Control valves as the implementation of components in the process industry has always been the production process plays an important role in the performance of control valves directly affect the production process and the failure rate, and even normal production. With the process technology and control technology, process industry growing large economies of scale, and increasing processing capacity, so that the valve performance, even if a small percentage, but also a lot of revenue. Based on this situation, flow control valves for the industry are rising ever higher, coupled with the advantages of rotary valve itself, which makes rotating valve of the valve than the traditional access to more and more applications.
The characteristics of a rotary valve
Valves are usually divided into straight and rotary program two broad categories. Straight trip through a linear motion valve components such as the gate to allow or cut off the logistics. Linear programs have cut-off valve valve, gate valve, valve and so on. Rotary valve through a rotation of the components to allow or cut off the logistics. Rotating parts can rotate 90 degrees is called the Rotary Valve 1 / 4 Rotary Valve. Sometimes 1 / 4 rotary valve can be extended to the classification of less than 270 degrees angle of spin valve. By definition can see through the spin valve is a rotating baffle rotating components such as rotary valve 90 degrees so that the changes from the open spaces to place the rotating valve clearance. Rotary valve has the following general characteristics. (1) adjustable range
Adjustable in the range of process industry is the most critical rotating valve adjustable range of approximately 150:1 (VALTEK range of ball valve can be adjustable 300:1, butterfly valve and adjustable cam deflection range 100:1). The corresponding cut-off valve for the adjustable range of 30:1, meaning that 5 rotary valves can provide a wide adjustable range of times. For example, the maximum flow is 1000 liters / min, closed-type valve can effectively reduce the flow to 30 L / min, while rotating flow valve can be adjusted to less than 10 L / min, the critical flow more precise valve control in the process repeatability of better, and directly reduced the flow of industrial products had failed to pass.
Eccentric rotary valve features two adjustable to increase its scope, the first of its hole plate design, eccentric is an effective 1 / 4 of the park, eccentricity is the V-shaped spool, the spool is a traditional park shape, when the eccentric rotary valve was kept closed, it's smaller V-enabled form in low-flow very precise control of high-volume, it almost with the valve open to almost the same diameter pipe. The second feature is the implementation of the machine rotating valve travel agencies with the implementation of the membrane must visit and the two cylinders. 1 "cut-off valve of the trip is about 3 / 4" ~ 7 / 8 "and rotary valve trip more than two." Any other size of the valve. The greater the input of the trip, the client control in the workplace as possible.
Ratio of high-adjustable control valves provide precise formula required proportion, irrespective of the size of traffic flow path, the traditional linear or regulating valve is no longer adapted to the task, rotating valve device can improve performance while reducing control valve life cycle in the factory in operation costs. Adjustable range of the rotary valve allows the user to close off to improve the standards, thereby enhancing the cost / benefit indicators. Together with the metal valve seat made of special materials with the village to extend the service life of valves to improve valve performance. The rotation of the structure of simple design, can minimize the maintenance workload. Owners to reduce production costs. (2) close to cut off
Straight trip valve stem into and out of the body axis, with each cycle of products, designed for straight trip to avoid leakage is difficult, it will be do not want the product to the production process into the system, and can have a greater unacceptable leakage outside the plant volatile. Rotation of the rotary valve design is essentially the problem does not exist, because such a valve using a low-lag, high thrust-style executive body of the cylinder to provide than other forms of executive body of the stability of a higher more accurate, it can provide long-term metal cut off the valve seat tight. (3) the flow capacity of large-size small
Straight trip the flow valve is installed capacity of the pipeline valve flow capacity of the scores, the ability to improve circulation by increasing the valve size straight trip, usually larger than pipeline. Rotary valve capacity is about the same size valve straight trip for 2 ~ 3 times, spin valve can be used to increase the amount of admixture pipeline without any change in the size of the feed, you can greatly reduce costs, for this reason, some rotary valves have been designed to replace the cut-off valve flange face of the flange connection form, and connected with bolts, such valve replaced by even more than their cut-off valve is also cheaper. (4) anti-cavitation
Expenditure in the process industry can cause a large number of cavitation, cavitation damage to pipelines may produce unacceptable noise levels, while perturbation of the measurement system caused by unclear or unreliable readings, rotating valve design with solid , greatly reducing the water hammer phenomenon as a result of actions caused by the failure of the valve, at the same time part of the valve core can absorb the extra energy, significantly reducing cavitation and related issues. (5) No external leakage
Standard than the standard rotary valve design of the cut-off valve outside the leak than 100 times, the valve stem out of the campaign will be sand dust into the valve in order to damage the graphite filler. Rotating valve stem without any access to the mobile, which makes a rotating movement, so as not to hurt the fill, to avoid external leakage. (6) spare parts and maintenance costs
Block rotary valve metal valve than the cut-off is much less spare parts, maintenance is often easier.
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Sunday, October 3, 2010
The type of valve characteristics and selection of these brief
1. Preface
Valve used for piping systems, liquid handling of the control device, select the valve of the first step is to understand the function of a variety of valves and we hope the valves, installed after the completion of the tasks entrusted to him, we and efficiency.
