CN110030412B - Large-caliber multi-stage pilot operated safety valve - Google Patents
Large-caliber multi-stage pilot operated safety valve Download PDFInfo
- Publication number
- CN110030412B CN110030412B CN201910206971.4A CN201910206971A CN110030412B CN 110030412 B CN110030412 B CN 110030412B CN 201910206971 A CN201910206971 A CN 201910206971A CN 110030412 B CN110030412 B CN 110030412B
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- main valve
- main
- clack
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- 238000007789 sealing Methods 0.000 claims abstract description 24
- 238000003466 welding Methods 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 229910017052 cobalt Inorganic materials 0.000 claims description 5
- 239000010941 cobalt Substances 0.000 claims description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 5
- 238000005336 cracking Methods 0.000 claims description 5
- 230000002776 aggregation Effects 0.000 claims description 3
- 238000004220 aggregation Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910001347 Stellite Inorganic materials 0.000 description 2
- AHICWQREWHDHHF-UHFFFAOYSA-N chromium;cobalt;iron;manganese;methane;molybdenum;nickel;silicon;tungsten Chemical compound C.[Si].[Cr].[Mn].[Fe].[Co].[Ni].[Mo].[W] AHICWQREWHDHHF-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002035 prolonged effect Effects 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
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
-
- 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
- F16K1/42—Valve seats
-
- 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
- F16K1/46—Attachment of sealing rings
-
- 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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/08—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for providing a large discharge passage
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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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/10—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with auxiliary valve for fluid operation of the main valve
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
- Lift Valve (AREA)
Abstract
The invention relates to a large-caliber multistage pilot-operated safety valve, which belongs to the field of electric power, petrochemical industry and the like. The main valve consists of main valve body, main valve seat, main valve clack, main valve guide sleeve, main valve spring, main valve cover, primary pilot valve and secondary pilot valve. The inlet of the main valve body is communicated with the upper part of the main valve clack, the outlet side of the valve body is communicated with the lower part of the sealing surface of the main valve clack, and the outer circumferential surface of the main valve clack is not required to be provided with a sealing ring. When the medium is over-pressure, the primary pilot valve is opened, the medium discharged by the primary pilot valve enters a piston cavity of the secondary pilot valve, the secondary pilot valve is pushed to be opened, the medium in the upper cavity of the valve clack of the main valve is rapidly discharged, the valve clack of the main valve is pushed by the medium at the inlet of the valve to move upwards in the guide sleeve, and the main valve is opened to discharge the medium.
Description
Technical Field
The invention relates to a large-caliber multistage pilot-operated safety valve, and belongs to valves in the fields of electric power, petrochemical industry and the like.
Background
The safety valve with large discharge amount required in the fields of electric power, petrochemical industry and the like usually adopts a pilot-operated safety valve which consists of a main valve and a pilot valve. The valve clack of the main valve moves up and down in the guide sleeve of the main valve in the working process of the existing large-caliber pilot type safety valve, so that the opening and closing of the main valve and the discharge of medium are realized. The pilot valve is a spring direct acting safety valve for controlling the opening and closing of the main valve. The pilot-operated safety valve disclosed by the utility model patent grant publication No. CN 205781142U and the utility model patent grant publication No. CN 201753791U is characterized in that an O-shaped ring or a lip-shaped sealing ring is adopted between a main valve clack and a main valve guide sleeve, and the O-shaped ring or the lip-shaped sealing ring is easy to age, wear or damage, and the sealing property and the service life of the valve are seriously affected. The above problems are to be solved.
Disclosure of Invention
The invention aims to provide a large-caliber multi-stage pilot safety valve, which comprises a primary pilot valve, a secondary pilot valve and a main valve, wherein the primary pilot valve and the secondary pilot valve are arranged on a main valve cover. The invention solves the problems of main valve leakage, main valve clack jam and the like.
