as the cut-off valve, the fluid pressure valve from the valve seat sealing surface of valve lift, medium return valve flap led to a seat on the back, and cut off the flow. According to conditions of use, the valve flap can be all-metal structure can also be rack mounted in the valve flap rubber mat or rubber ring form. The same as the cut-off valves, fluid channels through the lift valve is narrow, so that by elevating the pressure drop valve Swing check valve than the bigger, and the flow of Swing Check Valve restrictions on rarely.
Medium parameters chosen by regulating valve
In the production process, in order to make media pressure, flow and other parameters meet the process requirements, need to install the adjusting mechanism to adjust these parameters. Regulating the organization's main working principle is to change the valve by valve flap and valve seat between the flap and the circulation area, to achieve the purpose of regulating the above parameters. Such valves are referred to as control valves, which are divided into relying on power-driven media itself is called self-drive-type control valve such as valves, regulator valve, all leading up power-driven (such as electricity, compressed air and fluid power) as he was driving control valve, such as the electric control valve, pneumatic control valve and hydraulic control valve and so on.
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Saturday, September 18, 2010
HPLC 6-way valve injector use and maintenance instructions
Six-way valve injector is a high performance liquid chromatography system, the ideal injector, which is sealed by a circular pad (rotor) and fixed-base (stator) component. The U.S. company's six-way Rheodyne valve injector of the most common, major manufacturers of HPLC instruments are this product as the instrument into the injector.
How it works:
1, handle-bit sample (Load) position, samples were micro-injection needle from the injection hole injection into the quantitative aspect of quantitative ring filled, the excess sample from the exhaust venting holes;
2, will rotate the handle to the injection (Inject) position, the valve connected with the liquid flow path from the pump delivered the mobile phase washed quantitative aspect of promoting the liquid sample into the analytical column for analysis.
Although the six-way valve injector with a simple structure, easy to use, long life, routine maintenance without the need characteristics, but the correct use and maintenance will be able to increase the service life and protect peripheral equipment, while increasing the analysis accuracy. If used properly, then the six-way valve injector generally continuous nebulization 30000 times without the need for maintenance.
The following six-way valve of the injector of the use and maintenance matters (for reference only)
1, the handle is between Load and Inject, due to a temporary blocking of the flow path, flow path in the pressure surge, and then go into the kind of place, high pressure caused damage to the stigma, it should be as soon as possible turn valves, can not be stay in the middle. In the HPLC system used syringe needles are different from gas chromatography, is a flat head injector. On the one hand, the outer needle injector sealing tube close to the inside, seal performance, no leakage, without introducing air; the other hand, it prevents a needle stab the bad seal components and stator.
2, the six-way valve into the sample injection device fitted methods are part of the solution method and full of liquid and French. France to use part of liquid into the sample, the sample size up to 75% of the volume of quantitative ring, such as the quantitative ring up 20gL sample 15p, L of the sample, and requires an accurate volume of each sample, the same; the use of fully loaded liquid sampling method when the sample size of at least quantitative ring size 3 to 5 times, that is, 20gL quantitative ring 60 to at least sample 1001aL samples, so as to completely replace the sample quantitative ring residual solution, to achieve the required precision degree and reproducibility. Recommended 100ul flat-head injection needle filled with 20ul sample loop.
3, injection volume according to the needs of their own making quantitative ring, generally does not require the accurate calculation of quantitative ring size, for example, a nominal 10gL quantitative ring, is actually 9gL or 1lgL not important, because the tested samples and calibration sample injection volume consistent errors in the calculation of the results have been offset.