2. Valve classification
(1) Valve according to their functions, as follows:
A. Switching Valves: valve, plug valve, ball valve.
B. throttle categories: ball valve, needle valve, angle, disc-type valves, valve.
C. Check categories: swing, lift and dual-plate check valve, bottom valve.
D. Pressure Control Valves: relief valve, relief valve, safety valve.
E. Special Valves:
A. sampling valve
B. flow control valve
C. relief valve
D. other style valve
(2) classification according to material
A. Non-Metallic Valves: PVC, plastic (steel), such as Teflon.
B. Metal Valves
a. ferrous metals: iron, steel, stainless steel, alloy steel and so on.
B. Non-metal: aluminum, copper and so on.
(3)-way classification
A. Casting Valves: sand mold, shell mold, mold dewaxing, die-casting method, such as model, production of the metal valve.
B. Valves Forging: Forging or freedom from forging or pills (side) then the value of wood processing, metal valves production.
C. welding manufacturing valves categories: body, covered in part by the combination of a number of manufacturers by welding, such valves must pay attention to and identification of welding procedure specification (WPS and PQR).
D. Injection Valves: General used in PVC, plastic valve to be non-metallic type of manufacturing.
3. The characteristics of various types of valves
(1) Gate (GATE VALVES)
Valve in a pipeline to parts of the system needs a "full, full-off" control and fluid flow only to have a little of the pressure drop design used from time to time. When a system needs to be a part of the isolation, without having to consider cutting fluid (THROTTING) of the control valve is a very ideal and appropriate. When the savings due to use, have experience of the flow through the portal of high-speed, and the erosion caused by fluid on the door, Block and Shell (drawing generated phenomenon), or injury caused by vibration.
(2) the ball-valve (GLOBE VALVES), angle (ANGLE VALVES), needle (NEEDLE VALVE) ball because the ball-valve ball called columnar shape and are mainly to be closed for regular switches and when the fluid control the flow of expenditure should be the role of design, its most notable feature is effective to reduce expenses, so that drawing is reduced to at least be reduced as a result of the Baptist valves and valve seat (red) to lose money, but the seat is parallel to the flow line, valve seat when fluid flows through such changes, will have a spoiler in the valve, as well as the lower edge of the drop is not only suitable for the Netherlands because of the pressure drop caused by cumbersome lift in order to use.
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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Valve used for piping systems, liquid handling of the control device, select the valve of the first step is to understand the function of a variety of valves and we hope the valves, installed after the completion of the tasks entrusted to him, we and efficiency.
2. Valve classification
(1) Valve according to their functions, as follows:
A. Switching Valves: valve, plug valve, ball valve.
B. throttle categories: ball valve, needle valve, angle, disc-type valves, valve.
C. Check categories: swing, lift and dual-plate check valve, bottom valve.
D. Pressure Control Valves: relief valve, relief valve, safety valve.
E. Special Valves:
A. sampling valve
B. flow control valve
C. relief valve
D. other style valve
(2) classification according to material
A. Non-Metallic Valves: PVC, plastic (steel), such as Teflon.
B. Metal Valves
a. ferrous metals: iron, steel, stainless steel, alloy steel and so on.
B. Non-metal: aluminum, copper and so on.
(3)-way classification
A. Casting Valves: sand mold, shell mold, mold dewaxing, die-casting method, such as model, production of the metal valve.
B. Valves Forging: Forging or freedom from forging or pills (side) then the value of wood processing, metal valves production.
C. welding manufacturing valves categories: body, covered in part by the combination of a number of manufacturers by welding, such valves must pay attention to and identification of welding procedure specification (WPS and PQR).
D. Injection Valves: General used in PVC, plastic valve to be non-metallic type of manufacturing.
3. The characteristics of various types of valves
(1) Gate (GATE VALVES)
Valve in a pipeline to parts of the system needs a "full, full-off" control and fluid flow only to have a little of the pressure drop design used from time to time. When a system needs to be a part of the isolation, without having to consider cutting fluid (THROTTING) of the control valve is a very ideal and appropriate. When the savings due to use, have experience of the flow through the portal of high-speed, and the erosion caused by fluid on the door, Block and Shell (drawing generated phenomenon), or injury caused by vibration.
(2) the ball-valve (GLOBE VALVES), angle (ANGLE VALVES), needle (NEEDLE VALVE) ball because the ball-valve ball called columnar shape and are mainly to be closed for regular switches and when the fluid control the flow of expenditure should be the role of design, its most notable feature is effective to reduce expenses, so that drawing is reduced to at least be reduced as a result of the Baptist valves and valve seat (red) to lose money, but the seat is parallel to the flow line, valve seat when fluid flows through such changes, will have a spoiler in the valve, as well as the lower edge of the drop is not only suitable for the Netherlands because of the pressure drop caused by cumbersome lift in order to use.
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
Characteristics and advantages of the fixed ball valve
The characteristics of the fixed ball valve
1, double-blocking and emission features: the fixed valve seat using a floating spring preload, regardless of the valve is fully on or off state, on the downstream side of the seat so that fluid blocked valve in the cavity through the discharge of residual materials valve discharge.
2, automatic pressure relief feature: the valve body cavity to stay medium temperature anomalies caused by step-up, the do not pass through safety valve, while the feature alone can be automatic pressure relief valve seats, which ensure that the valve in the transportation of liquid medium Security is very important.
3, fire safety structure: the valve is equipped fire safety features, its design, manufacture were to follow API 607 and API 6FA specifications. Fixed ball picture ball valve fixed ball valve Fixed chart image
The advantages of a fixed ball valve
1, sealing grease for emergency ambulance Note: As the medium of a foreign object or fire accidents caused by the valve seat seal failure, injection valve provided with grease gun greasing the fast connections, easily and quickly sealed grease is injected into the valve seat seal parts, ease the leakage .
