CN113374907B - Adjustable pneumatic pressure relief device and water hammer inhibition method based on same - Google Patents
Adjustable pneumatic pressure relief device and water hammer inhibition method based on same Download PDFInfo
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- CN113374907B CN113374907B CN202110727809.4A CN202110727809A CN113374907B CN 113374907 B CN113374907 B CN 113374907B CN 202110727809 A CN202110727809 A CN 202110727809A CN 113374907 B CN113374907 B CN 113374907B
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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
- F16K17/164—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side and remaining closed after return of the normal pressure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
In order to solve the problems of low response speed and insignificant precipitation effect of the existing pressure relief mode, the invention provides an adjustable pneumatic pressure relief device and a water hammer inhibition method based on the same. The adjustable pneumatic pressure relief device comprises a shell, a cylinder top cover, an inlet flange shoulder ring, a piston base and a piston; the shell comprises an air cavity shell and a liquid cavity shell which are integrally arranged, and the overflow area of the air cavity shell is larger than that of the liquid cavity shell; the liquid cavity shell is provided with a liquid outlet along the radial direction thereof; the opening of the liquid outlet can be controlled through the inflation and deflation of the air cavity, so that the liquid outlet is ensured to be closed in the normal working process of the system, the normal fluid conveying process is not influenced, the device responds rapidly when the system is closed, the liquid outlet is opened for liquid discharge, and the purpose of reducing the water hammer pressure is achieved.
Description
Technical Field
The invention relates to an adjustable pneumatic pressure relief device and a water hammer inhibition method based on the same.
Background
In a high-flow high-pressure liquid delivery pipeline system, when a shut-off valve is closed, instantaneous flow changes in the pipeline system can generate water hammer pressure waves in the pipeline, and the pressure values of the water hammer pressure waves can exceed tens of times or hundreds of times of rated working pressure, so that pipelines and process equipment on the pipelines bear great pressure, and great safety and technical risks are brought to the system. Therefore, the valve closing water hammer needs to be restrained, and the water hammer is restrained, and meanwhile, the water hammer measures need to be ensured not to influence the fluid conveying process. The pressure relief mode that can adopt at present is generally relief valve ventilation flowing back and bursting diaphragm pressure release etc. if adopt the relief valve or bursting diaphragm that set pressure is fixed to carry out the water hammer pressure release, need improve setting pressure to far above system operating pressure, the improvement of setting pressure leads to response speed slow, the precipitation effect is unobvious.
Disclosure of Invention
The invention aims to provide an adjustable pneumatic pressure relief device, which can control the opening of a liquid outlet through the inflation and deflation of an air cavity, ensure that the liquid outlet is closed in the normal working process of a system, not influence the normal fluid conveying process, and realize quick response when the system is closed, and the liquid outlet is opened for liquid discharge so as to achieve the purpose of reducing the water hammer pressure. The pressure relief device solves the problems of low response speed and insignificant precipitation effect existing in the existing pressure relief mode.
The technical scheme of the invention is to provide an adjustable pneumatic pressure relief device, which is characterized in that: the device comprises a shell, a cylinder top cover, an inlet flange shoulder ring, a piston base and a piston;
the shell comprises an air cavity shell and a liquid cavity shell which are integrally arranged, and the overflow area of the air cavity shell is larger than that of the liquid cavity shell; the connecting part of the air cavity shell and the liquid cavity shell is provided with a vent hole along the radial direction; the liquid cavity shell is provided with a liquid outlet along the radial direction thereof; the cylinder top cover is fixed at one end of the air cavity shell; three interfaces communicated with the air cavity shell are arranged on the top cover of the air cylinder; the inlet flange shoulder ring is fixed at one end of the liquid cavity shell through a flange; the piston base and the inlet flange shoulder ring are fixed in the liquid cavity shell in a matching way; the piston tail is positioned in the air cavity, the outer peripheral surface of the piston tail is sealed with the inner wall of the air cavity shell through a sealing structure, the piston head is positioned in the liquid cavity, the outer peripheral surface of the piston head is sealed with the inner wall of the liquid cavity shell through a sealing structure, and meanwhile, when the piston head is pressed tightly with the piston base, the liquid outlet is blocked;
the inlet flange shoulder ring is used for being connected with a fluid supply pipeline;
the three interfaces on the cylinder top cover, which are communicated with the air cavity shell, are respectively used for being connected with the air charging pipeline, the air discharging pipeline and the pressure sensor. The opening of the liquid outlet can be controlled through the inflation and deflation of the air cavity, so that the liquid outlet is ensured to be closed in the normal working process of the system, the normal fluid conveying process is not influenced, the device responds rapidly when the system is closed, the liquid outlet is opened for liquid discharge, and the purpose of reducing the water hammer pressure is achieved.
