June 5, China Machinery Industry Federation commissioned by the National Energy Board, held in Suzhou, China Nuclear Industry Company Limited Su-valve technology and the China Guangdong Nuclear Power Engineering Co., Ltd. jointly developed pressurized water reactor nuclear power plant nuclear level of nuclear safety-grade electric globe valve, nuclear ball valve V-2, W-2 nuclear power valve, such as valves 7 prototype appraisal of scientific and technological achievements, the Group agreed that the 7 prototype is developed using a combination of research , a successful example of self-innovation, in which two wedge-type nuclear power gate valve and pneumatic valve development filled the gap, be technically competent foreign advanced level of similar products to further promote the nuclear localization process valves
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Tuesday, August 10, 2010
Valve principle and structure types of analysis
Valve is an automated pipeline to reduce the work pressure of specialized equipment, it can be a high pressure valve before the pipeline after the pipeline valve reduced to the required level. Valve is widely used in high-rise building, city water supply high pressure in the network area, mines, and other occasions, in order to ensure water supply system, each point of access to appropriate services, water pressure and flow. In view of the rate of water leakage and waste water system is almost the same proportion to the size of the water pressure, so reducing valve has to improve the system operating conditions and potential water-saving effect, according to statistics about 30% of its water-saving effect.
The construction of many types of valve, in the past often have membrane-type, inner spring piston and so on. The basic principle is that the role of valve by valve flow channel to reduce local resistance to the flow of water pressure, water pressure drop range from connection valve piston valve on both sides of import and export of films, or automatically adjust the water pressure difference. Emerged in recent years, some new pressure reducing valve, reducing valve, if given more than. Set theory is the use of more than decompression valve piston floating in water pressure than the control, import and export and import and export side than the end of decompression area ratio is inversely proportional to the piston. Such valves working smoothly without vibration; valve body without spring, so no spring corrosion, metal fatigue failure of taking into account; sealing good performance does not leak, thus both reducing the dynamic pressure (water flow) also reduced static pressure (flow rate 12:00); particularly in the decompression at the same time does not affect the water flow.
DN50 ~ DN100 valves usually have a variety of specifications, valves before and after the work pressure were <1MPa and 0.1 ~ 0.5MPa, voltage range of error of ± 5% ~ 10%.
It should be noted, though much water flow through the valve head loss, but because of reduced flow of water wastage and a reasonable distribution system, improving the system layout and operating conditions, so the whole is still energy-efficient.
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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The construction of many types of valve, in the past often have membrane-type, inner spring piston and so on. The basic principle is that the role of valve by valve flow channel to reduce local resistance to the flow of water pressure, water pressure drop range from connection valve piston valve on both sides of import and export of films, or automatically adjust the water pressure difference. Emerged in recent years, some new pressure reducing valve, reducing valve, if given more than. Set theory is the use of more than decompression valve piston floating in water pressure than the control, import and export and import and export side than the end of decompression area ratio is inversely proportional to the piston. Such valves working smoothly without vibration; valve body without spring, so no spring corrosion, metal fatigue failure of taking into account; sealing good performance does not leak, thus both reducing the dynamic pressure (water flow) also reduced static pressure (flow rate 12:00); particularly in the decompression at the same time does not affect the water flow.
DN50 ~ DN100 valves usually have a variety of specifications, valves before and after the work pressure were <1MPa and 0.1 ~ 0.5MPa, voltage range of error of ± 5% ~ 10%.
It should be noted, though much water flow through the valve head loss, but because of reduced flow of water wastage and a reasonable distribution system, improving the system layout and operating conditions, so the whole is still energy-efficient.
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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Sunday, August 8, 2010
Plastic sub-catchment and the valve device works in the application of warm (c)
1.2.3 plastic filter design requirements
Should be consistent with the use of design-level thickness and hydrostatic test requirements.
1.3 Short-term performance requirements
1.3.1 plastics are the requirements for sub-catchment
Plastic pipe shall meet the corresponding trunk line pipe tube hydrostatic strength.