2, reliable stem sealing and low operating torque: In addition to setting the standard sealing ring, the packing gland has also set up "O"-rings, double sealed to ensure the reliability of the valve stem seals; addition of graphite filler and sealing grease to make a fire after the injection of stem leakage to a minimum. Stem sliding bearings and thrust bearings so that the valve operation of the Light.
3, Full Bore or reduced bore: according to the need to use the whole path or necking structure. Full Bore Valve flow aperture in line with the pipeline diameter, easy to clean pipelines.
4, stem can be lengthened: According to the installation or operation of the necessary, can be extended to the valve stem. Plus long-rod valve is especially suitable for urban gas pipelines that require the laying of underground occasions. Long stem size according to customers need to be identified.
5, flexible operation: Using a small friction coefficient and good self-lubrication of valve seats and valve stem bearings, greatly reducing the operation of the valve torque. Thus, even in the case did not provide sealing grease, it is also the long-term flexibility to operate freely against the valve 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 .
Need, please e-mail to valve401@gmail.com
1, double-blocking and emission features: the fixed valve seat using a floating spring preload, regardless of the valve is fully on or off state, on the downstream side of the seat so that fluid blocked valve in the cavity through the discharge of residual materials valve discharge.
2, automatic pressure relief feature: the valve body cavity to stay medium temperature anomalies caused by step-up, the do not pass through safety valve, while the feature alone can be automatic pressure relief valve seats, which ensure that the valve in the transportation of liquid medium Security is very important.
3, fire safety structure: the valve is equipped fire safety features, its design, manufacture were to follow API 607 and API 6FA specifications. Fixed ball picture ball valve fixed ball valve Fixed chart image
The advantages of a fixed ball valve
1, sealing grease for emergency ambulance Note: As the medium of a foreign object or fire accidents caused by the valve seat seal failure, injection valve provided with grease gun greasing the fast connections, easily and quickly sealed grease is injected into the valve seat seal parts, ease the leakage .
2, reliable stem sealing and low operating torque: In addition to setting the standard sealing ring, the packing gland has also set up "O"-rings, double sealed to ensure the reliability of the valve stem seals; addition of graphite filler and sealing grease to make a fire after the injection of stem leakage to a minimum. Stem sliding bearings and thrust bearings so that the valve operation of the Light.
3, Full Bore or reduced bore: according to the need to use the whole path or necking structure. Full Bore Valve flow aperture in line with the pipeline diameter, easy to clean pipelines.
4, stem can be lengthened: According to the installation or operation of the necessary, can be extended to the valve stem. Plus long-rod valve is especially suitable for urban gas pipelines that require the laying of underground occasions. Long stem size according to customers need to be identified.
5, flexible operation: Using a small friction coefficient and good self-lubrication of valve seats and valve stem bearings, greatly reducing the operation of the valve torque. Thus, even in the case did not provide sealing grease, it is also the long-term flexibility to operate freely against the valve 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 .
Need, please e-mail to valve401@gmail.com
Valves involved in the procurement of the eight essential technical factors
Valve procurement is only a clear specification, type, work pressure to meet the procurement requirements on the practice of a market economy in the current environment is not perfect. Because the valve manufacturers for products, competition, each valve were unified design concept, innovation differently, forming their own company standards and product personality. Therefore, the valve procurement made a more detailed technical requirements, coordinating with manufacturers to reach a consensus, as the valve procurement annex to the contract is very necessary.
1. General Requirements
1.1 valve size and type of pipe should be consistent with the requirements of design documents.
1.2 Valve model should be specified based on the GB number required. If the enterprise standards, should be specified models for instructions.
1.3 valve job pressure ≥ pipeline working pressure, without affecting the price under the premise of the valve can withstand the public pressure should be greater than the actual working pressure pipelines; valve closed position, or any side should be able to withstand 1.1 times the value of the valve working pressure without leakage; the valve open position, the valve should be able to withstand twice the working pressure valve requirements.
1.4 valve manufacturing standards, should indicate the basis of the national standard number, if the enterprise standards, procurement contracts shall be attached to business documents.
2. Valve-standard quality
2.1 The valve body material should be ductile iron-based, and indicate the actual grade and the cast iron the physical and chemical test data.
2.2 stem material, and strive to stainless steel stem (2CR13), large diameter valves also should be embedded in the package of stainless steel stem.
2.3 nut material, brass or cast aluminum with 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 in the water-soaked conditions and the valve stem, valve did not form a electrochemical corrosion.
2.5 ① valve sealing surface material of different types, sealing methods and materials require different; ② Ordinary wedge gate valve, copper rings of material, fixed method, grinding method should show; ③ soft sealing gate valve, the valve plate lining plastic materials, physical chemistry and health testing data; ④ valve should be marked on the sealing surface of valve body materials and butterflies on-board sealing surface material; their physical and chemical test data, especially in rubber health requirements, anti-aging properties, wear resistance ; commonly used nitrile rubber and EPDM rubber, recycled plastic mixed with strictly prohibited.
2.6 filler valve shaft ① The pipe network in the valves, usually do not open and close frequently, requiring the filling in a few years of inactivity, filler is not aging, long-term effects remain sealed; ② fill valve shaft should also bear the frequent open and close When a good sealing effect of; ③ light of the above requirements, fill valve shaft for life does not seek to change or 10 years without replacing them; ④ For packing replacement, the valve should be designed to have a situation of pressure change measures.