Further, in order to achieve a reliable seal, the seal between the piston and the piston base is achieved by means of a sealing line.
Further, the cobalt-based hard alloy is deposited on the sealing line part, and the sealing line part is processed to be the size after the deposition is finished.
Further, an O-shaped sealing ring and an aluminum pad are adopted to seal between the outer wall of the piston base and the inner wall of the liquid cavity shell.
Further, to meet a particular fluid delivery system, the ratio of the air chamber flow area to the liquid chamber flow area is 6.25.
Further, two liquid draining ports are uniformly distributed on the liquid cavity shell.
Further, the number of the vent holes is four, the vent holes are uniformly distributed on the air cavity shell, and when the piston moves, the air in the cavity part between the piston and the shell is uniformly discharged.
Further, the sealing device is an O-shaped sealing ring.
In order to further improve the practicability of the pressure relief device, the shell, the cylinder top cover and the inlet flange shoulder ring are made of S30408 stainless steel; s8101/carboxyl nitroso is selected as the O-shaped sealing ring material of the piston base, so that the compatibility with the propellant is ensured; the O-shaped sealing ring material at the position close to the air cavity of the piston is made of nitrile rubber, and the O-shaped sealing ring material at the position close to the liquid cavity is made of S8101/carboxyl nitroso.
The invention also provides a method for realizing water hammer inhibition by using the adjustable pneumatic pressure relief device, which is characterized by comprising the following steps:
step 1, determining a corresponding relation between air cavity pressure and liquid cavity pressure;
installing an adjustable pneumatic pressure relief device on the fluid delivery system near the system shut-off valve;
determining the opening pressure of a liquid cavity liquid outlet corresponding to different pressures when the air cavity is inflated according to the air cavity overflow area and the liquid cavity overflow area;
step 2, determining the pressure of the air cavity before the stop valve is opened;
selecting a liquid cavity pressure P1, wherein P1 is larger than a set value; taking the air cavity pressure corresponding to P1 as the air cavity pressure before the fluid conveying system is started; the set value needs to ensure that the fluid conveying system is started normally;
step 3, before the stop valve is opened, the air cavity is inflated;
before the stop valve is opened, an inflation valve is opened to inflate the air cavity of the adjustable pneumatic pressure relief device to p1, and the pressure is maintained in the fluid supply process;
step 4, before the stop valve is closed, balancing the pressure of the air cavity;
before the stop valve is closed, an air cavity air release valve is opened, the air cavity pressure is balanced until p2, the liquid cavity pressure corresponding to p2 is smaller than the set value in the step 2, when the stop valve is closed, the liquid cavity water hammer pressure exceeds the liquid cavity pressure corresponding to p2, a liquid outlet is opened, and the liquid cavity pressure is released;
and 5, after the water hammer pressure is released, when the system pressure is restored to be lower than the pressure of the liquid cavity corresponding to p2, the piston of the adjustable pneumatic pressure relief device automatically returns to the seat under the action of p2 air pressure, and the liquid outlet is closed.
The beneficial effects of the invention are as follows:
1. the hydraulic pressure is regulated by the adjustable pneumatic pressure relief device, the hydraulic pressure peak of the system can be reduced from 70MPa to below 40MPa, the hydraulic capacity of the system is reduced by 80%, the damage of the hydraulic pressure to the system and products is avoided, the response of the hydraulic pressure relief system is ensured to be rapid and reliable, the fluid conveying process is not influenced, and the technical risk is avoided.
2. Through debugging and verification, the principle of the adjustable pneumatic pressure relief device is correct, and compared with the hydraulic pressure relief by adopting a safety valve to vent and drain or burst a diaphragm, the hydraulic pressure relief device has the advantages of real-time adjustment of the set pressure, response speed block, obvious pressure relief effect and simple adjustment.