1.3.2 the requirements of plastic valves
Short-term performance standards in the product factory inspections are mainly done pilot seat and valve sealing the sealed test, used to check the sealing performance of plastic valves, plastic valves that request can not be within the leakage (valve seat leakage ) phenomenon, we can not have outside leakage (valve leakage) phenomenon. Heating Network
Seat of the valve sealing test is to verify the performance of the piping system isolation; valve sealing test is to verify that the valve stem seals and the valve sealing end of the connection of the leakage Department.
Note: 1) products in accordance with the relevant provisions of torque switch valve;
2) The minimum test pressure of 0.05MPa;
3) the maximum test pressure (PN +0.5) MPa;
4) Nominal valve size DN ≤ 200: Test time for at least 15s, DN ≥ 250: Test time for at least 30s;
5) Nominal valve size DN ≤ 50: Test of time at least 15s, DN ≥ 65: Test time for at least 30s.
Test Method: According to GB/T6111-2003 "fluid resistant thermoplastic plastic pipe pressure test method" provisions. Do experiments with the valve seat seal valve clearance should be at a state-wide; to do the pilot valve should be sealed so that the location of valves in the full or semi-open position (such as ball valve), fluid can be semi-open access to stem sealing position. Sealed for a one-way valves, the valve seat in one direction only sealed test; and sealed a two-way valves, the valve seat is sealed in both directions need to do tests.
Net emission test requirements of the air valve in the sample, test pressure gradually increased, 30s up to the required pressure inside the heating heating network.
It should be noted that during the pilot test device can not generate additional stress valve.
Abroad, some companies can not use compressed gas to stress on the plastic valve pressure test done, because different media.
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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Should be consistent with the use of design-level thickness and hydrostatic test requirements.
1.3 Short-term performance requirements
1.3.1 plastics are the requirements for sub-catchment
Plastic pipe shall meet the corresponding trunk line pipe tube hydrostatic strength.
1.3.2 the requirements of plastic valves
Short-term performance standards in the product factory inspections are mainly done pilot seat and valve sealing the sealed test, used to check the sealing performance of plastic valves, plastic valves that request can not be within the leakage (valve seat leakage ) phenomenon, we can not have outside leakage (valve leakage) phenomenon. Heating Network
Seat of the valve sealing test is to verify the performance of the piping system isolation; valve sealing test is to verify that the valve stem seals and the valve sealing end of the connection of the leakage Department.
Note: 1) products in accordance with the relevant provisions of torque switch valve;
2) The minimum test pressure of 0.05MPa;
3) the maximum test pressure (PN +0.5) MPa;
4) Nominal valve size DN ≤ 200: Test time for at least 15s, DN ≥ 250: Test time for at least 30s;
5) Nominal valve size DN ≤ 50: Test of time at least 15s, DN ≥ 65: Test time for at least 30s.
Test Method: According to GB/T6111-2003 "fluid resistant thermoplastic plastic pipe pressure test method" provisions. Do experiments with the valve seat seal valve clearance should be at a state-wide; to do the pilot valve should be sealed so that the location of valves in the full or semi-open position (such as ball valve), fluid can be semi-open access to stem sealing position. Sealed for a one-way valves, the valve seat in one direction only sealed test; and sealed a two-way valves, the valve seat is sealed in both directions need to do tests.
Net emission test requirements of the air valve in the sample, test pressure gradually increased, 30s up to the required pressure inside the heating heating network.
It should be noted that during the pilot test device can not generate additional stress valve.
Abroad, some companies can not use compressed gas to stress on the plastic valve pressure test done, because different media.
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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gate Valve Technology
(gate valve) is the gate to open and close parts, ram direction of motion perpendicular to the direction of the fluid, valve only for full-and full-off, can not be adjusted and cut expenditure. There are two gate sealing surface, the most common mode of gate valve sealing surface to form two wedge-shaped, wedge-shaped angle with the valve parameters vary, usually 50, medium temperature is not high when 2 ° 52 '. Wedge gate valve gate can be made into a whole, called the rigid damper; also be made to produce small quantities of deformation gate in order to improve their craft-oriented, to make up the sealing surface angle in the processing error generated in the process, this sluice gate is called elastic.
Valve types, according to the sealing surface configuration can be divided into wedge gate-type valve and parallel gate-type valve, wedge gate-type valve can be divided into: single-gate type, Shuangzha plate and elastic damper type; parallel gate-type valve can be divided into single-ram type and Shuangzha plate. Location by stem thread are divided into Ming and dark rod valve valve two kinds of stroke.