3. Speed gearbox
3.1 box and the internal and external anti-corrosion material requirements and body principles.
3.2 The cabinet should be sealed measures assembled box can withstand 3 meters on water-immersion.
3.3 Cabinet on the hoist limit devices, adjustment of nuts or cabinets should be located in boxes outside, but special tools need to be operating.
3.4 Drive structural design is reasonable, open and close valves can only be driven axis, not from top to bottom so that it ran a modest bite transmission parts, does not produce when the separation skid with a load hoisting.
3.5 Variable Speed Drive Cabinet Office with the valve shaft seal is not linked into the overall leak-free, or string should be a reliable anti-leakage measures.
3.6 cabinets without debris, the gear meshing parts of grease should be protected.
4. Valve operating mechanism
4.1 Valve operation of the hoist direction should always be clockwise closing.
4.2 As the pipe network of valves, often manual hoist, hoist a few should not be too much to switch, that is, large-diameter valves should also be within the 200-600 turn.
4.3 In order to facilitate a person's open and close operation, pressure conditions in the plumber, the biggest might be desirable for hoisting torque 240N-m.
4.4 The valve should open and close operation of client side tenon, and the size of standardization, and facing the ground so that people can be directly manipulated from the ground. With a wheel valve does not apply to underground pipe network.
4.5 degree of the valve open and close the valve open and close the display plate ① degree of scale-line should be cast in the gearbox cover or change the direction of the shell plate after the show, the all facing the ground, scale wire brush on the phosphor, to show that eye-catching; ② direct dial & hand in the management of the materials available under better circumstances stainless steel plate, otherwise the painting of the steel plate, not to use aluminum leather production; ③ direct dial & hand eye-catching, fixed solid, once open and close, after an accurate adjustment should be locked rivets.
4.6 If the valve buried deep, operating mechanism and display the distance ≥ 1.5m from the ground plate, the pole should have added facilities, and secure a fixed so that people from the ground observation and operation. In other words, pipe network in the valves open and close operation, should not work underground operations.
5. Valve performance testing
5.1 valve of a standard high-volume manufacturing, the authoritative body should be entrusted to make the following performance test: ① valve pressure conditions in the work of hoisting torque; ② pressure conditions in the industry can ensure the valve closes tightly continuous Kai closing times; ③ water valve in the pipeline resistance coefficient of flow conditions testing.
5.2 The valve should be carried out before leaving the factory the following test: ① the valve in the open position, the valve should withstand twice the value of the valve working pressure of the internal pressure test; ② valve closure situation, both sides were to withstand 1.1 times the the value of working pressure valve, no leakage; but metal sealed butterfly valve, leakage value is not greater than the relevant requirements.
6. Valve's internal and external corrosion
6.1 Body (including the variable speed transmission box) inside and outside, we should first shot blasting sand blasting, and strive to electrostatic spraying epoxy resin powder non-toxic, thickness of 0.3mm or more. Large non-toxic epoxy electrostatic spray valves have difficulties, they should do brushing, spraying a similar non-toxic epoxy paint.
6.2 Valve and valve plate all parts of the house for a full anti-corrosion, on the one hand immersed in water will not rust, in between the two metals does not produce the electrochemical corrosion; two areas over the water resistance of a smooth surface to decrease.
6.3 The valve body paint anti-corrosion epoxy resin or health requirements, there should be the appropriate authority of the organs of test report. Chemical physical properties should also meet the relevant requirements.
7. Valve Packing, Transport
7.1 The valve should be located on both sides of light blocking plate solid seal.
7.2, the small-caliber valve should be bundled straw, and transported in suitable containers.
7.3 The large-diameter valves are also simple framework for solid wood packaging, so as to avoid damage during transport in touch.
8. Valve manual valve is factory equipment, the factory should be marked with the following instructions related to data: the valve specifications; model; work pressure; manufacturing standards; body material; stem material; sealing material; valve shaft packing material; Stem sleeve material; internal and external anti-corrosion material; Action start direction; rpm; public pressure situations headstock torque; factory factory name; factory date; serial number; weight; connecting flange diameter, pore number, the center hole distance; with graphic images indicate the overall length, width and height of the control size; valve flow resistance coefficient; effectively open and close times; valve factory testing data and installation, maintenance for attention.
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 .
Need, please e-mail to valve401@gmail.com
1. General Requirements
1.1 valve size and type of pipe should be consistent with the requirements of design documents.
1.2 Valve model should be specified based on the GB number required. If the enterprise standards, should be specified models for instructions.
1.3 valve job pressure ≥ pipeline working pressure, without affecting the price under the premise of the valve can withstand the public pressure should be greater than the actual working pressure pipelines; valve closed position, or any side should be able to withstand 1.1 times the value of the valve working pressure without leakage; the valve open position, the valve should be able to withstand twice the working pressure valve requirements.
1.4 valve manufacturing standards, should indicate the basis of the national standard number, if the enterprise standards, procurement contracts shall be attached to business documents.
2. Valve-standard quality
2.1 The valve body material should be ductile iron-based, and indicate the actual grade and the cast iron the physical and chemical test data.
2.2 stem material, and strive to stainless steel stem (2CR13), large diameter valves also should be embedded in the package of stainless steel stem.
