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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Thursday, September 9, 2010
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.
ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve ball valve V Type Ball Valve
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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
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Sunday, August 29, 2010
What is a Self-regulating valve
Self-regulating valve to rely on its own medium flowing through the valve pressure, temperature as an energy-driven valves work automatically and requires no external power supply and the secondary instrument. This Self-regulating valve are making use of valve output feedback signal (pressure, pressure, temperature) through the signal tube passed to the implementing agency-driven valve flap to change the valve opening, to regulate pressure, flow, temperature. This control valve is further divided into direct and indirect effects-action-type two kinds.
Direct-acting type is also known as spring-loaded type, its structure and flexible components, such as springs, corrugated tube, corrugated tube temperature packs, using elastic force and the principle of balance between feedback signal.
Indirect effects of type regulating valve, an increase of a command device (pilot valve) it played the role of the feedback signal amplification and then through the implementing agencies, driving the main valve valve valve movement to achieve the purpose of changing the valve opening.
If the pressure regulator valve, the feedback signal is the valve outlet pressure, the introduction of the implementing agencies through the signal tube.
If the flow control valve, valve outlet there is a plate (or other resistance devices) removed from the pressure plate at both ends of the signal to introduce the implementing agency.
If it is the temperature control valve, valve's exports have temperature sensors (or warm pack) through the temperature sensor of the thermal expansion and contraction within the media-driven executive body. ball valve Trunnion Mounted Ball Valve Floating Ball Valve
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Direct-acting type is also known as spring-loaded type, its structure and flexible components, such as springs, corrugated tube, corrugated tube temperature packs, using elastic force and the principle of balance between feedback signal.
Indirect effects of type regulating valve, an increase of a command device (pilot valve) it played the role of the feedback signal amplification and then through the implementing agencies, driving the main valve valve valve movement to achieve the purpose of changing the valve opening.
If the pressure regulator valve, the feedback signal is the valve outlet pressure, the introduction of the implementing agencies through the signal tube.
If the flow control valve, valve outlet there is a plate (or other resistance devices) removed from the pressure plate at both ends of the signal to introduce the implementing agency.
If it is the temperature control valve, valve's exports have temperature sensors (or warm pack) through the temperature sensor of the thermal expansion and contraction within the media-driven executive body. ball valve Trunnion Mounted Ball Valve Floating Ball Valve
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Wednesday, August 25, 2010
Common valve fault and the elimination of Method
Safety valve failure is mainly due to the design, manufacture, selection or improper use. These failures, if not promptly removed, it will affect valve efficiency and life, not even a security protection. Common faults and eliminate as follows:
(1) leak. In the device under normal operating pressure, valve flap and valve seat sealing surface between the degree of leakage of more than allowed. The reasons are: valve flap and valve seat sealing surface between the dirt. Wrench can be used to enhance the valve is open several times, the dirt washed out; sealing surface damage. Should be based on degree of injury, using grinding or after grinding method of turning to repair; stem bending, tilt lever with the fulcrum, or skewed, so that spool and the valve flap dislocation. Should be re-assembled or replaced; spring elastic lower or no flexibility. Should be taken to replace the spring, re-adjust the opening pressure of other measures.
(2) to the required pressure is not open. The reason for this result is the constant pressure are not allowed. Should re-adjust the amount of compression spring or a heavy hammer position; valve flap and valve seat stick. Should be placed manually on a regular basis on the safety valve for gas or turn on the water test; lever-type safety valve is stuck or heavy hammer, the lever is moved. Should re-adjust the position of the heavy hammer and to leverage campaign freely.
(3) less than the required pressure to open. Is mainly constant pressure are not allowed; spring decline in the aging stretch. Should be properly tightened screw to adjust or replace spring.
(4) The exhaust back pressure continues to rise. This is mainly due to the use of safety equipment, safety valve to vent emissions Xiaoping contribution, should be re-select the appropriate safety valve; stem rust midline errors or spring, so that valve flap can not be opened to the proper height, should be re-assembled stem or replace the spring; the exhaust pipe cut-off there is not enough, should be taken to comply with the safety area of the exhaust pipe emissions.
(5) The valve flap jump frequency or vibration. Was mainly due to large spring stiffness. Should be replaced by an appropriate spring stiffness; adjustment ring to adjust properly, so that the pressure is too high back seat. Should re-adjust the adjustment ring position; discharge piping resistance is too large, resulting in excessive emissions of back pressure. Should reduce the emission of piping resistance.
(6) The discharge does not return after the flap valve seat. This is mainly spring curved stem, valve installation position is not correct or stuck valve caused. Should be re-assembled.
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(1) leak. In the device under normal operating pressure, valve flap and valve seat sealing surface between the degree of leakage of more than allowed. The reasons are: valve flap and valve seat sealing surface between the dirt. Wrench can be used to enhance the valve is open several times, the dirt washed out; sealing surface damage. Should be based on degree of injury, using grinding or after grinding method of turning to repair; stem bending, tilt lever with the fulcrum, or skewed, so that spool and the valve flap dislocation. Should be re-assembled or replaced; spring elastic lower or no flexibility. Should be taken to replace the spring, re-adjust the opening pressure of other measures.