4, injection sample particles and energy demands without resistance death of needles and injection valve material, the sample solution were to use 0.45 ~ tm of the membrane filter. To prevent particles blocking injection valve and reduce the wear and tear on injection valves. In order to prevent the buffer salts and other residual materials remain in the injection system, should be washed after each injection device, usually do not saline diluent, water or saline washing mobile phase, in the injection valve Load Inject position, and repeated washing, and then non-fiber paper to wipe the outside of syringe needles. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve ball valve V Type Ball Valve
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How it works:
1, handle-bit sample (Load) position, samples were micro-injection needle from the injection hole injection into the quantitative aspect of quantitative ring filled, the excess sample from the exhaust venting holes;
2, will rotate the handle to the injection (Inject) position, the valve connected with the liquid flow path from the pump delivered the mobile phase washed quantitative aspect of promoting the liquid sample into the analytical column for analysis.
Although the six-way valve injector with a simple structure, easy to use, long life, routine maintenance without the need characteristics, but the correct use and maintenance will be able to increase the service life and protect peripheral equipment, while increasing the analysis accuracy. If used properly, then the six-way valve injector generally continuous nebulization 30000 times without the need for maintenance.
The following six-way valve of the injector of the use and maintenance matters (for reference only)
1, the handle is between Load and Inject, due to a temporary blocking of the flow path, flow path in the pressure surge, and then go into the kind of place, high pressure caused damage to the stigma, it should be as soon as possible turn valves, can not be stay in the middle. In the HPLC system used syringe needles are different from gas chromatography, is a flat head injector. On the one hand, the outer needle injector sealing tube close to the inside, seal performance, no leakage, without introducing air; the other hand, it prevents a needle stab the bad seal components and stator.
2, the six-way valve into the sample injection device fitted methods are part of the solution method and full of liquid and French. France to use part of liquid into the sample, the sample size up to 75% of the volume of quantitative ring, such as the quantitative ring up 20gL sample 15p, L of the sample, and requires an accurate volume of each sample, the same; the use of fully loaded liquid sampling method when the sample size of at least quantitative ring size 3 to 5 times, that is, 20gL quantitative ring 60 to at least sample 1001aL samples, so as to completely replace the sample quantitative ring residual solution, to achieve the required precision degree and reproducibility. Recommended 100ul flat-head injection needle filled with 20ul sample loop.
3, injection volume according to the needs of their own making quantitative ring, generally does not require the accurate calculation of quantitative ring size, for example, a nominal 10gL quantitative ring, is actually 9gL or 1lgL not important, because the tested samples and calibration sample injection volume consistent errors in the calculation of the results have been offset.
4, injection sample particles and energy demands without resistance death of needles and injection valve material, the sample solution were to use 0.45 ~ tm of the membrane filter. To prevent particles blocking injection valve and reduce the wear and tear on injection valves. In order to prevent the buffer salts and other residual materials remain in the injection system, should be washed after each injection device, usually do not saline diluent, water or saline washing mobile phase, in the injection valve Load Inject position, and repeated washing, and then non-fiber paper to wipe the outside of syringe needles. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve ball valve V Type Ball Valve
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Wednesday, September 15, 2010
Bimetallic Steam Traps
Bimetallic steam trap is to trap heat in the structure of the static type of the most solid trap. Its advantages are: afraid of water hammer, high voltage, small size, light weight, not afraid of cold, can be automatically scheduled air, can be installed at any position; back-pressure rate of more than 80%.
The trap for the steam pipes in charge of Road, pipe network tracing, instrument tracing, life there are high-temperature heating and allow the condensation of water heating equipment hydrophobic, the use of a wide range.
Bimetallic steam trap is a bimetal temperature sensing element driving the valve core to switch the valve. When the device just starting when the low-temperature condensed water pipe occurs, double metal film is flat, the spool in the spring in the open position under the elastic. When the condensate water temperature gradually increased, bimetal temperature sensing element began to bend, and to heart valve into the closed position. In the condensate to saturation temperature before the trap completely shut down. Valve is always there before the high-temperature condensation of water, no steam leakage, energy-saving effect is good.
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The trap for the steam pipes in charge of Road, pipe network tracing, instrument tracing, life there are high-temperature heating and allow the condensation of water heating equipment hydrophobic, the use of a wide range.