Valve closed, the sealing surface can only rely on media pressure to seal, that is, to rely on media pressure to ram pressure to the other side of the sealing surface of the seat to ensure the sealing surface of the seal, which is self-sealing. Most of mandatory sealed valve is used, namely, the valve is closed, we must rely on outside pressure to force the gate to the seat in order to ensure the sealing surface of the seal.
The gate valve with the valve stem to make a straight line with the movement, called the lift rod valve (also called Ming shot valve). Often movements are trapezoidal threaded rod through the valve nut and the valve on the top of the guide groove, the rotary motion into linear motion, that is, the operation of torque, thrust into action.
Open the valve, when the gate valve lifting height is equal to 1:1 times the diameter, the fluid flow channel completely, but at run time, this location can not be monitored. Actual use, based on the apex of stem as a sign that the movement of non-position, as its fully open position. Temperature changes appear to consider locking phenomenon, usually open to the vertex position, and then inverted back 1/2-1 circle, as a fully open valve position. Therefore, the valve fully open position, according to damper position (ie, travel "to determine.
Some valve, the stem nut is located at the gate, the hand-driven rotation of valve stem rotation, leaving gate to upgrade, this valve is called the rotating rod valve or valve called the dark bar.
Manual valve works:
Handwheel by hand wheel and stem of the thread forward, back, raised or lowered to connect the valve plate with the stem to achieve the role of open and closed
Valve has the following advantages:
Fluid resistance is small, the sealing surface by the media, distressed small brush and erosion.
Opening and closing more labor-saving.
Medium flows unrestricted, non-spoiler, without reducing pressure.
A simple shape, structure, length short, good manufacturing processes applicable to a wide range.
Valve defects are as follows:
Between the sealing surface could easily cause erosion and abrasion, maintenance more difficult.
Overall large size, open requires a certain space, opening and closing a long time.
Structure is more complicated.
The type of gate width, according to the sealing surface configuration can be divided into wedge gate-type valve and parallel gate-type valve, wedge gate-type valve can be divided into: single-gate type, Shuangzha plate and elastic damper type; parallel gate-type valve can be divided into single-ram type and Shuangzha plate. Location by stem thread are divided into Ming and dark rod valve valve two kinds of stroke.
Valve installation and maintenance should note the following items:
Hand-wheel, handle and the transmission mechanism for lifting are not allowed to use, and are prohibited from collisions.
Shuangzha vertical plate gate valve should be installed (ie, stem in a vertical position, the hand wheel at the top).
With a bypass valve to open the valve opening should be preceded by-pass valve (in order to balance imports and exports and reducing pressure opening force).
The valve with a transmission mechanism, according to product instructions for the installation.
If you frequently switch the valve to use, lubrication at least once a month.
Structural features:
For a long time on the market with the general valve widespread the phenomenon of water leakage or rust, the introduction of European high-tech enterprise manufacturing technology of the rubber and the valve seat seal gate valve produced the flexibility to overcome the general bad valve seals, rust, etc. defects, flexible valve seat seal gate produce small quantities of elastic compensation for the role of elastic deformation to achieve a good sealing effect, the valve has a switch light, sealing, reliable, good elastic memory, and the service life of significant advantages. It can be widely used in tap water, sewage, construction, petroleum, chemical, food, medicine, textile, electric power, shipbuilding, metallurgy, energy systems, pipelines, as a regulating body and the closure device.
Gate features:
Light weight: body made of high grade cast iron ball black, lighter in weight than conventional valve to reduce the weight of about 20% to 30%, installation and maintenance easy.
Flat-type gate seat: Traditional washing pipe valve often pass as soon as a result of foreign objects such as stone, wood, cement, iron filings, and other debris deposited on the valve at the end of recess, the easily lead to the formation of leakage can not be closed tightly and the phenomenon of and flexible use of seat seal gate valve at the bottom of the pan with the water machines with the design, easy to siltation caused by debris, so that smooth flow of fluid.
Overall Package glue: gate using high quality rubber as a whole, the outsourcing of glue, Europe's leading technology allows vulcanized rubber vulcanization after the gate to ensure accurate geometry, and the rubber and solid ductile cast gate and then not easy to come off and flexible memory good. Water
Casting Valve: Valve using precision casting, precision geometry makes the body without any finish can be guaranteed within the valve sealing.
