CN110594419A - Angle type lifting check valve - Google Patents
Angle type lifting check valve Download PDFInfo
- Publication number
- CN110594419A CN110594419A CN201910863530.1A CN201910863530A CN110594419A CN 110594419 A CN110594419 A CN 110594419A CN 201910863530 A CN201910863530 A CN 201910863530A CN 110594419 A CN110594419 A CN 110594419A
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- CN
- China
- Prior art keywords
- valve
- piston
- cylinder
- gap
- middle cavity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007789 sealing Methods 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 19
- 230000033001 locomotion Effects 0.000 claims abstract description 10
- 230000003028 elevating effect Effects 0.000 claims abstract description 3
- 239000012530 fluid Substances 0.000 claims description 12
- 238000004804 winding Methods 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 abstract description 3
- 238000013016 damping Methods 0.000 description 16
- 239000000956 alloy Substances 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 8
- 238000003466 welding Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000004429 Calibre Substances 0.000 description 1
- 241000220317 Rosa Species 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000941 radioactive substance Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0209—Check valves or pivoted valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
- Check Valves (AREA)
Abstract
The invention relates to an angle type lifting check valve which is suitable for a main water supply pipeline at a Steam Generator (SG) of a nuclear power station and belongs to the field of machinery; the upper part of the valve body is provided with a piston motion assembly and a middle cavity sealing assembly, the piston motion assembly comprises a valve clack and a piston, and the middle cavity sealing assembly comprises a valve cover and a cylinder sleeve assembly; fixed valve gap can be dismantled on valve body upper portion, the inside side-mounting cylinder liner subassembly of valve body, valve clack upper portion fixed connection piston, form the lumen between valve gap and the cylinder liner subassembly, the piston drives the valve clack and makes elevating movement at the lumen, be provided with the water conservancy diversion hole on the cylinder liner subassembly, water conservancy diversion hole one end UNICOM lumen, the gap between other end UNICOM cylinder liner subassembly and the valve body. The check valve not only can keep a normal opening function, but also prevents the downstream pipeline from being broken due to the fact that overlarge water hammer force is generated in the closing process under the abnormal or accident working condition, so that the water hammer influence in the rapid closing process is reduced.
Description
Technical Field
The invention relates to a special valve designed under the conditions of high temperature and high pressure, in particular to a high-pressure large-caliber angle type lifting check valve with a piston cylinder damping structure, which is suitable for a main water supply pipeline at a Steam Generator (SG) of a nuclear power station and belongs to the field of machinery.
Background
At present, all the angle type lifting main water supply check valves of high-pressure large-caliber springs and piston cylinder damping structures in China are imported, and the localization of nuclear power equipment becomes a national industrial policy.
The angle type lifting check valve is arranged at the position, close to a Steam Generator (SG), of a main water supply pipeline, and SG emptying and radioactive substance leakage under the accident working condition are prevented. In order to prevent the downstream pipeline from cracking due to excessive water hammer force generated in the closing process, the check valve is provided with a damping device to reduce the water hammer influence in the rapid closing process, and the conventional angle type lifting check valve is lack of a necessary damping device.
The valve is a high-pressure large-caliber valve, and not only meets the requirement of normal working conditions, but also meets the requirement of minimum volume flow (more than 456 m)3The pressure is 7.5MPa, and the function requirement of slow closing is carried out within 0.4 ~ 0.9 second (pressure difference is 7.9 MPa).
Disclosure of Invention
The invention aims to provide an angle type lifting check valve of a high-pressure large-caliber spring and piston cylinder damping structure, which not only can keep a normal opening function, but also can prevent a downstream pipeline from being broken due to overlarge water hammer force generated in the closing process under abnormal or accident working conditions (the breakage of an upstream main water supply pipeline) so as to reduce the water hammer influence in the rapid closing process.
In order to achieve the purpose, the invention adopts the technical scheme that: the angle type lifting check valve comprises a valve body, wherein a piston motion assembly and a middle cavity sealing assembly are arranged at the upper part of the valve body, the piston motion assembly comprises a valve clack and a piston, and the middle cavity sealing assembly comprises a valve cover and a cylinder sleeve assembly; fixed valve gap can be dismantled on valve body upper portion, the inside side-mounting cylinder liner subassembly of valve body, valve clack upper portion fixed connection piston, form the lumen between valve gap and the cylinder liner subassembly, the piston drives the valve clack and makes elevating movement at the lumen, be provided with the water conservancy diversion hole on the cylinder liner subassembly, water conservancy diversion hole one end UNICOM lumen, the gap between other end UNICOM cylinder liner subassembly and the valve body.