Bimetallic steam trap is a bimetal temperature sensing element driving the valve core to switch the valve. When the device just starting when the low-temperature condensed water pipe occurs, double metal film is flat, the spool in the spring in the open position under the elastic. When the condensate water temperature gradually increased, bimetal temperature sensing element began to bend, and to heart valve into the closed position. In the condensate to saturation temperature before the trap completely shut down. Valve is always there before the high-temperature condensation of water, no steam leakage, energy-saving effect is good.
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Monday, September 13, 2010
DBB dual relief valve plug the dual-parameter
Model: DBB
Product diameter: DN15-DN300
Product pressure :1.0-6 .4 MPA
Product Material: 304,316,316 L
DBB double dual relief valve plug detail
DBB double plug for double relief valve: aviation kerosene, crude oil, light oil, natural gas, liquefied petroleum gas, pipeline gas, chemicals and other media channels, as the ideal medium cut-off device.
DBB dual relief valve plug double double blockage of the overall exhaust manifold for the primary isolation and is responsible for liquid or gas services. Designed to save weight and installation space, they can in a wide range of materials, sizes and combinations to the head unit to meet all requirements.
Connection:
1. Flange to flange
2, the flange of the screw
3, thread on thread 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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Product diameter: DN15-DN300
Product pressure :1.0-6 .4 MPA
Product Material: 304,316,316 L
DBB double dual relief valve plug detail
DBB double plug for double relief valve: aviation kerosene, crude oil, light oil, natural gas, liquefied petroleum gas, pipeline gas, chemicals and other media channels, as the ideal medium cut-off device.
DBB dual relief valve plug double double blockage of the overall exhaust manifold for the primary isolation and is responsible for liquid or gas services. Designed to save weight and installation space, they can in a wide range of materials, sizes and combinations to the head unit to meet all requirements.
Connection:
1. Flange to flange
2, the flange of the screw
3, thread on thread 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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Thursday, September 9, 2010
V-ball valve adjustment parameters
Model: Qv347H-16C Qv347Y-16P
Product Diameter: 40 ~ 1000mm
Product pressure: 1.6MPa
Product Material: stainless steel casting
Ball valve V-regulation details
◆ product use
Ball valve V-regulation as a result of the ball with the V-core structure, with the shearing of the valve seat. It is applied to paper making, chemical industry, metallurgical industry contains small solid particles or fibers of the suspension medium on the control of process parameters, especially for pulp, paper pulp production processes, white, black liquor , white liquid, such as suspended particles and the concentration of the fluid, turbid fluid medium paste the automatic adjustment
◆ Features
1, a flexible load to guarantee the pressure-assisted sealing seat and ball valve seat since the hard core in close contact to the end
2, with the overall style of the body structure, there is no possibility of leakage potential
3, the percentage with such characteristics, there is a wide range of control and stability control in particular, can be widely used in a variety of process
4, stem and ball core using involute spline connection, when the loaded tooth profile, the teeth have a radial force can play the role of auto-centering and uniformity of the teeth to force the high-intensity, long life
◆ Model performance parameters Qv347H-16C Qv347Y-16P
Working pressure (MPa) 1.6
The application of temperature (℃) -29 ~ 180 -29 ~ 425
Control the application of medium paper pulp, sewage, solid and with small solid particles
Steel casting steel casting stainless steel materials
Chromium stainless steel stem
Sealing surface of chromium carbide steel reactor
Flexible graphite packing 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
Product Diameter: 40 ~ 1000mm
Product pressure: 1.6MPa
Product Material: stainless steel casting
Ball valve V-regulation details
◆ product use
Ball valve V-regulation as a result of the ball with the V-core structure, with the shearing of the valve seat. It is applied to paper making, chemical industry, metallurgical industry contains small solid particles or fibers of the suspension medium on the control of process parameters, especially for pulp, paper pulp production processes, white, black liquor , white liquid, such as suspended particles and the concentration of the fluid, turbid fluid medium paste the automatic adjustment