2.3 nut material, brass or cast aluminum with 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 in the water-soaked conditions and the valve stem, valve did not form a electrochemical corrosion.
2.5 ① valve sealing surface material of different types, sealing methods and materials require different; ② Ordinary wedge gate valve, copper rings of material, fixed method, grinding method should show; ③ soft sealing gate valve, the valve plate lining plastic materials, physical chemistry and health testing data; ④ valve should be marked on the sealing surface of valve body materials and butterflies on-board sealing surface material; their physical and chemical test data, especially in rubber health requirements, anti-aging properties, wear resistance ; commonly used nitrile rubber and EPDM rubber, recycled plastic mixed with strictly prohibited.
2.6 filler valve shaft ① The pipe network in the valves, usually do not open and close frequently, requiring the filling in a few years of inactivity, filler is not aging, long-term effects remain sealed; ② fill valve shaft should also bear the frequent open and close When a good sealing effect of; ③ light of the above requirements, fill valve shaft for life does not seek to change or 10 years without replacing them; ④ For packing replacement, the valve should be designed to have a situation of pressure change measures.
3. Speed gearbox
3.1 box and the internal and external anti-corrosion material requirements and body principles.
3.2 The cabinet should be sealed measures assembled box can withstand 3 meters on water-immersion.
3.3 Cabinet on the hoist limit devices, adjustment of nuts or cabinets should be located in boxes outside, but special tools need to be operating.
3.4 Drive structural design is reasonable, open and close valves can only be driven axis, not from top to bottom so that it ran a modest bite transmission parts, does not produce when the separation skid with a load hoisting.
3.5 Variable Speed Drive Cabinet Office with the valve shaft seal is not linked into the overall leak-free, or string should be a reliable anti-leakage measures.
3.6 cabinets without debris, the gear meshing parts of grease should be protected.
4. Valve operating mechanism
4.1 Valve operation of the hoist direction should always be clockwise closing.
4.2 As the pipe network of valves, often manual hoist, hoist a few should not be too much to switch, that is, large-diameter valves should also be within the 200-600 turn.
4.3 In order to facilitate a person's open and close operation, pressure conditions in the plumber, the biggest might be desirable for hoisting torque 240N-m.
4.4 The valve should open and close operation of client side tenon, and the size of standardization, and facing the ground so that people can be directly manipulated from the ground. With a wheel valve does not apply to underground pipe network.
4.5 degree of the valve open and close the valve open and close the display plate ① degree of scale-line should be cast in the gearbox cover or change the direction of the shell plate after the show, the all facing the ground, scale wire brush on the phosphor, to show that eye-catching; ② direct dial & hand in the management of the materials available under better circumstances stainless steel plate, otherwise the painting of the steel plate, not to use aluminum leather production; ③ direct dial & hand eye-catching, fixed solid, once open and close, after an accurate adjustment should be locked rivets.
4.6 If the valve buried deep, operating mechanism and display the distance ≥ 1.5m from the ground plate, the pole should have added facilities, and secure a fixed so that people from the ground observation and operation. In other words, pipe network in the valves open and close operation, should not work underground operations.
5. Valve performance testing
5.1 valve of a standard high-volume manufacturing, the authoritative body should be entrusted to make the following performance test: ① valve pressure conditions in the work of hoisting torque; ② pressure conditions in the industry can ensure the valve closes tightly continuous Kai closing times; ③ water valve in the pipeline resistance coefficient of flow conditions testing.
5.2 The valve should be carried out before leaving the factory the following test: ① the valve in the open position, the valve should withstand twice the value of the valve working pressure of the internal pressure test; ② valve closure situation, both sides were to withstand 1.1 times the the value of working pressure valve, no leakage; but metal sealed butterfly valve, leakage value is not greater than the relevant requirements.
6. Valve's internal and external corrosion
6.1 Body (including the variable speed transmission box) inside and outside, we should first shot blasting sand blasting, and strive to electrostatic spraying epoxy resin powder non-toxic, thickness of 0.3mm or more. Large non-toxic epoxy electrostatic spray valves have difficulties, they should do brushing, spraying a similar non-toxic epoxy paint.
6.2 Valve and valve plate all parts of the house for a full anti-corrosion, on the one hand immersed in water will not rust, in between the two metals does not produce the electrochemical corrosion; two areas over the water resistance of a smooth surface to decrease.
6.3 The valve body paint anti-corrosion epoxy resin or health requirements, there should be the appropriate authority of the organs of test report. Chemical physical properties should also meet the relevant requirements.
7. Valve Packing, Transport
7.1 The valve should be located on both sides of light blocking plate solid seal.
7.2, the small-caliber valve should be bundled straw, and transported in suitable containers.
7.3 The large-diameter valves are also simple framework for solid wood packaging, so as to avoid damage during transport in touch.
8. Valve manual valve is factory equipment, the factory should be marked with the following instructions related to data: the valve specifications; model; work pressure; manufacturing standards; body material; stem material; sealing material; valve shaft packing material; Stem sleeve material; internal and external anti-corrosion material; Action start direction; rpm; public pressure situations headstock torque; factory factory name; factory date; serial number; weight; connecting flange diameter, pore number, the center hole distance; with graphic images indicate the overall length, width and height of the control size; valve flow resistance coefficient; effectively open and close times; valve factory testing data and installation, maintenance for attention.
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 .