Valve has the following advantages:
1, fluid resistance is small, the sealing surface by the media, distressed small brush and erosion.
2, opening and closing more effort.
3, medium flow unrestricted, non-spoiler, without reducing pressure.
4, a simple shape, structure, length short, good manufacturing processes applicable to a wide range.
Valve defects are as follows:
1, between the sealing surface could easily cause erosion and abrasion, maintenance more difficult.
2, form large size, open requires a certain space, opening and closing a long time.
3, the structure more complex.
The type of gate width, according to the sealing surface configuration can be divided into wedge gate-type valve and parallel gate-type valve, wedge gate-type valve can be divided into: single-gate type, Shuangzha plate and elastic damper type; parallel gate-type valve can be divided into single-ram type and Shuangzha plate. Location by stem thread are divided into Ming and dark rod valve valve two kinds of stroke.
Valve installation and maintenance should note the following items:
1, hand wheels, handles and the transmission mechanism for lifting are not allowed to use, and are prohibited from collisions.
2, Shuangzha plate gate valve should be mounted vertically (ie the stem in a vertical position, the hand wheel at the top).
3, with a bypass valve opens the valve opening should be preceded by bypass valve (in order to balance imports and exports and reducing pressure opening force). Stainless steel electrode
4, with transmission of the valve, according to product instructions for the installation.
5, if the valve frequently switch the use of lubrication at least once a month.
Gate of the main criteria
(1) GB12232-89 "Link Universal Valve Flanged iron gate valves"
(2) GB12234-89 "universal valve steel gate valve connecting flange and butt"
(3) GB8486-87 "threaded connection within the gate, as valve, ball valve, check valve common technical regulations"
(4) GB8465.1-87 "threaded connection within the gate, as valve, ball valve, check valve basic size iron gate"
(5) JB/T53162-94 "Valve Product Quality Grading"
(6) JB/T5298-91 "pipeline with the steel plate gate valve"
(7) JB/Z243-85 "gate static life test procedures"
(8) JB/TQ648-88 "Flat Iron Gate on the folder"
(9) JB/T53200-94 "iron gate valve on the price of flat-panel product quality grading"
(10) JB/T53242-94 "steel plate gate valve product quality and grading"
ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve ball valve V Type Ball Valve
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Valve types, according to the sealing surface configuration can be divided into wedge gate-type valve and parallel gate-type valve, wedge gate-type valve can be divided into: single-gate type, Shuangzha plate and elastic damper type; parallel gate-type valve can be divided into single-ram type and Shuangzha plate. Location by stem thread are divided into Ming and dark rod valve valve two kinds of stroke.
Valve closed, the sealing surface can only rely on media pressure to seal, that is, to rely on media pressure to ram pressure to the other side of the sealing surface of the seat to ensure the sealing surface of the seal, which is self-sealing. Most of mandatory sealed valve is used, namely, the valve is closed, we must rely on outside pressure to force the gate to the seat in order to ensure the sealing surface of the seal.
The gate valve with the valve stem to make a straight line with the movement, called the lift rod valve (also called Ming shot valve). Often movements are trapezoidal threaded rod through the valve nut and the valve on the top of the guide groove, the rotary motion into linear motion, that is, the operation of torque, thrust into action.
Open the valve, when the gate valve lifting height is equal to 1:1 times the diameter, the fluid flow channel completely, but at run time, this location can not be monitored. Actual use, based on the apex of stem as a sign that the movement of non-position, as its fully open position. Temperature changes appear to consider locking phenomenon, usually open to the vertex position, and then inverted back 1/2-1 circle, as a fully open valve position. Therefore, the valve fully open position, according to damper position (ie, travel "to determine.
Some valve, the stem nut is located at the gate, the hand-driven rotation of valve stem rotation, leaving gate to upgrade, this valve is called the rotating rod valve or valve called the dark bar.
Manual valve works:
Handwheel by hand wheel and stem of the thread forward, back, raised or lowered to connect the valve plate with the stem to achieve the role of open and closed
Valve has the following advantages:
Fluid resistance is small, the sealing surface by the media, distressed small brush and erosion.