The technical scheme of the invention provides a large-caliber multi-stage pilot type safety valve, which comprises a main valve body (1), a main valve seat (2), a main valve clack (3), a main valve guide sleeve (4), a main valve spring (5), a main valve cover (6), a primary pilot valve (7), a secondary pilot valve (8), a steam exhaust pipe (9) and the like.
The primary pilot valve is a spring direct acting type safety valve and a back pressure balance type structure. The valve mainly comprises a primary valve body (701), a primary valve seat (702), an upper adjusting ring (703), a primary valve guide sleeve (704), a primary valve spring (705), a primary valve spring cover (706), a primary valve rod (707), an adjusting screw (708), a balance piston (709), a lower adjusting ring (710), a primary valve steam exhaust pipe (711), a primary valve clack (712) and other parts. The valve clack moves up and down in the guide sleeve to realize the opening and closing of the valve, and the adjusting screw (708) changes the compression amount of the spring so as to adjust the tripping pressure of the valve; the upper adjusting ring and the lower adjusting ring change the flow direction of the medium and adjust the jump pressure and the opening and closing pressure difference of the valve; the valve is provided with a balance piston which is integrated with the valve rod, so that the influence of back pressure change on the action performance of the valve is prevented; the inlet of the valve is connected with the inlet of the main valve, when the medium is over-pressure, the thrust of the medium acting on the valve clack is larger than the spring force, and the pilot valve is opened once.
The secondary pilot valve (8) is of a check structure and mainly comprises a lock nut (801), a piston (802), a secondary valve spring (803), a secondary valve rod (804), a secondary valve outlet (805), a secondary valve seat (806), a secondary valve clack (807), a secondary valve body (808) and other parts. The piston cavity of the secondary pilot valve is communicated with the outlet of the primary pilot valve, the inlet of the secondary pilot valve is communicated with the upper cavity of the valve clack of the main valve, the outlet of the secondary pilot valve is communicated with the outlet of the main valve through a steam exhaust pipe (9), and the valve body of the secondary pilot valve and the valve body of the primary valve are of an integrated structure. The valve rod of the secondary valve is connected with the valve clack and the piston, and under the normal working state, the spring force and the medium force assist the valve clack of the secondary valve to seal; after the primary pilot valve is opened, the discharged medium enters a piston cavity of the secondary valve, the thrust of the medium acting on the piston is larger than the medium force of the medium acting on the valve clack of the upper cavity of the main valve clack and the spring force, and the secondary pilot valve is opened.
The valve seat of the main valve is welded with the valve body, and is provided with two circular R-shaped anti-cracking grooves, so that cracks are prevented from being generated during welding and cold-hot alternation; the sealing surface of the valve seat is overlaid with cobalt-based hard alloy (Stellite), and the thickness of the cobalt-based hard alloy layer is larger than 6mm. The outer circle of the valve clack of the main valve is provided with a plurality of balance grooves, and after the safety valve is opened, a medium is subjected to pressure equalization through the balance grooves, so that centering in the action process of the valve clack is ensured, and the sealing of the valve is ensured; the sealing surface of the valve clack of the main valve is provided with a lip-shaped sealing pair, an aggregation groove and a supporting surface, and the angle a2 is larger than the angle a1; a 45-degree drain hole is arranged at the lowest part of the main valve clack to drain condensed water; the upper part of the valve clack is provided with a spring to assist the valve to close. After the secondary pilot valve is opened, medium in the upper cavity of the valve clack of the main valve is rapidly discharged, the medium pressure at the lower part of the valve clack of the main valve is larger than the medium pressure in the upper cavity of the valve clack, the medium pushes the valve clack to rapidly move upwards in the guide sleeve, and the valve is opened.
The beneficial effects of the invention are as follows: according to the large-caliber multi-stage pilot type safety valve, the inlet of the main valve body is communicated with the upper part of the main valve clack, the outlet side of the valve body is communicated with the lower part of the sealing surface of the main valve clack, and the outer circumferential surface of the main valve clack is not required to be provided with a sealing ring, so that the service life and the sealing performance of the valve are greatly prolonged.
