Butterfly valve butterfly plate installed in the direction of the pipe diameter. Cylindrical channel in the valve body, the disc-shaped butterfly plate around the axis of rotation, rotation angle between 0 ° 90 °, ° rotated to 90 when the valve is fully open state license . Butterfly simple structure, small size, light weight, only by a small number of parts. And just rotated 90 ° to quickly open and close, easy to operate, while the flow control valve has a good feature.
Butterfly in the fully open position, the butterfly plate thickness is only when the medium flows through the valve body resistance through the valve so the pressure drop generated by small, it has good flow control characteristics. There are shells and metal sealing butterfly valve seal two kinds of sealed type. Elastic sealing valves, seals can be mounted on the body or attached to the butterfly board peripheral. 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. Strength properties of the valve is the valve to withstand medium pressure capacity. Withstand the internal pressure valve is a mechanical product, and therefore must have sufficient strength and rigidity to ensure the long-term use without breakage or deformation.
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Monday, October 4, 2010
Sunday, October 3, 2010
Mitac valves for nuclear power plant in Jiangsu valve into the contribution made
Mitac Valve Co., Ltd. Jiangsu recently with the China Guangdong Nuclear Power Engineering Co., Ltd. signed a one million kilowatts for the pressurized water reactor nuclear power plant project-level home-made nuclear-grade valve contract, which amounted to 150 million yuan. The signing of the contract of the project, marking the company's research and development in Jiangsu magical ability to have a qualitative leap.
Butterfly valve for the realization of the nuclear island, the nuclear island of the ball valve in China, in July 2006, Mitac project working group was established to start the main class one million kilowatts of PWR nuclear power plant safety ball valves of the development of the shell. After more than a year of research efforts, in July 2007 to Red river project-based works, one million kilowatts of PWR nuclear power plant safety-class gate valve shell product trial success, and through a series of professional pilot. May 2008, which was adopted by the National Development and Reform Commission, the National Nuclear Safety Administration, China Machinery Industry Federation and other departments to identify the composition of the authority of the expert group. The Group believes that the performance of valves and related technology to meet the standard requirements of the technical indicators have reached international advanced level.
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Butterfly valve for the realization of the nuclear island, the nuclear island of the ball valve in China, in July 2006, Mitac project working group was established to start the main class one million kilowatts of PWR nuclear power plant safety ball valves of the development of the shell. After more than a year of research efforts, in July 2007 to Red river project-based works, one million kilowatts of PWR nuclear power plant safety-class gate valve shell product trial success, and through a series of professional pilot. May 2008, which was adopted by the National Development and Reform Commission, the National Nuclear Safety Administration, China Machinery Industry Federation and other departments to identify the composition of the authority of the expert group. The Group believes that the performance of valves and related technology to meet the standard requirements of the technical indicators have reached international advanced level.
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Need, please e-mail to valve401@gmail.com
Rotary Valve in Petrochemical Plant (a)
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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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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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.
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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.
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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
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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
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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
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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.
valve ball valve gate valve check valve globe valve butterfly 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
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.
valve ball valve gate valve check valve globe valve butterfly 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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