Opening and closing more labor-saving.
Medium flows unrestricted, non-spoiler, without reducing pressure.
A simple shape, structure, length short, good manufacturing processes applicable to a wide range.
Valve defects are as follows:
Between the sealing surface could easily cause erosion and abrasion, maintenance more difficult.
Overall large size, open requires a certain space, opening and closing a long time.
Structure is more complicated.
The type of gate width, according to the sealing surface configuration can be divided into wedge gate-type valve and parallel gate-type valve, wedge gate-type valve can be divided into: single-gate type, Shuangzha plate and elastic damper type; parallel gate-type valve can be divided into single-ram type and Shuangzha plate. Location by stem thread are divided into Ming and dark rod valve valve two kinds of stroke.
Valve installation and maintenance should note the following items:
Hand-wheel, handle and the transmission mechanism for lifting are not allowed to use, and are prohibited from collisions.
Shuangzha vertical plate gate valve should be installed (ie, stem in a vertical position, the hand wheel at the top).
With a bypass valve to open the valve opening should be preceded by-pass valve (in order to balance imports and exports and reducing pressure opening force).
The valve with a transmission mechanism, according to product instructions for the installation.
If you frequently switch the valve to use, lubrication at least once a month.
Structural features:
For a long time on the market with the general valve widespread the phenomenon of water leakage or rust, the introduction of European high-tech enterprise manufacturing technology of the rubber and the valve seat seal gate valve produced the flexibility to overcome the general bad valve seals, rust, etc. defects, flexible valve seat seal gate produce small quantities of elastic compensation for the role of elastic deformation to achieve a good sealing effect, the valve has a switch light, sealing, reliable, good elastic memory, and the service life of significant advantages. It can be widely used in tap water, sewage, construction, petroleum, chemical, food, medicine, textile, electric power, shipbuilding, metallurgy, energy systems, pipelines, as a regulating body and the closure device.
Gate features:
Light weight: body made of high grade cast iron ball black, lighter in weight than conventional valve to reduce the weight of about 20% to 30%, installation and maintenance easy.
Flat-type gate seat: Traditional washing pipe valve often pass as soon as a result of foreign objects such as stone, wood, cement, iron filings, and other debris deposited on the valve at the end of recess, the easily lead to the formation of leakage can not be closed tightly and the phenomenon of and flexible use of seat seal gate valve at the bottom of the pan with the water machines with the design, easy to siltation caused by debris, so that smooth flow of fluid.
Overall Package glue: gate using high quality rubber as a whole, the outsourcing of glue, Europe's leading technology allows vulcanized rubber vulcanization after the gate to ensure accurate geometry, and the rubber and solid ductile cast gate and then not easy to come off and flexible memory good. Water
Casting Valve: Valve using precision casting, precision geometry makes the body without any finish can be guaranteed within the valve sealing.
Valve has the following advantages:
1, fluid resistance is small, the sealing surface by the media, distressed small brush and erosion.
2, opening and closing more effort.
3, medium flow unrestricted, non-spoiler, without reducing pressure.
4, a simple shape, structure, length short, good manufacturing processes applicable to a wide range.
Valve defects are as follows:
1, between the sealing surface could easily cause erosion and abrasion, maintenance more difficult.
2, form large size, open requires a certain space, opening and closing a long time.
3, the structure more complex.
The type of gate width, according to the sealing surface configuration can be divided into wedge gate-type valve and parallel gate-type valve, wedge gate-type valve can be divided into: single-gate type, Shuangzha plate and elastic damper type; parallel gate-type valve can be divided into single-ram type and Shuangzha plate. Location by stem thread are divided into Ming and dark rod valve valve two kinds of stroke.
Valve installation and maintenance should note the following items:
1, hand wheels, handles and the transmission mechanism for lifting are not allowed to use, and are prohibited from collisions.
2, Shuangzha plate gate valve should be mounted vertically (ie the stem in a vertical position, the hand wheel at the top).
3, with a bypass valve opens the valve opening should be preceded by bypass valve (in order to balance imports and exports and reducing pressure opening force). Stainless steel electrode
4, with transmission of the valve, according to product instructions for the installation.
5, if the valve frequently switch the use of lubrication at least once a month.