Drawings
FIG. 1 is a schematic structural view of a large-caliber multi-stage pilot operated safety valve
FIG. 2 is a schematic diagram of the structure of a primary pilot valve and a secondary pilot valve
FIG. 3 is a schematic structural view of a main valve flap
FIG. 4 is a schematic structural view of a main valve seat
In the drawings, 1, a main valve body, 2, a main valve seat, 3, a main valve flap, 301, a drain hole, 302, a balance groove, 303, a lip seal pair, 304, a nesting groove, 305, a support surface, 4, a main valve guide sleeve, 5, a main valve spring, 6, a main valve cover, 7, a primary pilot valve, 701, a primary valve body, 702, a primary valve seat, 703, an upper adjustment ring, 704, a primary valve guide sleeve, 705, a primary valve spring, 706, a primary valve spring cover, 707, 708, an adjustment screw, 709, a primary valve piston, 710, a lower adjustment ring, 711, a primary valve drain, 712, a primary valve flap, 8, a secondary valve, 801, a lock nut, 802, a secondary valve piston, 803, a secondary valve spring, 804, a secondary valve stem, 805, a secondary valve outlet, 806, a secondary valve seat, 807, a secondary valve flap, 808, a secondary valve body, 9, a drain pipe, 10, weld anti-cracking grooves A, 11.
Detailed Description
In the embodiments shown in fig. 1, 2,3 and 4, the large-caliber multi-stage pilot type safety valve of the invention is a two-stage pilot type safety valve, and comprises a main valve body (1), a main valve seat (2), a main valve clack (3), a main valve guide sleeve (4), a main valve spring (5), a main valve cover (6), a primary pilot valve (7), a secondary pilot valve (8), a steam exhaust pipe (9) and the like, wherein the primary pilot valve and the secondary pilot valve are arranged on the main valve cover. When the medium is over-pressure, the primary pilot valve is opened, the discharged medium enters the piston cavity of the secondary pilot valve, the piston is pushed to drive the valve clack of the secondary valve to move downwards, the secondary pilot valve is opened, the medium in the upper cavity of the valve clack of the main valve is rapidly released, the pressure of the medium in the upper cavity of the valve clack of the main valve is rapidly reduced and is far lower than that of the medium at the lower part of the valve clack, the valve clack of the main valve is rapidly moved upwards under the pushing of the medium force, and the main valve is opened to discharge the medium.
As shown in fig. 2, the primary pilot valve is a spring direct acting safety valve, and the primary pilot valve inlet is connected to the inlet of the main valve. It is mainly composed of the following parts: the valve comprises a primary valve body (701), a primary valve seat (702), an upper adjusting ring (703), a primary valve guide sleeve (704), a primary valve spring (705), a primary valve spring cover (706), a primary valve rod (707), an adjusting screw (708), a balance piston (709), a lower adjusting ring (710), a primary valve steam exhaust pipe (711) and a primary valve clack (712). The primary pilot valve is of a back pressure balance type structure, a balance piston (709) is arranged, the balance piston (709) and a valve rod (707) are of an integrated structure, the back pressure of the valve is balanced, the valve action performance is kept stable, and the steam exhaust pipe is communicated with the inner cavity of the spring cover and the outlet of the secondary pilot valve; the valve is provided with an upper adjusting ring and a lower adjusting ring, the upper adjusting ring is used for adjusting the valve take-off precision by changing the medium flow direction to adjust the valve opening and closing pressure difference. The spring cover is provided with an adjusting screw, and the valve tripping pressure is adjusted by changing the compression amount of the spring. The spring compresses the valve clack through the valve rod, the spring force is larger than the medium force in the working state, and the valve is closed and sealed; when the medium exceeds the set pressure, the medium force is larger than the spring force, the valve clack is pushed to move upwards in the guide sleeve, the primary pilot valve is opened, and the discharged medium enters the piston cavity of the secondary pilot valve through the valve outlet.