◆ Features
1, a flexible load to guarantee the pressure-assisted sealing seat and ball valve seat since the hard core in close contact to the end
2, with the overall style of the body structure, there is no possibility of leakage potential
3, the percentage with such characteristics, there is a wide range of control and stability control in particular, can be widely used in a variety of process
4, stem and ball core using involute spline connection, when the loaded tooth profile, the teeth have a radial force can play the role of auto-centering and uniformity of the teeth to force the high-intensity, long life
◆ Model performance parameters Qv347H-16C Qv347Y-16P
Working pressure (MPa) 1.6
The application of temperature (℃) -29 ~ 180 -29 ~ 425
Control the application of medium paper pulp, sewage, solid and with small solid particles
Steel casting steel casting stainless steel materials
Chromium stainless steel stem
Sealing surface of chromium carbide steel reactor
Flexible graphite packing 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
How to solve the small problems common valve
1, why is a small two-seater valve opening hours of work likely oscillation? Pairs of single-core, when the medium is open-type flow, the valve stability; when the medium is a closed-type flow, the valve of the stability of the difference. There are two spool valve seat, the next spool in the flow of closed, open on the spool in the flow, so that a small opening in the work, the flow of closed-type valve spool is easy to cause vibration, which is two-seat valve can not be used for the work of a small opening reason.
2, why double-sealing valve as a shut-off valves can not be used? Two-seat valve spool force balance the advantages of the structure, allowing large differential pressure, and its obvious drawback is that two sealing surface can not be good contacts at the same time, resulting in large leakage. If it is artificially Mandatory used to cut off occasion, apparently ineffective, even if it made a lot of improvements (such as the double-sealed sleeve valve), is also undesirable.
3, what straight poor performance, aiming to halt the stroke control valve, angle valve, prevent the travel of good performance? Direct travel is vertical throttle valve spool, while the medium is the level of flow into the outflow valve cavity flow channel bound to turn down Shui Po, so that the valve flow path becomes quite complex (shape such as the inverted "S" type). In this way, there are many dead zone, the precipitation of the medium provides a space for the long run, causing blockage. The direction of travel throttle valve angle is the horizontal direction, the level of flows into the medium, the level of outflow, easy to clean media is not removed, flow path at the same time simple and very little room for medium precipitation, therefore, prevent the valve angle stroke of good performance.
4, why do straight stroke adjustment valve stem smaller? It involves a simple mechanical principle: sliding friction, rolling friction small. Trip valve stem straight up and down movement, packing slightly pressed a little, it will stem bag tightly, resulting in a larger backlash. To this end, valve stem is designed to be very small, they often fill a small friction coefficient of PTFE packing, in order to reduce hysteresis, but the resulting problem is that stem thin sent, then the easy to bend, filling a shorter life expectancy. To solve this problem, the best way is to turn valve stem with the brigade, namely, the class trip valve angle, and its stem stroke than the straight stem crude 2 ~ 3 times, and the selection of long-lived graphite packing, valve stem stiffness Well, filling long life, but its friction torque is small, a small hysteresis.
5, why cut off the angle valve pressure class travel more? Angle type valve to cut off travel greater pressure is due to media in the spool or the valve plate force generated by the rotational axis of the torque produced is very small, so it can withstand a greater pressure differential.
6, why the use of desalination water medium rubber lined butterfly valve, lined diaphragm valves and short service life? Desalination of water medium containing low concentration of acid or alkali, they have a greater corrosive to rubber. Rubber showed expansion of corrosion, aging, low intensity, with the rubber lining of the butterfly valve, diaphragm use the results are poor, its essence is caused by corrosion of rubber impatience. After the rubber lining for Diaphragm Valves to improve corrosion resistance of a good Lining diaphragm valves, diaphragm valves of the diaphragm, but lined up and down then stand up to collapse were broken off, resulting in mechanical damage to valves shorter life expectancy. Now the best way to deal with specific water valve, it can use to 5 ~ 8 years.