Gate of the main criteria
(1) GB12232-89 "Link Universal Valve Flanged iron gate valves"
(2) GB12234-89 "universal valve steel gate valve connecting flange and butt"
(3) GB8486-87 "threaded connection within the gate, as valve, ball valve, check valve common technical regulations"
(4) GB8465.1-87 "threaded connection within the gate, as valve, ball valve, check valve basic size iron gate"
(5) JB/T53162-94 "Valve Product Quality Grading"
(6) JB/T5298-91 "pipeline with the steel plate gate valve"
(7) JB/Z243-85 "gate static life test procedures"
(8) JB/TQ648-88 "Flat Iron Gate on the folder"
(9) JB/T53200-94 "iron gate valve on the price of flat-panel product quality grading"
(10) JB/T53242-94 "steel plate gate valve product quality and grading"
ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve ball valve V Type Ball Valve
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Fox was in China two nuclear power valve Westinghouse orders
A few days ago, Fox won the Westinghouse Electric Company two important orders, these two projects is Westinghouse Electric Company in China AP1000TM nuclear power projects.
As early as in May last year, Fox had won the Westinghouse Electric Company for the Chinese nuclear power projects in the two isolation valves steam project orders, Westinghouse Electric Company, under a row of other orders safety-related valves, including the Westinghouse nuclear program AP1000TM of use to the main water supply valve and electrical isolation ball valve.
Fox President and CEO Lewis Kling said: "These orders show that our supply of nuclear power market is still in the lead, while strengthening our nuclear power plants in this industry for the responsibility of the supply valve and more to prove ability to meet our strict quality requirements of customers. "
The fourth quarter of 2008, the latest orders, the first electric valve AP1000TM Westinghouse nuclear reactors will be used. Electric valve orders including Fox Anchor / Darling valve, ball valve, as well as Edward Fox Fox Limitorque electric actuator. Flow Control Branch, president of Fox Tom Pajonas said, "We are very pleased to be able to access these additional Westinghouse nuclear power plant valve AP1000TM orders. As the executing agency and valve manufacturers, Fox has a remarkable ability to design, production nuclear safety-related valves and its provision of electric service. "
The new Westinghouse Electric Company Nuclear Power Plant, located in Sanmen, Zhejiang and Shandong Haiyang, expected in 2013 and will be operational in 2014. China's four nuclear power projects AP1000TM chose the Westinghouse Electric to build. 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/' target='_blank' class='infotextkey'>Knife Gate Valve .
Need, please e-mail to valve401@gmail.com
As early as in May last year, Fox had won the Westinghouse Electric Company for the Chinese nuclear power projects in the two isolation valves steam project orders, Westinghouse Electric Company, under a row of other orders safety-related valves, including the Westinghouse nuclear program AP1000TM of use to the main water supply valve and electrical isolation ball valve.
Fox President and CEO Lewis Kling said: "These orders show that our supply of nuclear power market is still in the lead, while strengthening our nuclear power plants in this industry for the responsibility of the supply valve and more to prove ability to meet our strict quality requirements of customers. "
The fourth quarter of 2008, the latest orders, the first electric valve AP1000TM Westinghouse nuclear reactors will be used. Electric valve orders including Fox Anchor / Darling valve, ball valve, as well as Edward Fox Fox Limitorque electric actuator. Flow Control Branch, president of Fox Tom Pajonas said, "We are very pleased to be able to access these additional Westinghouse nuclear power plant valve AP1000TM orders. As the executing agency and valve manufacturers, Fox has a remarkable ability to design, production nuclear safety-related valves and its provision of electric service. "
The new Westinghouse Electric Company Nuclear Power Plant, located in Sanmen, Zhejiang and Shandong Haiyang, expected in 2013 and will be operational in 2014. China's four nuclear power projects AP1000TM chose the Westinghouse Electric to build. 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/' target='_blank' class='infotextkey'>Knife Gate Valve .