Need, please e-mail to valve401@gmail.com
Wenzhou, Zhejiang Province, "Wind waves" to develop new energy
Yueqing "China Instrument" wind turbine production and Cangnan Phaius Mountain Wind Power Station is a new energy industry in Wenzhou City, the two landmark projects. Sub-Office in Wenzhou City North, South, at both ends, relying on their own strengths, both want to further the development of new energy industries.
With well-developed industrial and commercial capital, the accumulation of traditional industries, technology and YUEQING electrical appliances, electronic components, machining supporting mature products, Yueqing City, many companies are entering this new energy equipment manufacturing capital-and technology-intensive industries double, to promote their case to an independent industry cluster development.
Cangnan rich wind resources, wind energy has become the city of Wenzhou, one of the earlier development. At the same time, the local coastal tide range is not only big, but also harbor a large power plant to build good geological conditions. To this end, the county proposed to build "energy center south of Zhejiang", the development and application of new energy.
The rise of new industrial clusters are
New energy equipment manufacturing industry is emerging Yueqing. Industrial chain in the city center is part of new energy equipment, machine manufacturing enterprises. "China Instrument" from the production of electrical products to enter the wind power industry, at present, the company invested more than 200 million yuan with the German wind power company produced 1.5 MW wind turbines has been off the assembly line, mass production this year. Drilling Po Electronics Co., Ltd. is the production of small wind turbines, has been used in road works, lighting, fishing vessels, and other aspects of civilian families.
In Yueqing, the whole of the upper reaches of the production of key components necessary for it to achieve local procurement. Composite Materials Co., Ltd. Yueqing Huatai wind power production of the necessary cabin equipment enclosures, glass fiber reinforced plastic blades. HOSSONI Electric Co., Ltd. Intelligent wind power production, solar energy device replacement for solar photovoltaic systems and wind power generation system to provide support. Shen Jiang Valve Co., Ltd. for the provision of large wind power equipment, heavy-duty alloy steel castings, forged steel parts.
Downstream of the wind farm industry and related transmission and distribution equipment manufacturers, local enterprises to participate in the same. This year, the Lok Hing Holdings Limited has applied to wind turbine production cables. At present, these products had been successful more than 30 million yuan.
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With well-developed industrial and commercial capital, the accumulation of traditional industries, technology and YUEQING electrical appliances, electronic components, machining supporting mature products, Yueqing City, many companies are entering this new energy equipment manufacturing capital-and technology-intensive industries double, to promote their case to an independent industry cluster development.
Cangnan rich wind resources, wind energy has become the city of Wenzhou, one of the earlier development. At the same time, the local coastal tide range is not only big, but also harbor a large power plant to build good geological conditions. To this end, the county proposed to build "energy center south of Zhejiang", the development and application of new energy.
The rise of new industrial clusters are
New energy equipment manufacturing industry is emerging Yueqing. Industrial chain in the city center is part of new energy equipment, machine manufacturing enterprises. "China Instrument" from the production of electrical products to enter the wind power industry, at present, the company invested more than 200 million yuan with the German wind power company produced 1.5 MW wind turbines has been off the assembly line, mass production this year. Drilling Po Electronics Co., Ltd. is the production of small wind turbines, has been used in road works, lighting, fishing vessels, and other aspects of civilian families.
In Yueqing, the whole of the upper reaches of the production of key components necessary for it to achieve local procurement. Composite Materials Co., Ltd. Yueqing Huatai wind power production of the necessary cabin equipment enclosures, glass fiber reinforced plastic blades. HOSSONI Electric Co., Ltd. Intelligent wind power production, solar energy device replacement for solar photovoltaic systems and wind power generation system to provide support. Shen Jiang Valve Co., Ltd. for the provision of large wind power equipment, heavy-duty alloy steel castings, forged steel parts.
Downstream of the wind farm industry and related transmission and distribution equipment manufacturers, local enterprises to participate in the same. This year, the Lok Hing Holdings Limited has applied to wind turbine production cables. At present, these products had been successful more than 30 million yuan.
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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 .
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Rotary Valve in Petrochemical Plant (c)
CAA amendment has increased the use of straight travel valve chemical companies, oil refineries and other production companies to use valve in the prevention of leakage of the valve on outside input. CAA and its amendments control the leakage caused by the results of manual valves to automatic valves, control valves, the introduction of new suppliers of technology to the design of the valve to reduce leakage outside the valve. Valve to reduce leakage outside the key material of the valve packing system. Polytetrafluoroethylene (PTFE) and graphite is a two valve system commonly used filler material, in order to reduce the external leakage of the valve, many suppliers will be high-fluorine elastomers and some combination of PTFE and graphite for the valve The filler system. Perfluoro Elastomer high PTFE packing system, packing system than the energy needed to compress, but pressed graphite packing system than high-Perfluoro elastomer good times of high filler system. Compaction force of the General Assembly leading to wear and damage to stem, thereby causing leakage of the valve apart. Generally speaking, the use of rotary valves is to reduce leakage outside of the effective measures that have a rotary valve instead of the implementation of the trend-way valve.
According to Valve Manufacturers Association (Valve Manufacturer Associate VMA) with a market share can also illustrate this trend: According to data provided by VMA, the United States in 1996 ball valve, industrial valves and valve plunger shipment volume (VMA Special Records a ball valve, industrial valves and valve plunger shipment volume, in addition, VMA valve will automatically be tracked as a separate category, there is no single record of 1 / 4 rotary valve sales, but its into this type of automatic valve. VMA provided by the United States the amount of supplier shipment data, including exports but not imports) a total of 1.04 billion U.S. dollars, including the number of manual valves and automatic valves, but does not include valve. Ball the largest percentage, accounting for 54.2% of the total, accounting for 26.2 percent of industrial valves, and the remaining 19.6% share of the plunger valve (see table I).