Based on the technical scheme, the damping structure of the piston cylinder is adopted, the flow guide hole is additionally arranged, and damping is generated by utilizing the principle that liquid is not compressible, so that the water hammer influence in the rapid closing process is reduced, and the downstream pipeline is prevented from being broken due to the fact that excessive water hammer force is generated in the closing process.
Further, a spring is arranged between the piston and the cylinder sleeve assembly.
Based on above-mentioned technical scheme, the spring is in compression state all the time, and when the valve clack rose and opened, the spring had ascending elasticity to the piston to make the valve clack open more easily, when the valve clack closed downwards, the spring can play certain cushioning effect, further reduces the water hammer influence of quick closure in-process.
Further, the cylinder liner assembly includes a cylinder and a sleeve that is threaded to the inside of the cylinder.
Based on above-mentioned technical scheme, the inboard upper portion and the lower part of cover all carry out build-up welding and handle, improve the wear resistance with valve clack contact department, reduce frictional resistance, improve life.
Preferably, a spring is arranged between the piston and the cylinder, one end of the spring is sleeved on a limiting bulge at the bottom of the piston, and the other end of the spring extends into a gap between the cylinder and the sleeve and is sleeved on the limiting bulge on the cylinder.
Based on above-mentioned technical scheme, the spring is in compression state all the time, and it is spacing between piston and jar all the time.
Preferably, the upper part of the middle cavity is a reducing arc surface, the lower part of the middle cavity is a non-reducing arc surface, and the flow guide holes are formed in the reducing arc surface.
Based on the technical scheme, the variable-diameter cambered surface is a conical surface with a large upper part and a small lower part, and the non-variable-diameter cambered surface is a cylindrical surface which is straight from the upper part to the lower part. The lower part surface of piston is to the in-process of water conservancy diversion hole and conical surface bottommost, and the fluid still can pass through until the piston falls to the cambered surface scope of not becoming the footpath, and the piston cooperatees with the cambered surface of not becoming the footpath, and the fluid no longer passes through from the water conservancy diversion hole, and the shearing force that sets up like this and dams is littleer, and the valve life-span increases. And the closing time can be adjusted by setting the size of the conical surface.
Preferably, a sealing ring and a winding gasket are arranged between the valve cover and the valve body. Specifically, an annular convex ring is arranged on the inner side edge of the bottom of the valve cover and is pressed on the upper portion of the cylinder sleeve assembly through an annular sealing ring, and a winding gasket is arranged between the valve cover and the valve body.
Based on above-mentioned technical scheme, the sealing washer sets up between valve gap, valve body and jar three, and the valve gap adopts multiple compound seal structure form, has both guaranteed the sealing reliability of lumen, plays the effect of compressing tightly the jar again and fixing to the valve body.
The mounting flange can be dismantled on valve gap upper portion, has the flange sealing washer between valve gap and the flange.
Based on above-mentioned technical scheme, the valve gap upper end is equipped with the flange, passes through bolted connection with the valve gap, can realize the requirement of functions such as detection and observation.
By adopting the using method of the angle type lifting check valve, the valve clack descends, and in the first stage: the valve clack drives the piston to descend in the middle cavity, and fluid at the lower part of the piston in the middle cavity enters the outlet cavity of the valve from the middle cavity through the diversion hole along a gap between the cylinder sleeve assembly and the valve body; and a second stage: when the piston is lowered to the position of the guide hole, the fluid at the lower part of the piston in the middle cavity enters the outlet cavity of the valve through the gap between the valve clack and the sleeve.
Furthermore, by adopting the use method of the angle type lifting check valve, the spring has upward acting force on the piston, the valve clack rises, and the valve clack drives the piston to rise in the middle cavity; the valve flap descends, and in the first stage: the valve clack drives the piston to descend in the middle cavity, and fluid at the lower part of the piston in the middle cavity enters the outlet cavity of the valve from the middle cavity through the diversion hole along a gap between the cylinder sleeve assembly and the valve body; and a second stage: the piston descends to the position of the flow guide hole, fluid at the lower part of the piston in the middle cavity enters the outlet cavity of the valve through a gap between the valve clack and the sleeve, and in the process, the spring is further compressed.