Need, please e-mail to valve401@gmail.com
Interpretation of several terms on the valve
valve sealing performance is part of the sealing ability to prevent media leaks, it is the valve of the most important technical performance indicators. Valve sealing parts are three: open and close the two pieces with the valve seat sealing surface contacts between the Office; filler stem and the stuffing of the distribution and the Branch; body junctions with the valve cover. Of which the first one is called the leakage of internal leakage, which is commonly known as Guan lax, it will affect the media's ability to cut off the valve. For the cut valve, the internal leakage is not allowed. Leakage after the two called the leakage, that is, medium leaking into the valve from the valve outside. Leakage would cause material loss, environmental pollution can also cause serious accidents. For flammable and explosive, toxic or radioactive medium, leakage is inadmissible and, therefore, the valve must have a reliable sealing performance.
Mobile Media
Medium flows through the valve would cause pressure loss (both before and after the valve pressure difference), that is, the flow valve on the media have a certain resistance, medium to overcome the resistance of the valve is necessary to consume a certain energy. From the conservation of energy considerations, the design and manufacture of valves, it is necessary to minimize the resistance of the valve on the flow medium.
Headstock headstock force and torque
Hoisting force and hoisting moment is to open or close the valve that must be imposed by force or torque. Close the valve, the need to open and close with the Coma Berenices two pieces of the sealing surface of the seal formed between certain specific pressure, while also overcoming the stem and the packing between the stem and the nut thread between the stem end bearing at and other friction parts of the friction, and therefore must apply the closing force and closing a certain moment, the valve in the open and close the process, the required hoisting hoisting force and moment of change, and its maximum is close to the final instant or open the initial transient. The design and manufacture of valves should be sought to reduce the closing force and closing moments.
Hoisting Speed
Hoisting speed is used to open or close the valve to complete a movement to represent the time required. Valves open and close speeds generally no strict requirements, but some conditions the speed of the hoist have special requirements, if any, the prompt to open or closed, to prevent an accident, and some require slow and shut down to prevent the resulting water hammer, etc. , which should be considered in selection of valve type.
Action sensitivity and reliability of
This refers to the valve for the medium parameters change, the sensitivity of the response accordingly. For the throttle valve, reducing valve, regulating valve used to adjust the medium parameters of the valves, as well as safety valves, steam trap with a specific function such as valves, its function is very important to the sensitivity and reliability of the technical performance indicators.
Life
It is said that the durability of the valve is a valve key performance indicators, and has great economic significance. Usually able to ensure that the number of seals required to open and close that can also be used to indicate the use of time. 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
Mobile Media
Medium flows through the valve would cause pressure loss (both before and after the valve pressure difference), that is, the flow valve on the media have a certain resistance, medium to overcome the resistance of the valve is necessary to consume a certain energy. From the conservation of energy considerations, the design and manufacture of valves, it is necessary to minimize the resistance of the valve on the flow medium.
Headstock headstock force and torque
Hoisting force and hoisting moment is to open or close the valve that must be imposed by force or torque. Close the valve, the need to open and close with the Coma Berenices two pieces of the sealing surface of the seal formed between certain specific pressure, while also overcoming the stem and the packing between the stem and the nut thread between the stem end bearing at and other friction parts of the friction, and therefore must apply the closing force and closing a certain moment, the valve in the open and close the process, the required hoisting hoisting force and moment of change, and its maximum is close to the final instant or open the initial transient. The design and manufacture of valves should be sought to reduce the closing force and closing moments.
Hoisting Speed
Hoisting speed is used to open or close the valve to complete a movement to represent the time required. Valves open and close speeds generally no strict requirements, but some conditions the speed of the hoist have special requirements, if any, the prompt to open or closed, to prevent an accident, and some require slow and shut down to prevent the resulting water hammer, etc. , which should be considered in selection of valve type.
Action sensitivity and reliability of
This refers to the valve for the medium parameters change, the sensitivity of the response accordingly. For the throttle valve, reducing valve, regulating valve used to adjust the medium parameters of the valves, as well as safety valves, steam trap with a specific function such as valves, its function is very important to the sensitivity and reliability of the technical performance indicators.
Life
It is said that the durability of the valve is a valve key performance indicators, and has great economic significance. Usually able to ensure that the number of seals required to open and close that can also be used to indicate the use of time. 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/' target='_blank' class='infotextkey'>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
Large-diameter ball valve of the Classification and Technical Specifications
Ball valve, the valve is applied more widely, one of which appears very early, promote the use of late. It works the same as with the plug valves are rotated by the valve spool to make the hoist, but the light switch than the plug valves, relatively small size, can be made into large-diameter valves. Valve sealing reliability, simple structure, easy maintenance, sealing surface and the ball often in the closed state, can not easily be medium erosion. At present, foreign valve diameter has reached 3050cm, in petroleum, chemical industry, metallurgy, textile, food, atomic energy, aviation and other departments widely used.