Drawings
FIG. 1 is a schematic diagram of an adjustable pneumatic pressure relief device according to the present invention;
the reference numerals in the drawings are: the device comprises a 1-shell, a 2-cylinder top cover, a 3-piston, a 4-piston base, a 5-inlet flange shoulder ring, a 6-flange, a 7-first O-shaped sealing ring, an 8-second O-shaped sealing ring and a 9-third O-shaped sealing ring.
Detailed Description
The invention is further described below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the pressure-adjustable pressure relief device of the embodiment comprises a shell 1, a cylinder top cover 2, an inlet flange shoulder ring 5, a piston base 4 and a piston 3; the shell 1 comprises an air cavity shell and a liquid cavity shell which are integrally arranged, and the overflow area of the air cavity shell is larger than that of the liquid cavity shell; in this embodiment, the vent diameter of the air cavity is DN100, and the ratio of the flow area of the air cavity housing to the flow area of the liquid cavity housing is 6.25. The connecting part of the air cavity shell and the liquid cavity shell is provided with vent holes along the radial direction of the connecting part, 4 vent holes are uniformly distributed on the air cavity shell, and the vent holes are used for discharging gas in the cavity part between the piston 3 and the shell 1 when the piston 3 moves. The radial liquid outlet is arranged on the liquid cavity shell and is used for discharging liquid when the water hammer pressure is discharged, and two symmetrical DN32 liquid outlets are arranged in the middle section of the liquid cavity shell. The cylinder top cover 2 is fixed at one end of the air cavity shell. The cylinder top cover 2 is provided with three DN10 straight-through joints communicated with the air cavity shell, and the DN10 straight-through joints are used for connecting the air charging pipeline 2, the air discharging pipeline 4 and the pressure sensor, and can be respectively used for charging and discharging the air cavity and measuring the pressure. The inlet flange shoulder ring 5 is fixed at one end of the liquid cavity shell through a flange 6 and bolts. The piston base 4 and the inlet flange shoulder ring 5 are fixed in the liquid cavity shell in a matching way. And an O-shaped sealing ring and an aluminum gasket are adopted between the piston base 4 and the shell 1 to ensure the sealing reliability. The tail part of the piston 3 is positioned in the air cavity, and the outer peripheral surface of the tail part of the piston 3 is sealed with the inner wall of the air cavity shell through a sealing structure; the head of the piston 3 is positioned in the liquid cavity, and the outer peripheral surface of the head of the piston 3 is sealed with the inner wall of the liquid cavity shell through a sealing structure. The piston 3 is provided with two O-shaped ring seals to ensure that gas and liquid cannot leak into the cavity.
The shell 1, the cylinder top cover 2 and the inlet flange shoulder ring 5 of the adjustable pneumatic pressure relief device are all made of S30508 stainless steel; the bolts are made of 30CrMnSi high-strength stainless steel; s8101/carboxyl nitroso is selected as the material of an O-shaped sealing ring (a first O-shaped sealing ring 7) on the piston base 4, so that the compatibility with the propellant is ensured; the material of the O-shaped sealing ring (the third O-shaped sealing ring 9) at the position close to the air cavity of the piston 3 is nitrile rubber, and the material of the O-shaped sealing ring (the second O-shaped sealing ring 8) at the position close to the liquid cavity is S8101/carboxyl nitroso.
Before assembling each part of the adjustable pneumatic pressure relief device, cleaning and degreasing by alcohol, purging by dry nitrogen, and ensuring no visible surplus in the inner cavity; 7804 lubricating grease is coated on the O-shaped sealing ring and the sealing part of the inner wall of the shell 1 in the assembly process, and after the assembly, the check valve moves flexibly without clamping stagnation; after the assembly is completed, the air cavity is subjected to a 10MPa air tightness test, the liquid cavity is subjected to a 40MPa hydraulic pressure strength test, and the air cavity is purged cleanly after the test.