As shown in fig. 2, the secondary pilot valve (8) has a non-return structure and mainly comprises a lock nut (801), a piston (802), a secondary valve spring (803), a secondary valve rod (804), a secondary valve outlet (805), a secondary valve seat (806), a secondary valve flap (807), a secondary valve body (808) and the like. The secondary valve rod (804) and the valve clack (807) are of an integrated structure, the secondary valve rod (804) is connected with the piston (802) through a lock nut (801), a spring (803) is arranged below the piston (802), and the spring force and the medium force assist the sealing of the secondary valve clack; the secondary valve body (808) and the primary valve body (701) are of an integrated structure, and the valve body compresses the secondary valve seat; the piston cavity of the secondary pilot valve is communicated with the primary pilot valve outlet, the inlet of the secondary pilot valve is communicated with the upper cavity of the valve clack of the main valve, and the secondary valve outlet (805) is communicated with the main valve outlet through a steam exhaust pipe (9). After the primary pilot valve is opened, the discharged medium enters a piston cavity of the secondary valve, the thrust of the medium acting on the piston is larger than the medium force of the medium acting on the valve clack of the upper cavity of the main valve clack and the spring force, and the secondary pilot valve is opened.
The main valve consists of a main valve body (1), a main valve seat (2), a main valve clack (3), a main valve guide sleeve (4), a main valve spring (5), a main valve cover (6) and the like. As shown in fig. 4, the main valve seat is provided with two circular R-shaped anti-cracking grooves, and the valve seat is connected with the main valve body in a welding way; the sealing surface of the valve seat is overlaid with cobalt-based hard alloy (Stellite), and the thickness H of the cobalt-based hard alloy layer is larger than 6mm. As shown in fig. 3, the outer circle of the main valve clack 3 is provided with a plurality of balance grooves 302, and after the safety valve is opened, the clack is ensured to act centrally; the sealing surface of the main valve clack 3 is provided with a lip seal pair 303, an aggregation groove 304 and a supporting surface 305, the angle a2 of the lip seal pair 303 is larger than the angle a1, and when the valve is closed, a medium compresses the lip seal pair 303 to ensure the valve to be sealed; when the valve is tripped, the medium leaked earlier is collected in the collecting tank 304 to enable the valve to be opened quickly; when the valve returns to the seat, the supporting surface contacts with the valve seat to bear the impact force, so that the lip seal pair 303 is effectively prevented from deforming. The lowest part of the main valve clack 3 is provided with a 45-degree drain hole 301 for draining condensed water and preventing water accumulation in the upper cavity of the clack. The upper part of the valve clack is provided with a spring to assist the valve to close. After the secondary pilot valve is opened, medium in the upper cavity of the valve clack of the main valve is quickly discharged, so that the pressure of medium at the lower part of the valve clack of the main valve is larger than that of medium in the upper cavity of the valve clack, the medium pushes the valve clack to quickly move upwards in the guide sleeve, the valve is opened, and the medium in the container is discharged.