4 Rotary Valve (1) in the refinery to reconcile the system to reconcile the oil refinery in the system, in order to enhance the quality of harmony, to reconcile the often requested to participate in a variety of precision high-speed of the oil must be injected with the cut, which often require a higher rate of the control valve to cut off so that the flow no matter how much traffic the road will be able to provide accurate mixing of the liquid. Traditional straight trip valve or cut-off valve is no longer to adapt to such refineries in the application of spin valve because of its inherent advantages described above, so that applications can provide more cost-effective. To the user to run a greater long-term gains. (2) Rotary Valve plant in my specific application in a wide range of applications: 4-way radiation coking plant feed control valve rotary valve replaced. Coking workshop designed for the original two-seat valve, as a result of the radiation coking feed containing a large number of coke particles, and temperatures are high, fast flow of control valves have a lot of erosion, control of the spool valve, valve seat soon erosion or bad, serious leakage, can not control, a new control valve can only run for 3 months; later for the control valve of the valve sleeve, the situation has changed, a new control valve will be able to run 5 months. September 1997 we will FISHER control valve for rotating the valve, as a result of rotation with anti-cavitation ability to overcome the effective scouring media, in October 1998 in which we examined a control valve, valve core, valve seats in good condition . Four control valves have been using so far. Specific applications 2: South distillation 3 Furnace Road decompression feed. The original design of vacuum furnace for 3 furnace feed valve sleeve, due to feed containing residue, impurities, control valves are often blocked, and temperatures are high, easy to condensation, to the instrument to maintain a lot of work in June 1998 3 Road FISHER feed for rotating the valve, rotary valve as a result of the flow with strong ability to overcome these problems, operating normally. Specific application 3: catalytic residue control valve back to smelting. Residue catalytic refining control valve back to the original design for the sleeve valve, as a result of smelting residue containing the catalyst back to the serious erosion control valves, control valves can not be normal use, a new control valve into the can run for 6 months, 1998 June will be in control of the rotary valve for FISHER, use so far. Specific application of 4: Catalytic air pressure machine put the torch. Catalytic air pressure machine put the torch using the original gate valve 700, the disadvantage of slow switching speed, leakage, and after a three-eccentric butterfly valve, switching speed of less than 10 seconds, sealing can be achieved 5. So there are many specific applications, to the list.
5 Conclusion The integration of refining and refining device the size of large-scale chemical plant, the production process instrumentation and control system for accuracy and adaptability requirements of increasingly stringent control system as a core component of the implementation of components - control valve, and its performance petrochemical plant and the quality of the economic benefits of the increasing influence. Whether it is the future expansion of production scale in order to improve quality control, or (as the advanced control or optimal control, etc.), have asked us in the selection of control valves, not only to consider the construction period of one-time investment, but also pay attention to the running costs of the production period. With the growing characteristics of rotary valve for people to understand and accept that its bound to be increasing in the domestic large-scale oil refining and chemical devices get more and more widely. 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
According to Valve Manufacturers Association (Valve Manufacturer Associate VMA) with a market share can also illustrate this trend: According to data provided by VMA, the United States in 1996 ball valve, industrial valves and valve plunger shipment volume (VMA Special Records a ball valve, industrial valves and valve plunger shipment volume, in addition, VMA valve will automatically be tracked as a separate category, there is no single record of 1 / 4 rotary valve sales, but its into this type of automatic valve. VMA provided by the United States the amount of supplier shipment data, including exports but not imports) a total of 1.04 billion U.S. dollars, including the number of manual valves and automatic valves, but does not include valve. Ball the largest percentage, accounting for 54.2% of the total, accounting for 26.2 percent of industrial valves, and the remaining 19.6% share of the plunger valve (see table I).
4 Rotary Valve (1) in the refinery to reconcile the system to reconcile the oil refinery in the system, in order to enhance the quality of harmony, to reconcile the often requested to participate in a variety of precision high-speed of the oil must be injected with the cut, which often require a higher rate of the control valve to cut off so that the flow no matter how much traffic the road will be able to provide accurate mixing of the liquid. Traditional straight trip valve or cut-off valve is no longer to adapt to such refineries in the application of spin valve because of its inherent advantages described above, so that applications can provide more cost-effective. To the user to run a greater long-term gains. (2) Rotary Valve plant in my specific application in a wide range of applications: 4-way radiation coking plant feed control valve rotary valve replaced. Coking workshop designed for the original two-seat valve, as a result of the radiation coking feed containing a large number of coke particles, and temperatures are high, fast flow of control valves have a lot of erosion, control of the spool valve, valve seat soon erosion or bad, serious leakage, can not control, a new control valve can only run for 3 months; later for the control valve of the valve sleeve, the situation has changed, a new control valve will be able to run 5 months. September 1997 we will FISHER control valve for rotating the valve, as a result of rotation with anti-cavitation ability to overcome the effective scouring media, in October 1998 in which we examined a control valve, valve core, valve seats in good condition . Four control valves have been using so far. Specific applications 2: South distillation 3 Furnace Road decompression feed. The original design of vacuum furnace for 3 furnace feed valve sleeve, due to feed containing residue, impurities, control valves are often blocked, and temperatures are high, easy to condensation, to the instrument to maintain a lot of work in June 1998 3 Road FISHER feed for rotating the valve, rotary valve as a result of the flow with strong ability to overcome these problems, operating normally. Specific application 3: catalytic residue control valve back to smelting. Residue catalytic refining control valve back to the original design for the sleeve valve, as a result of smelting residue containing the catalyst back to the serious erosion control valves, control valves can not be normal use, a new control valve into the can run for 6 months, 1998 June will be in control of the rotary valve for FISHER, use so far. Specific application of 4: Catalytic air pressure machine put the torch. Catalytic air pressure machine put the torch using the original gate valve 700, the disadvantage of slow switching speed, leakage, and after a three-eccentric butterfly valve, switching speed of less than 10 seconds, sealing can be achieved 5. So there are many specific applications, to the list.