1, ball valve classification
Valve is divided into two main categories: floating, fixed (see Figure 1)
a, floating ball valve
b, fixed ball valve
Figure 1 floating, fixed ball valve structure
1.1, floating ball valve
The sphere is a floating ball valve in the medium under pressure to produce a certain degree of displacement of the sphere, and pressed in the export side of the sealing surface to ensure the valve seal. Floating ball valve of simple structure, good sealing, but the ball to bear the load all the working medium to pass the export ring, so to consider the ring material can withstand the work load of the sphere medium. This structure is widely used in the low-pressure valve.
1.2, fixed ball valve
The ball valve is fixed, the pressure does not produce after the move. Fixed ball valve comes with a floating valve seat, by the medium pressure, the seat produce movement, so that pressed the ball on the ring to ensure sealing. Usually with the sphere of the upper and lower shaft bearings, operating torque is small, applied to high pressure and large-diameter valve. In order to reduce torque and increase the operation of valve sealing reliability of the valve seal has emerged in recent years, both in injection pressure between the sealing surface of a special lubricant, to form a layer of film that enhances the tightness, but also reduce operating torque, more suitable for large-diameter high-pressure valve.
This paper mainly large-diameter floating ball valve open and close the tightness of torque, etc. as shallow, hoping to be helpful for the application of ball valves.
2, floating ball valve seals
Floating ball valve of simple structure, good sealing, but the ball to bear the load all the working medium to pass the exit seal, so ring material can withstand the work load of the medium sphere is the key. In general, seals are PTFE and other flexible materials used, the composition of metal and nonmetal materials, seal pair, which is often referred to as soft-sealing. Soft seal tightness easy to guarantee, but also to seal the surface of machining accuracy and surface roughness requirements are not very high. In the medium pressure, ball to the exit of displacement and compaction seat, this time, ball pressure in the valve seat on the edge QMJ as follows:
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/' target='_blank' class='infotextkey'>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, ball valve classification
Valve is divided into two main categories: floating, fixed (see Figure 1)
a, floating ball valve
b, fixed ball valve
Figure 1 floating, fixed ball valve structure
1.1, floating ball valve
The sphere is a floating ball valve in the medium under pressure to produce a certain degree of displacement of the sphere, and pressed in the export side of the sealing surface to ensure the valve seal. Floating ball valve of simple structure, good sealing, but the ball to bear the load all the working medium to pass the export ring, so to consider the ring material can withstand the work load of the sphere medium. This structure is widely used in the low-pressure valve.
1.2, fixed ball valve
The ball valve is fixed, the pressure does not produce after the move. Fixed ball valve comes with a floating valve seat, by the medium pressure, the seat produce movement, so that pressed the ball on the ring to ensure sealing. Usually with the sphere of the upper and lower shaft bearings, operating torque is small, applied to high pressure and large-diameter valve. In order to reduce torque and increase the operation of valve sealing reliability of the valve seal has emerged in recent years, both in injection pressure between the sealing surface of a special lubricant, to form a layer of film that enhances the tightness, but also reduce operating torque, more suitable for large-diameter high-pressure valve.
This paper mainly large-diameter floating ball valve open and close the tightness of torque, etc. as shallow, hoping to be helpful for the application of ball valves.
2, floating ball valve seals
Floating ball valve of simple structure, good sealing, but the ball to bear the load all the working medium to pass the exit seal, so ring material can withstand the work load of the medium sphere is the key. In general, seals are PTFE and other flexible materials used, the composition of metal and nonmetal materials, seal pair, which is often referred to as soft-sealing. Soft seal tightness easy to guarantee, but also to seal the surface of machining accuracy and surface roughness requirements are not very high. In the medium pressure, ball to the exit of displacement and compaction seat, this time, ball pressure in the valve seat on the edge QMJ as follows:
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/' target='_blank' class='infotextkey'>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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