7, why use a hard shut-off valve should be closed? Shut-off valve required leakage as low as possible, soft-sealing valve leakage is the lowest cut off the effect is good, but not wear and poor reliability. From the leakage volume is small, sealed and reliable double standards, not as hard on the soft sealing off sealing off well. As a full-featured ultra-light control valve, sealing the heap are wear-resistant alloy protection, high reliability, leakage rate of 10-7, has been able to meet the shut-off valve requirements.
8, why sleeve valves instead of a single, two-seat valve does not wish fulfilled? 60 years came sleeve valve, 70 years large-scale use at home and abroad, and 80 years the introduction of the sleeve valve petrochemical plant accounted for a larger proportion of that time, many people think that the sleeve valve can replace a single, two-seat valve , to become the second-generation product. By now, is not the case, single-seat valves, seat valves, sleeve valves have been the same use. This is because the sleeve valve is throttling the form of improved stability and maintenance of better than single-seat valve, but it's weight, aiming to halt and leakage targets with single-seat valve in line, how can it replace the single-seat valve it? So, the only shared use.
9, Why is selection is more important than the calculation? Calculation and selection of comparison, the selection should be much more important, much more complex. Because the calculation is a simple formula, which itself does not lie in the accuracy of the formula, but rather by the given parameters are correct. Selection related to the contents of the large, slightly careless, would lead to selection of properly, not only causes human, material and financial resources to waste, and use the result was unsatisfactory, and has brought a number of user issues, such as reliability, life, running quality.
10, why in the pneumatic valve in the piston executing agencies will be more and more? For the pneumatic valve, the piston executing agencies may make full use of gas supply pressure, the executing agency of the size smaller than the membrane, a greater thrust piston in the O-ring and reliable than the film, so its use will Yuelai more.
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2, why double-sealing valve as a shut-off valves can not be used? Two-seat valve spool force balance the advantages of the structure, allowing large differential pressure, and its obvious drawback is that two sealing surface can not be good contacts at the same time, resulting in large leakage. If it is artificially Mandatory used to cut off occasion, apparently ineffective, even if it made a lot of improvements (such as the double-sealed sleeve valve), is also undesirable.
3, what straight poor performance, aiming to halt the stroke control valve, angle valve, prevent the travel of good performance? Direct travel is vertical throttle valve spool, while the medium is the level of flow into the outflow valve cavity flow channel bound to turn down Shui Po, so that the valve flow path becomes quite complex (shape such as the inverted "S" type). In this way, there are many dead zone, the precipitation of the medium provides a space for the long run, causing blockage. The direction of travel throttle valve angle is the horizontal direction, the level of flows into the medium, the level of outflow, easy to clean media is not removed, flow path at the same time simple and very little room for medium precipitation, therefore, prevent the valve angle stroke of good performance.
4, why do straight stroke adjustment valve stem smaller? It involves a simple mechanical principle: sliding friction, rolling friction small. Trip valve stem straight up and down movement, packing slightly pressed a little, it will stem bag tightly, resulting in a larger backlash. To this end, valve stem is designed to be very small, they often fill a small friction coefficient of PTFE packing, in order to reduce hysteresis, but the resulting problem is that stem thin sent, then the easy to bend, filling a shorter life expectancy. To solve this problem, the best way is to turn valve stem with the brigade, namely, the class trip valve angle, and its stem stroke than the straight stem crude 2 ~ 3 times, and the selection of long-lived graphite packing, valve stem stiffness Well, filling long life, but its friction torque is small, a small hysteresis.
5, why cut off the angle valve pressure class travel more? Angle type valve to cut off travel greater pressure is due to media in the spool or the valve plate force generated by the rotational axis of the torque produced is very small, so it can withstand a greater pressure differential.