Further description of the invention: the design pressure is satisfied: 8.9MPa, design temperature: 303 ℃, working medium: water supply and design life: 60 years (excluding wearing parts), cycle life: 5672 times, maximum flow: greater than 2814.7 m3/h (corresponding to the temperature: 228 ℃ and the pressure: 7.1 MPa), flow coefficient (Cv > 2512) and full-open minimum volume flow (greater than 456 m)3The valve body structure is integrally forged in a full-bore way, the flow capacity is increased, and the integrity of a pressure boundary under high temperature and high pressure is ensured, the damping structure design of the piston cylinder with the spring is adopted, the weight of the piston is reduced, the spring is used as an auxiliary opening force, so that the valve simultaneously meets the control requirements of full-opening minimum volume flow (more than 456m3/h, corresponding to the temperature of 134 ℃, the pressure of 7.5 MPa) and damping slow closing (closing time of 0.4 ~.9 seconds and pressure difference of 7.9 MPa), a flow guide hole and a speed control section structure design are additionally arranged on the cylinder, the adjustment and control of closing speed are realized, the structural design of a guide sleeve of the surfacing welding hard alloy, namely the sleeve of the cylinder sleeve assembly improves the wear resistance of a contact part of the valve clack, reduces friction, prolongs the service life, the profile design of the valve clack with the surfacing welding hard alloy, ensures the accurate flow control under low opening, and the flow control of a controlled damping system is controlled, so that the flow control system controls the flow of the valve clackThe pressure fluctuation value is effectively reduced. The hard alloy is surfacing-welded on the low-opening flow control surface of the valve clack, so that the flushing resistance is improved. And the hard alloy is welded on the sealing surface, so that good sealing performance is ensured.
The invention has the beneficial effects that: the check valve not only can keep a normal opening function, but also can prevent the downstream pipeline from being broken due to the fact that overlarge water hammer force is generated in the closing process under abnormal or accident working conditions (the upstream main water supply pipeline is broken), so that the water hammer influence in the rapid closing process is reduced.
Drawings
FIG. 1 is a front view structural diagram of the present invention;
FIG. 2 is an enlarged view of a portion I of FIG. 1;
FIG. 3 is an enlarged view of a portion II of FIG. 1;
in the figure, 1, a valve body, 2, a valve seat, 3, a valve clack, 4, a cylinder, 5, a sleeve, 6, a spring, 7, a locking pad, 8, a nut, 9, a piston, 10, a nameplate, 11, a rivet, 12, a bonnet bolt, 13, a locking gasket, 14, a bonnet nut, 15, an eyebolt, 16, a flange bolt, 17, a flange nut, 18, a locking gasket, 19, a flange, 20, a flange sealing ring, 21, a bonnet, 22, a winding gasket, 23, a sealing ring, A, surfacing welding, B, welding, 24, a middle cavity, 25 and a diversion hole.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The utility model provides a special valve of design under high temperature, high pressure condition, specifically relates to high pressure heavy-calibre has angle formula lift check valve of piston cylinder damping structure, is applicable to on the main water supply line of nuclear power station Steam Generator (SG) department, belongs to machinery.
As shown in the angle type lifting check valve with the spring and piston cylinder damping structure shown in the figures 1-3, a full-bore integrally forged valve body 1 is a valve main body part; the valve seat 2 and the valve body 1 are connected into a whole through welding; the cylinder 4 and the sleeve 5 are connected and fixed through threads; the upper part of the valve clack 3 is in threaded connection with a nut 8 to fix a piston 9 and the valve clack 3, a locking pad 7 is arranged between the nut 8 and the piston 9, and a spring 6 is arranged between the piston 9 and the cylinder 4, so that the valve clack 3, the piston 9, the spring 6 and the locking pad 7 form a piston motion assembly.
The piston 9 and the cylinder 4, the valve clack 3 and the valve seat 2 and the spring 6 form a damping device; the valve cover 21 is connected with the valve body 1 through the bolt 12, the anti-loosening gasket 13 and the nut 14, and multiple sealing is formed by the sealing ring 23 and the winding gasket 22, so that the sealing reliability of the middle cavity 24 is ensured. The flange 19 is fixed on the valve cover 21 through the flange bolt 16, the flange nut 17 and the anti-loosening gasket 18, so that the functions of detection, observation and the like are realized, and the flange sealing ring 20 plays a sealing role.