When the device works, an inlet flange shoulder ring 5 of the adjustable pneumatic pressure relief device is connected with a front pipeline of a system stop valve, and the pressure of the air cavity is adjusted in real time through an air charging pipeline 2 and an air discharging pipeline 4. When the air cavity pressure acts on the piston 3 and is larger than the hydraulic pressure of the liquid cavity, the piston 3 is tightly pressed with the piston base 4, and the liquid in the cavity is ensured not to leak out through the liquid outlet through line sealing. The cobalt-based hard alloy is deposited on the sealing line of the piston 3, and the cobalt-based hard alloy is processed to be the size after the deposition is finished, so that the difference of the hardness of the sealing line between the piston 3 and the base is ensured. When the hydraulic pressure of the liquid cavity is higher than the pressure of the air cavity, the piston 3 moves leftwards, the liquid is discharged through a gap between the piston 3 and the piston base 4, and the liquid flows out through two symmetrical DN32 liquid discharge ports.
Test method
Step 1, determining a corresponding relation between air cavity pressure and liquid cavity pressure;
in this embodiment, the ratio of the air cavity overflow area to the liquid cavity overflow area is 6.25, different liquid cavity pressures are determined through an air cavity and liquid cavity pressure test, the air cavity is inflated to different pressures, the corresponding liquid cavity pressures capable of opening the liquid outlet are shown in table 1, and the air cavity pressures correspond to the liquid outlet opening liquid cavity pressures.
Table 1 comparison table of air cavity pressure versus liquid cavity opening for liquid outlet
Step 2, determining the pressure of an air cavity before the system stop valve is opened;
in table 1, when the air cavity is inflated to 5.4MPa, the corresponding liquid cavity pressure capable of opening the liquid outlet is 32MPa, and because the liquid cavity water hammer pressure in the opening process of the system stop valve is not more than 30MPa, the liquid outlet is not opened in the opening process of the system stop valve, and the opening process of the stop valve is not influenced. Therefore, the air cavity pressure was 5.4MPa before the system interrupter valve was determined to be open.
Step 3, before the system stop valve is opened, the air cavity is inflated;
before the system stop valve is opened, the inflation valve 3 is opened to inflate the air cavity of the adjustable pneumatic pressure relief device 1 to 5.4MPa, and the pressure is maintained during the fluid supply process.
Step 4, before the system stop valve is closed, balancing the pressure of the air cavity;
before the system stop valve is closed, an air cavity air release valve is opened to balance the air cavity to 1.5MPa, when the system is shut down and the hydraulic pressure of the liquid cavity exceeds 9.8MPa, a liquid outlet is opened to release the hydraulic pressure, and the released propellant is discharged into a recovery container through a recovery pipeline. After the hydraulic pressure is released, when the hydraulic pressure in the liquid cavity is restored to be below 9.8MPa, the piston 3 of the adjustable pneumatic pressure relief device 1 automatically returns to the seat under the action of 1.5MPa pressure, and the liquid outlet is closed.
Here, in other embodiments, the air chamber may also be equilibrated to any pressure value below 5MPa in table 1. For example, when the air cavity is balanced to 0.5MPa, and when the system is shut down, the liquid cavity water hammer pressure exceeds 4MPa, and then the liquid outlet is opened. After the hydraulic pressure is released, when the hydraulic pressure in the liquid cavity is restored to below 4MPa, the piston 3 of the adjustable pneumatic pressure relief device 1 automatically returns to the seat under the action of the air pressure of 0.5MPa, and the liquid outlet is closed. For another example, when the air cavity is balanced to 5MPa, and when the system is shut down, the liquid cavity water hammer pressure exceeds 29.8MPa, the liquid outlet is opened. After the hydraulic pressure is released, when the hydraulic pressure in the liquid cavity is restored to below 29.8MPa, the piston 3 of the adjustable pneumatic pressure relief device 1 automatically returns to the seat under the action of 5MPa air pressure, and the liquid outlet is closed.
Compared with the method for performing water hammer pressure relief by adopting a relief valve to vent and drain or bursting diaphragms, the method has the advantages that the setting pressure is less than 30MPa, the response speed is high, and the pressure relief effect is obvious.