(2) to the required pressure is not open. The reason for this result is the constant pressure are not allowed. Should re-adjust the amount of compression spring or a heavy hammer position; valve flap and valve seat stick. Should be placed manually on a regular basis on the safety valve for gas or turn on the water test; lever-type safety valve is stuck or heavy hammer, the lever is moved. Should re-adjust the position of the heavy hammer and to leverage campaign freely.
(3) less than the required pressure to open. Is mainly constant pressure are not allowed; spring decline in the aging stretch. Should be properly tightened screw to adjust or replace spring.
(4) The exhaust back pressure continues to rise. This is mainly due to the use of safety equipment, safety valve to vent emissions Xiaoping contribution, should be re-select the appropriate safety valve; stem rust midline errors or spring, so that valve flap can not be opened to the proper height, should be re-assembled stem or replace the spring; the exhaust pipe cut-off there is not enough, should be taken to comply with the safety area of the exhaust pipe emissions.
(5) The valve flap jump frequency or vibration. Was mainly due to large spring stiffness. Should be replaced by an appropriate spring stiffness; adjustment ring to adjust properly, so that the pressure is too high back seat. Should re-adjust the adjustment ring position; discharge piping resistance is too large, resulting in excessive emissions of back pressure. Should reduce the emission of piping resistance.
(6) The discharge does not return after the flap valve seat. This is mainly spring curved stem, valve installation position is not correct or stuck valve caused. Should be re-assembled.
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Monday, August 23, 2010
Development of 200-inch ROPO Germany 5 m in diameter, the largest butterfly valve
July 7, 2008, the German company to produce ROPO and work through the company from top to bottom, 200-inch butterfly valve assembly qualified success. This valve is not only the success of the company so far the largest butterfly valve assembly qualified, is their biggest-ever production of valves, valve industry in China reached the most butterfly valve, the valve also marks the company's manufacturing has been on the a new stage, China is more of a major machinery and equipment has contributed to their own. Butterfly valve for the Russian oil export pipeline valve, the valve of about 60 tons weight.
ROPO company in the manufacture of this large valve specification process, issued from the task, the close follow-up on and do all the technical, equipment related to preparations for testing the strict control of the Ministry of precision machining parts, while the manufacturing sector arrangements are equipped with the experience of workers in assembly, to ensure that the valve assembly requirements.
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Dynamic flow balance valve performance
In the air-conditioning and heating system, water system, as energy transmission and distribution of water balance is very important. A balanced hydraulic system is to meet user needs, saving energy consumption basis.
In the air-conditioning and heating systems, cold (hot)-borne transmission and distribution pipeline system from the closed to the consumers. For a well-designed systems, and all users at the end valve (electronic control valve, temperature control valve, etc.) is 100% opening should have access to the design of water, while the various users at the end of the opening control valve to change the when you can get the required flow again without disturbing each other. This water system is a hydraulic balancing system, otherwise unbalanced hydraulic systems, hydraulic imbalance also known as hydraulic imbalance.
Hydraulic imbalance is generally divided into two kinds of static imbalance and dynamic imbalance. The so-called static disorder, also known as steady-state offset. The system, each user in the design of state, does not match the actual flow and design flow. This hydraulic imbalance is fundamental, if not addressed, the impact will remain. For constant flow systems, this imbalance can be static or dynamic balance valve balancing valve to solve, the difference is that the former need to use instruments to regulate, while the latter do not need to. The so-called dynamic disorder also known as the stability of the disorder. The system, some users of the water flow when the change (closed or adjustable), the resistance distribution will cause the system to change, leading to the flow of other users with the changes. This imbalance is random changes in hydraulic and dynamic. Static balance valve can not resolve this imbalance can only be resolved using dynamic balancing valve.
For example: for the six floors of a building, without installation of dynamic flow balance valve, then the water system in actual operation, dynamically disorders. In the air-conditioning cooling season, the first ~ second floor of the room would be too cold, three ~ four comfortable rooms just to meet the design temperature of 5 ~ six layers of the room is too hot. On the contrary, in the heating season, the first ~ second floor of the room would be too hot, the three ~ four comfortable rooms just to meet the design temperature of 5 ~ six layers of the room is too cold. After the installation of dynamic flow balance valve, whether it is a ~ six-room all to use, or only some of the rooms in the use of air-conditioned, all rooms can meet the design temperature.
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In the air-conditioning and heating systems, cold (hot)-borne transmission and distribution pipeline system from the closed to the consumers. For a well-designed systems, and all users at the end valve (electronic control valve, temperature control valve, etc.) is 100% opening should have access to the design of water, while the various users at the end of the opening control valve to change the when you can get the required flow again without disturbing each other. This water system is a hydraulic balancing system, otherwise unbalanced hydraulic systems, hydraulic imbalance also known as hydraulic imbalance.