6, why the use of desalination water medium rubber lined butterfly valve, lined diaphragm valves and short service life? Desalination of water medium containing low concentration of acid or alkali, they have a greater corrosive to rubber. Rubber showed expansion of corrosion, aging, low intensity, with the rubber lining of the butterfly valve, diaphragm use the results are poor, its essence is caused by corrosion of rubber impatience. After the rubber lining for Diaphragm Valves to improve corrosion resistance of a good Lining diaphragm valves, diaphragm valves of the diaphragm, but lined up and down then stand up to collapse were broken off, resulting in mechanical damage to valves shorter life expectancy. Now the best way to deal with specific water valve, it can use to 5 ~ 8 years.
7, why use a hard shut-off valve should be closed? Shut-off valve required leakage as low as possible, soft-sealing valve leakage is the lowest cut off the effect is good, but not wear and poor reliability. From the leakage volume is small, sealed and reliable double standards, not as hard on the soft sealing off sealing off well. As a full-featured ultra-light control valve, sealing the heap are wear-resistant alloy protection, high reliability, leakage rate of 10-7, has been able to meet the shut-off valve requirements.
8, why sleeve valves instead of a single, two-seat valve does not wish fulfilled? 60 years came sleeve valve, 70 years large-scale use at home and abroad, and 80 years the introduction of the sleeve valve petrochemical plant accounted for a larger proportion of that time, many people think that the sleeve valve can replace a single, two-seat valve , to become the second-generation product. By now, is not the case, single-seat valves, seat valves, sleeve valves have been the same use. This is because the sleeve valve is throttling the form of improved stability and maintenance of better than single-seat valve, but it's weight, aiming to halt and leakage targets with single-seat valve in line, how can it replace the single-seat valve it? So, the only shared use.
9, Why is selection is more important than the calculation? Calculation and selection of comparison, the selection should be much more important, much more complex. Because the calculation is a simple formula, which itself does not lie in the accuracy of the formula, but rather by the given parameters are correct. Selection related to the contents of the large, slightly careless, would lead to selection of properly, not only causes human, material and financial resources to waste, and use the result was unsatisfactory, and has brought a number of user issues, such as reliability, life, running quality.
10, why in the pneumatic valve in the piston executing agencies will be more and more? For the pneumatic valve, the piston executing agencies may make full use of gas supply pressure, the executing agency of the size smaller than the membrane, a greater thrust piston in the O-ring and reliable than the film, so its use will Yuelai more.
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Valve Knowledge: Ball Valve
Ball valves and plug valves belong to the same type of valve, its closing piece is a sphere, the sphere around the center line as a rotary valve to achieve the open, close a valve. Valve in the pipeline is mainly used to do cut, distribution and change the direction of media flow.
Ball is widely used in recent years, a new type of valve, it has the following advantages:
1. Fluid resistance is small, the drag coefficient with the same length of pipe equal.
2. Simple structure, small size and light weight.
3. Close and reliable valve sealing surface material is currently widely used in plastic, sealing well, in the vacuum system has also been widely used.
4. Easy to operate, opening and closing rapidly, from fully open to fully closed as long as the rotation 90 °, to facilitate remote control.
5. Easy maintenance, valve structure is simple, seals are generally activities, and demolition are relatively easy to replace.
6. In the fully open or fully closed, the ball and valve seat sealing surface and the dielectric isolation, medium passed, will not cause the erosion of the valve sealing surface.
7. Wide application and a few millimeters diameter from small to large as a few meters from the high vacuum to high pressure can be applied.
Ball has been widely used in petroleum, chemical, power generation, paper, atomic energy, aviation, rockets and other departments, as well as people's daily life.
Ball valve according to structure can be divided into:
A floating ball valve
The sphere is a floating ball valve in the medium under pressure to produce a certain degree of displacement of the sphere, and pressed in the export side of the sealing surface to ensure that the export side seal.
Floating ball valve of simple structure, good sealing, but the ball to bear the load all the working medium to pass the export ring, so to consider the ring material can withstand the work load of the sphere medium. This structure is widely used in the low-pressure valve.