The valve body 1 adopts a process mode of integrally forging the valve body with a full drift diameter, and the integral performance of materials and the integrity of the integral pressure boundary of the valve are ensured.
The cover 5 has a structural design of surfacing hard alloy, so that the wear resistance of the contact part of the cover and the valve clack 3 is improved, and the friction resistance is reduced.
The valve clack 3 is provided with a low-opening flow control profile design of surfacing hard alloy, the medium flow cross section area of the valve clack 3 and the valve seat 2 is accurately controlled according to different opening degrees of the valve clack 3, the accurate flow control under the low opening degree is ensured, and therefore the pressure fluctuation value is effectively reduced under the action of the controlled damping system. The hard alloy is surfacing-welded on the low-opening flow control surface of the valve clack 3, so that the flushing resistance is improved. And the hard alloy is welded on the sealing surface, so that good sealing performance is ensured.
The damping device is composed of a piston 9, a cylinder 4, a spring 6, a valve clack 3 and a valve seat 2, so that the valve can simultaneously meet the full-open minimum volume flow (more than 456 m)3The control requirements of 134 ℃ of temperature, 7.5MPa of pressure and slow closing with damping (closing time of 0.4 ~ 0.9.9 seconds and pressure difference of 7.9 MPa) are met, wherein the flow guide hole 25 and the speed control section structure design are additionally arranged on the cylinder 4, and the low-opening flow control profile of the valve clack 3 can realize the adjustment and control of the closing speed.
The middle cavity sealing assembly is of a multiple sealing structure, the sealing ring 23 and the winding gasket 22 are combined in different sealing forms to form multiple sealing, the sealing reliability of the middle flange is guaranteed, the valve cover sealing ring 23 serves as an intermediate structural member, and the effect that the cylinder 4 is pressed and fixed on the valve body 1 through the valve cover 21 is achieved.
The flange 19 can realize the functions of detection, observation and the like.
By adopting the use method of the angle type lifting check valve, the valve clack 3 rises, the spring 6 has upward acting force on the piston 9, and the valve clack 3 drives the piston 9 to rise in the middle cavity 24; the valve flap 3 descends, the first phase: the valve clack 3 drives the piston 9 to descend in the middle cavity 24, and fluid at the lower part of the piston 9 in the middle cavity 24 enters an outlet cavity of the valve from the middle cavity 24 through a diversion hole 25 along a gap between the cylinder 4 and the valve body 1; and a second stage: the piston 9 descends to the position of the diversion hole 25, and the fluid in the lower part of the piston 9 in the middle chamber 24 enters the outlet chamber of the valve from the gap between the valve clack 3 and the sleeve 5, and in the process, the spring 6 is further compressed.
Claims (10)
1. Angle formula lift check valve, including the valve body, its characterized in that: the upper part of the valve body is provided with a piston motion assembly and a middle cavity sealing assembly, the piston motion assembly comprises a valve clack and a piston, and the middle cavity sealing assembly comprises a valve cover and a cylinder sleeve assembly; fixed valve gap can be dismantled on valve body upper portion, the inside side-mounting cylinder liner subassembly of valve body, valve clack upper portion fixed connection piston, form the lumen between valve gap and the cylinder liner subassembly, the piston drives the valve clack and makes elevating movement at the lumen, be provided with the water conservancy diversion hole on the cylinder liner subassembly, water conservancy diversion hole one end UNICOM lumen, the gap between other end UNICOM cylinder liner subassembly and the valve body.
2. The angle-lift check valve of claim 1, wherein: and a spring is arranged between the piston and the cylinder sleeve assembly.
3. The angle-lift check valve of claim 1, wherein: the cylinder sleeve assembly comprises a cylinder and a sleeve, and the sleeve is connected to the inner side of the cylinder through threads.
4. The angle-lift check valve of claim 3, wherein: a spring is arranged between the piston and the cylinder, one end of the spring is sleeved on the limiting protrusion at the bottom of the piston, and the other end of the spring extends into a gap between the cylinder and the sleeve and is sleeved on the limiting protrusion on the cylinder.