Hydraulic imbalance is generally divided into two kinds of static imbalance and dynamic imbalance. The so-called static disorder, also known as steady-state offset. The system, each user in the design of state, does not match the actual flow and design flow. This hydraulic imbalance is fundamental, if not addressed, the impact will remain. For constant flow systems, this imbalance can be static or dynamic balance valve balancing valve to solve, the difference is that the former need to use instruments to regulate, while the latter do not need to. The so-called dynamic disorder also known as the stability of the disorder. The system, some users of the water flow when the change (closed or adjustable), the resistance distribution will cause the system to change, leading to the flow of other users with the changes. This imbalance is random changes in hydraulic and dynamic. Static balance valve can not resolve this imbalance can only be resolved using dynamic balancing valve.
For example: for the six floors of a building, without installation of dynamic flow balance valve, then the water system in actual operation, dynamically disorders. In the air-conditioning cooling season, the first ~ second floor of the room would be too cold, three ~ four comfortable rooms just to meet the design temperature of 5 ~ six layers of the room is too hot. On the contrary, in the heating season, the first ~ second floor of the room would be too hot, the three ~ four comfortable rooms just to meet the design temperature of 5 ~ six layers of the room is too cold. After the installation of dynamic flow balance valve, whether it is a ~ six-room all to use, or only some of the rooms in the use of air-conditioned, all rooms can meet the design temperature.
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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Saturday, August 21, 2010
Valve products to the market trends showing a five
Distribution on the valve market are based mainly on the construction project, the largest user of the valve is the petrochemical industry, power sector, metallurgy sector, the chemical industry and urban construction departments. The main application of the petrochemical industry API standard valve, the globe valve and check valve; the electricity sector with the main power plant using high temperature pressure valve, the cut-off valve, check valve and safety valve and water supply and drainage part of the low pressure valve butterfly valve, gate valve; the chemical industry mainly uses stainless steel valve, stop valve, check valve; metallurgical industry mainly uses low-voltage large-diameter butterfly valve, oxygen valve and ball valve oxygen; urban construction department used mainly low-pressure valve, such as urban water use of large diameter pipe major gateway valve, put the construction of the main floor, the use of the center line butterfly valve, the main city of heating metal sealed butterfly valve; pipeline mainly flat gate valve and ball valve; the pharmaceutical industry mainly uses stainless steel ball valve; the food industry mainly uses stainless steel ball valve and so on.
Valve products on the market trends, according to analysis, the main trends in the coming period as follows:
1. With the development of oil fields to the mainland and the transfer of offshore oil field, as well as the electric power industry from below 300,000 kilowatts of thermal power to more than 300,000 kilowatts of thermal power and hydropower and nuclear power development, and valve products should also be based on changes in the field of device applications change its properties and the corresponding parameters.
2. Urban systems generally use a large number of low-pressure valve, and to environmental protection and development of energy-saving, that is, by the use of low pressure over the last steel valve towards environment-friendly plastic valve, balance valve, metal sealed butterfly valve butterfly valve and seal the center line of transition . Oil and gas pipeline projects to the direction of development, which in turn requires a large amount of flat gate valve and ball valve.
3. The other side of energy development is energy conservation, so to see from the conservation of energy, the development of the steam trap to the sub-critical and supercritical parameters of the development of the high.
4. The construction of power plants to large-scale development, it required large-caliber and high-pressure safety valve and pressure relief valve, but also need fast hoist valve.
5. Need to complete the project, the supply valve by a single species to multiple species and the development of multi-specifications. A valve for the project, by a valve manufacturer to provide all of the trend is growing.
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Valve products on the market trends, according to analysis, the main trends in the coming period as follows:
1. With the development of oil fields to the mainland and the transfer of offshore oil field, as well as the electric power industry from below 300,000 kilowatts of thermal power to more than 300,000 kilowatts of thermal power and hydropower and nuclear power development, and valve products should also be based on changes in the field of device applications change its properties and the corresponding parameters.
2. Urban systems generally use a large number of low-pressure valve, and to environmental protection and development of energy-saving, that is, by the use of low pressure over the last steel valve towards environment-friendly plastic valve, balance valve, metal sealed butterfly valve butterfly valve and seal the center line of transition . Oil and gas pipeline projects to the direction of development, which in turn requires a large amount of flat gate valve and ball valve.
3. The other side of energy development is energy conservation, so to see from the conservation of energy, the development of the steam trap to the sub-critical and supercritical parameters of the development of the high.
4. The construction of power plants to large-scale development, it required large-caliber and high-pressure safety valve and pressure relief valve, but also need fast hoist valve.
5. Need to complete the project, the supply valve by a single species to multiple species and the development of multi-specifications. A valve for the project, by a valve manufacturer to provide all of the trend is growing.
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
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