2, fixed ball valve
The ball valve is fixed, the pressure does not produce after the move. Fixed ball valve comes with a floating valve seat, by the medium pressure, the seat produce movement, so that pressed the ball on the ring to ensure sealing. Usually with the sphere of the upper and lower shaft bearings, operating torque is small, applied to high pressure and large-diameter valve.
In order to reduce torque and increase the operation of valve sealing reliability of the valve seal has emerged in recent years, both in injection pressure between the sealing surface of a special lubricant, to form a layer of film that enhances the tightness, but also reduce operating torque, more suitable for large-diameter high-pressure valve.
3, elastic ball valve
The ball valve is flexible. Ball and valve seat ring are the use of metal materials, sealing pressure than the large, relying on media itself can not seal the pressure has reached the requirements to be imposed by external force. Such valves for high temperature and pressure medium.
Elastic sphere is the sphere wall to open the bottom of an elastic groove, and get flexible. When the closed channel, with the stem of the wedge-shaped head to compress the sphere rose up to open with the valve seat seal. In the sphere before turning loose wedge head, ball the subsequent restoration of the original prototype, so that sphere with a small gap between the valve seat, sealing surface can reduce friction and operating torque.
Valve according to their channel positions can be divided into straight-through processing, three-and right-angle type. After two kinds of ball valves for the distribution media and change the flow of media.
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Ball is widely used in recent years, a new type of valve, it has the following advantages:
1. Fluid resistance is small, the drag coefficient with the same length of pipe equal.
2. Simple structure, small size and light weight.
3. Close and reliable valve sealing surface material is currently widely used in plastic, sealing well, in the vacuum system has also been widely used.
4. Easy to operate, opening and closing rapidly, from fully open to fully closed as long as the rotation 90 °, to facilitate remote control.
5. Easy maintenance, valve structure is simple, seals are generally activities, and demolition are relatively easy to replace.
6. In the fully open or fully closed, the ball and valve seat sealing surface and the dielectric isolation, medium passed, will not cause the erosion of the valve sealing surface.
7. Wide application and a few millimeters diameter from small to large as a few meters from the high vacuum to high pressure can be applied.
Ball has been widely used in petroleum, chemical, power generation, paper, atomic energy, aviation, rockets and other departments, as well as people's daily life.
Ball valve according to structure can be divided into:
A floating ball valve
The sphere is a floating ball valve in the medium under pressure to produce a certain degree of displacement of the sphere, and pressed in the export side of the sealing surface to ensure that the export side seal.
Floating ball valve of simple structure, good sealing, but the ball to bear the load all the working medium to pass the export ring, so to consider the ring material can withstand the work load of the sphere medium. This structure is widely used in the low-pressure valve.
2, fixed ball valve
The ball valve is fixed, the pressure does not produce after the move. Fixed ball valve comes with a floating valve seat, by the medium pressure, the seat produce movement, so that pressed the ball on the ring to ensure sealing. Usually with the sphere of the upper and lower shaft bearings, operating torque is small, applied to high pressure and large-diameter valve.
In order to reduce torque and increase the operation of valve sealing reliability of the valve seal has emerged in recent years, both in injection pressure between the sealing surface of a special lubricant, to form a layer of film that enhances the tightness, but also reduce operating torque, more suitable for large-diameter high-pressure valve.
3, elastic ball valve
The ball valve is flexible. Ball and valve seat ring are the use of metal materials, sealing pressure than the large, relying on media itself can not seal the pressure has reached the requirements to be imposed by external force. Such valves for high temperature and pressure medium.
Elastic sphere is the sphere wall to open the bottom of an elastic groove, and get flexible. When the closed channel, with the stem of the wedge-shaped head to compress the sphere rose up to open with the valve seat seal. In the sphere before turning loose wedge head, ball the subsequent restoration of the original prototype, so that sphere with a small gap between the valve seat, sealing surface can reduce friction and operating torque.
Valve according to their channel positions can be divided into straight-through processing, three-and right-angle type. After two kinds of ball valves for the distribution media and change the flow of media.
ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve 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 .
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