5. The angle-lift check valve of claim 2 or 4, wherein: the spring is always in a compressed state.
6. The angle-lift check valve of claim 1, wherein: the upper part of the middle cavity is a conical surface, and the flow guide holes are formed in the conical surface.
7. The angle-lift check valve of claim 1, wherein: the inner side edge of the bottom of the valve cover is provided with an annular convex ring, the annular convex ring is pressed on the upper portion of the cylinder sleeve assembly through an annular sealing ring, and a winding gasket is arranged between the valve cover and the valve body.
8. The angle-lift check valve of claim 1, wherein: the mounting flange can be dismantled on valve gap upper portion, has the flange sealing washer between valve gap and the flange.
9. Use of the angle-lift check valve as set forth in claim 3, wherein: the valve flap descends, and in the first stage: the valve clack drives the piston to descend in the middle cavity, and fluid at the lower part of the piston in the middle cavity enters the outlet cavity of the valve from the middle cavity through the diversion hole along a gap between the cylinder sleeve assembly and the valve body; and a second stage: when the piston is lowered to the position of the guide hole, the fluid at the lower part of the piston in the middle cavity enters the outlet cavity of the valve through the gap between the valve clack and the sleeve.
10. Use of the angle-lift check valve as set forth in claim 4, wherein: the valve clack rises, the spring has upward acting force on the piston, and the valve clack drives the piston to rise in the middle cavity; the valve flap descends, and in the first stage: the valve clack drives the piston to descend in the middle cavity, and fluid at the lower part of the piston in the middle cavity enters the outlet cavity of the valve from the middle cavity through the diversion hole along a gap between the cylinder sleeve assembly and the valve body; and a second stage: the piston descends to the position of the flow guide hole, fluid at the lower part of the piston in the middle cavity enters the outlet cavity of the valve through a gap between the valve clack and the sleeve, and in the process, the spring is further compressed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910863530.1A CN110594419A (en) | 2019-09-12 | 2019-09-12 | Angle type lifting check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910863530.1A CN110594419A (en) | 2019-09-12 | 2019-09-12 | Angle type lifting check valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110594419A true CN110594419A (en) | 2019-12-20 |
Family
ID=68859476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910863530.1A Pending CN110594419A (en) | 2019-09-12 | 2019-09-12 | Angle type lifting check valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110594419A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR416290A (en) * | 1910-05-24 | 1910-10-15 | Paul Revere Mccoy | Rotary machine |
| GB700821A (en) * | 1951-05-29 | 1953-12-09 | Nat Res Dev | Improvements in or relating to fluid pressure engines of the uniflow type |
| CN203836293U (en) * | 2014-01-17 | 2014-09-17 | 哈电集团哈尔滨电站阀门有限公司 | Novel check valve controlled to be closed |
| CN207195820U (en) * | 2017-09-05 | 2018-04-06 | 陕西泰科泵阀科技有限公司 | A kind of delayed on-off non-return valve |
| CN209325068U (en) * | 2018-12-26 | 2019-08-30 | 浙江天特阀门有限公司 | A kind of damping slow-closing type lift check valve |
| CN210484631U (en) * | 2019-09-12 | 2020-05-08 | 大连大高阀门股份有限公司 | Angle type lifting check valve |
-
2019
- 2019-09-12 CN CN201910863530.1A patent/CN110594419A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR416290A (en) * | 1910-05-24 | 1910-10-15 | Paul Revere Mccoy | Rotary machine |
| GB700821A (en) * | 1951-05-29 | 1953-12-09 | Nat Res Dev | Improvements in or relating to fluid pressure engines of the uniflow type |
| CN203836293U (en) * | 2014-01-17 | 2014-09-17 | 哈电集团哈尔滨电站阀门有限公司 | Novel check valve controlled to be closed |
| CN207195820U (en) * | 2017-09-05 | 2018-04-06 | 陕西泰科泵阀科技有限公司 | A kind of delayed on-off non-return valve |
| CN209325068U (en) * | 2018-12-26 | 2019-08-30 | 浙江天特阀门有限公司 | A kind of damping slow-closing type lift check valve |
| CN210484631U (en) * | 2019-09-12 | 2020-05-08 | 大连大高阀门股份有限公司 | Angle type lifting check valve |
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