Claims (3)
1. The large-caliber multi-stage pilot type safety valve mainly comprises a main valve body (1), a main valve seat (2), a main valve clack (3), a main valve guide sleeve (4), a main valve spring (5), a main valve cover (6), a primary pilot valve (7), a secondary pilot valve (8) and a steam exhaust pipe (9); the primary pilot valve (7) and the secondary pilot valve (8) are arranged on a main valve cover, the main valve body (1) is connected with the main valve seat (2) in a welding way, the primary pilot valve (7) comprises a primary valve body (701), a primary valve seat (702), an upper adjusting ring (703), a primary valve guide sleeve (704), a primary valve spring (705), a primary valve spring cover (706), a primary valve rod (707), an adjusting screw (708), a balance piston (709), a lower adjusting ring (710), a primary valve steam exhaust pipe (711) and a primary valve clack (712), the primary valve clack (712) moves up and down in the primary valve guide sleeve (704) to realize the opening and closing of the primary pilot valve (7), and the adjusting screw (708) is used for changing the compression amount of the primary valve spring (705), so as to adjust the tripping pressure of the primary pilot valve (7); the upper adjusting ring (703) and the lower adjusting ring (710) are used for changing the flow direction of the medium and adjusting the take-off pressure and the opening and closing pressure difference of the primary pilot valve (7); the balance piston (709) and the primary valve rod (707) are of an integrated structure, so that the influence of back pressure change on the valve action performance is prevented; the inlet of the primary valve body (701) is connected with the inlet of the main valve, when the medium is in overpressure, the thrust of the medium acting on the primary valve clack (712) is larger than the spring force of the primary valve spring (705), the primary pilot valve (7) is opened, the inlet of the primary pilot valve (7) is connected with the inlet of the main valve body (1), the secondary pilot valve (8) comprises a lock nut (801), a piston (802), a secondary valve spring (803), a secondary valve rod (804), a secondary valve outlet (805), a secondary valve seat (806), a secondary valve clack (807) and a secondary valve body (808), the piston cavity of the secondary pilot valve (8) is communicated with the outlet of the primary pilot valve (7), the outlet of the secondary pilot valve (8) is communicated with the outlet of the main valve body (1) through a steam exhaust pipe (9), the inlet of the main valve body (1) is communicated with the upper part of the main valve (3), the outlet side of the main valve body (1) is communicated with the lower part of the main valve (3), and a drain hole of 45 degrees is arranged at the lowest sealing surface (3) of the valve clack; the sealing surface of the main valve clack (3) is provided with a lip-shaped sealing pair (303), an aggregation groove (304) and a supporting surface (305), and when the valve is closed, a medium compresses the lip-shaped sealing pair (303) to ensure the sealing of the valve; when the valve is tripped, the medium leaked earlier is collected in the collecting groove (304) to enable the valve to be opened quickly; when the valve is in a back seat, the supporting surface (305) is contacted with the main valve seat (2) to bear impact force, so that the lip-shaped sealing pair (303) is effectively prevented from deforming.
2. The large-caliber multi-stage pilot operated safety valve according to claim 1, wherein: the main valve seat (2) is provided with a circular welding anti-cracking groove A and a circular welding anti-cracking groove B; the thickness H of the cobalt-based hard alloy layer of the surfacing welding of the sealing surface of the valve seat is more than 6mm.
3. The large-caliber multi-stage pilot operated safety valve according to claim 1, wherein: the inlet side of the main valve body is communicated with the upper part of the main valve clack, the outlet side of the valve body is communicated with the lower part of the sealing surface of the main valve clack, and the circumference of the outer diameter of the main valve clack is not provided with a sealing ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910206971.4A CN110030412B (en) | 2019-03-08 | 2019-03-08 | Large-caliber multi-stage pilot operated safety valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910206971.4A CN110030412B (en) | 2019-03-08 | 2019-03-08 | Large-caliber multi-stage pilot operated safety valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110030412A CN110030412A (en) | 2019-07-19 |
| CN110030412B true CN110030412B (en) | 2024-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910206971.4A Active CN110030412B (en) | 2019-03-08 | 2019-03-08 | Large-caliber multi-stage pilot operated safety valve |
Country Status (1)
| Country | Link |
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| CN (1) | CN110030412B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110486479B (en) * | 2019-08-28 | 2020-12-18 | 西安航天动力研究所 | Large-flow three-stage pilot-operated electromagnetic valve |
| CN113028126B (en) * | 2021-04-02 | 2025-01-10 | 吴江市东吴机械有限责任公司 | A pilot safety valve |
| CN113606369B (en) * | 2021-07-21 | 2022-09-06 | 哈电集团哈尔滨电站阀门有限公司 | Pilot-operated safety valve and using method |
| CN113389933B (en) * | 2021-07-29 | 2022-08-09 | 四川长仪油气集输设备股份有限公司 | Multifunctional pilot operated safety valve |
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