5 Conclusion The integration of refining and refining device the size of large-scale chemical plant, the production process instrumentation and control system for accuracy and adaptability requirements of increasingly stringent control system as a core component of the implementation of components - control valve, and its performance petrochemical plant and the quality of the economic benefits of the increasing influence. Whether it is the future expansion of production scale in order to improve quality control, or (as the advanced control or optimal control, etc.), have asked us in the selection of control valves, not only to consider the construction period of one-time investment, but also pay attention to the running costs of the production period. With the growing characteristics of rotary valve for people to understand and accept that its bound to be increasing in the domestic large-scale oil refining and chemical devices get more and more widely. 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
Fully automatic water control valve works
Fully automatic water control valve works
1, water pump before the start of static pressure at the valve off. Pump starts, water from the valve side of the bypass pipe imports into the cavity under the diaphragm chamber, the diaphragm, together with the valve stem and small plates slowly lifted. At the same time, large valve plate is also under pressure in the inlet opens.
2, with the water flow and pressure, diaphragm, together with the stem and the large and small valve on-board rose to a high rating (which can visually signal poles).
3, when the pump stops, the valve to stop imports of polyethylene water flow, pressure reducing, large backwater valve plate in the self-determination and quickly fell under pressure until the complete access seat.
4, with the return water pressure, water from the export side of the bypass pipe into the room on the diaphragm chamber to promote the diaphragm, together with the stem and the small stem and the small valve plate slowly down. At this point, the inferior vena diaphragm chamber of water through the valve on the left side of the bypass pipe flow back imports. When the small valve plate completely closed a large valve ring between the plate and stem Discharge port when the valve has fully recovered before the start of the static pressure to the pump off.
Fully automatic water control valve failure causes and to exclude measures
1, the signal pole vertical speed is not normal because:
1, a small bypass valve or filter clogging;
2, platen or rubber diaphragm rupture or Die room too much debris;
3, the small valve was artificially closed.
Second, troubleshooting measures are:
1, check a small bypass valve handle position is correct;
2, cleaning of small valves and filters;
3, check the rubber diaphragm chamber, if the rubber diaphragm or pressure plate rupture must be replaced immediately.
3, internal leakage is too large because:
1, large and small valve plate seal damage;
2, large and small debris blocking valve plate plane are separated;
3, valve stem on mouth or debris.
4, troubleshooting measures are:
1, check the large and small valve board rubber seals, if he has damaged it is immediately replaced;
2, stop pumps remove large and small valve plate, valve seat and valve stem on the debris;
3, re-assembly, they must be clean of all parts.
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 .
Need, please e-mail to valve401@gmail.com
1, water pump before the start of static pressure at the valve off. Pump starts, water from the valve side of the bypass pipe imports into the cavity under the diaphragm chamber, the diaphragm, together with the valve stem and small plates slowly lifted. At the same time, large valve plate is also under pressure in the inlet opens.
2, with the water flow and pressure, diaphragm, together with the stem and the large and small valve on-board rose to a high rating (which can visually signal poles).
3, when the pump stops, the valve to stop imports of polyethylene water flow, pressure reducing, large backwater valve plate in the self-determination and quickly fell under pressure until the complete access seat.
4, with the return water pressure, water from the export side of the bypass pipe into the room on the diaphragm chamber to promote the diaphragm, together with the stem and the small stem and the small valve plate slowly down. At this point, the inferior vena diaphragm chamber of water through the valve on the left side of the bypass pipe flow back imports. When the small valve plate completely closed a large valve ring between the plate and stem Discharge port when the valve has fully recovered before the start of the static pressure to the pump off.
Fully automatic water control valve failure causes and to exclude measures
1, the signal pole vertical speed is not normal because:
1, a small bypass valve or filter clogging;
2, platen or rubber diaphragm rupture or Die room too much debris;
3, the small valve was artificially closed.
Second, troubleshooting measures are:
1, check a small bypass valve handle position is correct;
2, cleaning of small valves and filters;
3, check the rubber diaphragm chamber, if the rubber diaphragm or pressure plate rupture must be replaced immediately.
3, internal leakage is too large because:
1, large and small valve plate seal damage;
2, large and small debris blocking valve plate plane are separated;
3, valve stem on mouth or debris.
4, troubleshooting measures are:
1, check the large and small valve board rubber seals, if he has damaged it is immediately replaced;
2, stop pumps remove large and small valve plate, valve seat and valve stem on the debris;
3, re-assembly, they must be clean of all parts.
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 .
Need, please e-mail to valve401@gmail.com
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