Through verification, the hydraulic pressure peak of the system can be reduced from 70MPa to below 40MPa, the hydraulic capacity of the system is reduced by 80%, the damage to the system and products caused by closing of the cut-off valve is avoided, the response of the hydraulic pressure relief system is ensured to be rapid and reliable, the liquid conveying process is not influenced, and the technical risk is avoided.
Claims (10)
1. An adjustable pneumatic pressure relief device, its characterized in that: comprises a shell (1), a cylinder top cover (2), an inlet flange shoulder ring (5), a piston base (4) and a piston (3);
the shell (1) comprises an air cavity shell and a liquid cavity shell which are integrally arranged, and the overflow area of the air cavity shell is larger than that of the liquid cavity shell; the connecting part of the air cavity shell and the liquid cavity shell is provided with a vent hole along the radial direction; the liquid cavity shell is provided with a liquid outlet along the radial direction thereof; the cylinder top cover (2) is fixed at one end of the air cavity shell; three interfaces communicated with the air cavity shell are arranged on the air cylinder top cover (2); the inlet flange shoulder ring (5) is fixed at one end of the liquid cavity shell through a flange (6); the piston base (4) and the inlet flange shoulder ring (5) are fixed in the liquid cavity shell in a matching way; the tail part of the piston (3) is positioned in the air cavity, the outer peripheral surface of the tail part of the piston (3) is sealed with the inner wall of the air cavity shell through a sealing structure, the head part of the piston (3) is positioned in the liquid cavity, the outer peripheral surface of the head part of the piston (3) is sealed with the inner wall of the liquid cavity shell through a sealing structure, and meanwhile, when the head part of the piston (3) is tightly pressed with the piston base (4), the liquid outlet is blocked;
the inlet flange shoulder ring (5) is used for being connected with a fluid supply pipeline;
three interfaces on the cylinder top cover (2) communicated with the air cavity shell are respectively used for being connected with an air charging pipeline, an air discharging pipeline and a pressure sensor;
the water hammer inhibition is realized based on the following process:
step 1, determining a corresponding relation between air cavity pressure and liquid cavity pressure;
installing an adjustable pneumatic pressure relief device on the fluid delivery system near the system shut-off valve;
determining the opening pressure of a liquid cavity liquid outlet corresponding to different pressures when the air cavity is inflated according to the air cavity overflow area and the liquid cavity overflow area;
step 2, determining the pressure of the air cavity before the stop valve is opened;
selecting a liquid cavity pressure p1, wherein p1 is larger than a set value; taking the air cavity pressure corresponding to p1 as the air cavity pressure before the fluid conveying system is started; the set value needs to ensure that the fluid conveying system is started normally;
step 3, before the stop valve is opened, the air cavity is inflated;
before the stop valve is opened, an inflation valve is opened to inflate the air cavity of the adjustable pneumatic pressure relief device to p1, and the pressure is maintained in the fluid supply process;
step 4, before the stop valve is closed, balancing the pressure of the air cavity;
before the stop valve is closed, an air cavity air release valve is opened, the air cavity pressure is balanced until p2, the liquid cavity pressure corresponding to p2 is smaller than the set value in the step 2, when the stop valve is closed, the liquid cavity water hammer pressure exceeds the liquid cavity pressure corresponding to p2, a liquid outlet is opened, and the liquid cavity pressure is released;
and 5, after the water hammer pressure is released, when the system pressure is restored to be lower than the pressure of the liquid cavity corresponding to p2, the piston of the adjustable pneumatic pressure relief device automatically returns to the seat under the action of p2 air pressure, and the liquid outlet is closed.
2. The adjustable pneumatic pressure relief device of claim 1, wherein: the piston (3) and the piston base (4) are sealed by a sealing line.
3. The adjustable pneumatic pressure relief device of claim 2, wherein: and (3) surfacing the cobalt-based hard alloy on the sealing line part, and processing the cobalt-based hard alloy to the size after surfacing is finished.
4. The adjustable pneumatic pressure relief device of claim 3 wherein: the outer wall of the piston base (4) and the inner wall of the liquid cavity shell are sealed by an O-shaped sealing ring and an aluminum pad.
5. The adjustable pneumatic pressure relief device of any one of claims 1-4, wherein: the ratio of the air cavity flow area to the liquid cavity flow area was 6.25.
6. The adjustable pneumatic pressure relief device of claim 5, wherein: the number of the liquid outlets is two, and the liquid outlets are uniformly distributed on the liquid cavity shell.
7. The adjustable pneumatic pressure relief device of claim 6, wherein: the number of the vent holes is four, and the vent holes are uniformly distributed on the air cavity shell.
8. The adjustable pneumatic pressure relief device of claim 7, wherein: the sealing device is an O-shaped sealing ring.
9. The adjustable pneumatic pressure relief device of claim 8, wherein: the shell (1), the cylinder top cover (2) and the inlet flange shoulder ring (5) are made of S30408 stainless steel; s8101/carboxyl nitroso is selected as the O-shaped sealing ring material of the piston base (4); the O-shaped sealing ring material at the position close to the air cavity of the piston (3) is made of nitrile rubber, and the O-shaped sealing ring material at the position close to the liquid cavity is made of S8101/carboxyl nitroso.
10. A method of achieving water hammer suppression using the adjustable pneumatic pressure relief device of any one of claims 1-9, comprising the steps of:
step 1, determining a corresponding relation between air cavity pressure and liquid cavity pressure;
installing an adjustable pneumatic pressure relief device on the fluid delivery system near the system shut-off valve;
determining the opening pressure of a liquid cavity liquid outlet corresponding to different pressures when the air cavity is inflated according to the air cavity overflow area and the liquid cavity overflow area;
step 2, determining the pressure of the air cavity before the stop valve is opened;
selecting a liquid cavity pressure p1, wherein p1 is larger than a set value; taking the air cavity pressure corresponding to p1 as the air cavity pressure before the fluid conveying system is started; the set value needs to ensure that the fluid conveying system is started normally;
step 3, before the stop valve is opened, the air cavity is inflated;
before the stop valve is opened, an inflation valve is opened to inflate the air cavity of the adjustable pneumatic pressure relief device to p1, and the pressure is maintained in the fluid supply process;
step 4, before the stop valve is closed, balancing the pressure of the air cavity;
before the stop valve is closed, an air cavity air release valve is opened, the air cavity pressure is balanced until p2, the liquid cavity pressure corresponding to p2 is smaller than the set value in the step 2, when the stop valve is closed, the liquid cavity water hammer pressure exceeds the liquid cavity pressure corresponding to p2, a liquid outlet is opened, and the liquid cavity pressure is released;
and 5, after the water hammer pressure is released, when the system pressure is restored to be lower than the pressure of the liquid cavity corresponding to p2, the piston of the adjustable pneumatic pressure relief device automatically returns to the seat under the action of p2 air pressure, and the liquid outlet is closed.
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| CN114151643B (en) * | 2021-12-27 | 2024-04-09 | 青海盐湖海纳化工有限公司 | Liquid hammer eliminator and liquid hammer eliminating method for liquefied gas conveying |
| CN117702250A (en) * | 2023-11-16 | 2024-03-15 | 连城凯克斯科技有限公司 | Pressure release adjusting equipment for single crystal furnace |
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| CN202392208U (en) * | 2011-12-28 | 2012-08-22 | 西安航天动力研究所 | Pilot-operated type water attack relief valve system |
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| FR2570463B3 (en) * | 1984-09-19 | 1986-09-19 | Hugues Georges | SAFETY DEVICE FOR ANTI-RAMP PROTECTION SUITABLE FOR PIPES FULL OF PRESSURE LIQUID |
| JP4557283B2 (en) * | 2004-07-13 | 2010-10-06 | 株式会社シビテックリサーチ | Fluid pressure relief valve |
| CN201288882Y (en) * | 2008-11-07 | 2009-08-12 | 湖南湘天源阀门制造有限公司 | Hydraulic controlled piston type water-attack discharging valve |
| CN102773388B (en) * | 2012-07-12 | 2016-03-23 | 西安天宇重工有限公司 | A kind of pressurize pilot relief valve |
| CN210687221U (en) * | 2019-09-16 | 2020-06-05 | 中国石油化工股份有限公司 | Nitrogen type water hammer relief valve with sleeve structure |
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| CN202392208U (en) * | 2011-12-28 | 2012-08-22 | 西安航天动力研究所 | Pilot-operated type water attack relief valve system |
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