CN204493977U - The built-in angie type surge reliever of a kind of dual control - Google Patents
The built-in angie type surge reliever of a kind of dual control Download PDFInfo
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- CN204493977U CN204493977U CN201520135158.XU CN201520135158U CN204493977U CN 204493977 U CN204493977 U CN 204493977U CN 201520135158 U CN201520135158 U CN 201520135158U CN 204493977 U CN204493977 U CN 204493977U
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Abstract
The utility model discloses the built-in angie type surge reliever of a kind of dual control, comprises main valve, solenoid directional control valve, mechanical pilot valves, pressure transmitter, intelligent digital displaying meter (or station control machine) and power supply, filter, two block valves, bafflers; Supervisor's road binders flow path direction is from main valve inlet to Main valve outlet, and main valve inlet end is by first block valve--and high voltage cut-off valve connects high pressure departures pipeline, and Main valve outlet end is by second block valve--and low pressure block valve connects low pressure pipeline to pressure release tank; The pressure release value of intelligent digital displaying meter or station control machine display Outlet pressure and setting; The Outlet pressure of oil transportation station passes through pressure transmitter Transfer Standards signal, to intelligent digital displaying meter or station control machine.Mechanical pilot valves and solenoid directional control valve are connected to main valve body upper cover, and solenoid directional control valve definite value is lower than mechanical pilot valves; Solenoid directional control valve is as primary, and mechanical pilot valves is as subsequent use; Solenoid directional control valve and mechanical pilot valves control simultaneously.Baffler is welded in the middle part of main valve body; Reduce pressure release noise and vibrations.
Description
Technical field
The utility model belongs to pipeline valve technical field, relates to the built-in angie type surge reliever of a kind of dual control, is specially adapted to long distance pipeline.
Background technique
The external angie type surge reliever of known single control comprises main valve, solenoid directional control valve, pressure transmitter, intelligent digital displaying meter (or station control machine) and ups power, filter, four block valves; The pressure release value of intelligent digital displaying meter or station control machine display Outlet pressure and setting; The Outlet pressure of oil transportation station transmits 4-20mA standard signal by pressure transmitter, to intelligent digital displaying meter or station control machine.Supervisor's road binders flow path direction is from main valve inlet to Main valve outlet, and main valve inlet end is by first block valve--and high voltage cut-off valve connects high pressure departures pipeline, and Main valve outlet end is by second block valve--and low pressure block valve connects low pressure pipeline to pressure release tank.Filter is arranged on main valve outside, and filter is connected with main valve by the 3rd, the 4th block valve.
When Outlet pressure meets or exceeds the pressure release value of setting, intelligent digital displaying meter or station control machine output signal are reported to the police and connect the power supply of solenoid directional control valve; Solenoid directional control valve obtains and electricly becomes 2 from 1.While now the A pipeline of solenoid directional control valve and main valve and P pipeline disconnect and T pipeline connect, namely piston upper chamber high-pressure oil passage is closed, and opens piston upper chamber low pressure oil way simultaneously.Piston moves on being pushed under the effect of high pressure entry fluid pressure, and Decompression valves is opened; On high-tension side flow direction low voltage side enters pressure release tank.
When the Outlet pressure that intelligent digital displaying meter or station control machine show is lower than setting value, intelligent digital displaying meter or station control machine stop output alarm signal and cut off power of electromagnetic valve; Solenoid valve dead electricity returns to normal and namely gets back to 1 by 2; Now disconnect with T pipeline while the A pipeline of solenoid directional control valve and main valve and the conducting of P pipeline; Cutoff low side oil circuit while the connection of piston upper chamber high-pressure oil passage.Area due to upper piston area is greater than the port area of bottom, so the power suffered by upper piston area is greater than bottom, piston moves down closes highly pressurised liquid outlet, namely stops pressure release.
There is a lot of problem in single control external angie type surge reliever: problem one is in actual applications, and during high voltage relief, pipeline vibration is large and with ear-piercing howling; Problem two is, inconvenient installation and repairing is safeguarded: pipe fitting is many; Pipe arrangement three elbows are installed, add engineering work load and the complexity of installation; The inspection and maintenance of Decompression valves after Decompression valves installation position sets high and is not easy to; Solenoid valve insulation layer wraps up, and not easily checks and examination is let out, and is difficult to be confirmed whether working properly; Filter rinsed will remove insulation and companion's heat, very inconvenient; Problem three is, high pressure pressure inlet tube, back pressure pipe, low-pressure oil return pipe and solenoid valve base, filter, block valve inconvenience tracing thermal-insulating; Pipe fitting external distributed is difficult to insulation, often causes Decompression valves malfunctioning because temperature is low; Use safety coefficient is low, it is single to control.
Summary of the invention
The utility model discloses the built-in angie type surge reliever of a kind of dual control, with solve prior art mesohigh release time, pipeline vibration is large, with ear-piercing howling; Inconvenience installation and repairing is safeguarded; Inconvenience tracing thermal-insulating, use safety coefficient is low, control the problems such as single.
The utility model comprises main valve, solenoid directional control valve, mechanical pilot valves, pressure transmitter, intelligent digital displaying meter (or station control machine) and power supply, filter, two block valves; Supervisor's road binders flow path direction is from main valve inlet to Main valve outlet, and main valve inlet end is by first block valve--and high voltage cut-off valve connects high pressure departures pipeline, and Main valve outlet end is by second block valve--and low pressure block valve connects low pressure pipeline to pressure release tank; The pressure release value of intelligent digital displaying meter or station control machine display Outlet pressure and setting; The Outlet pressure of oil transportation station transmits 4-20mA standard signal by pressure transmitter, to intelligent digital displaying meter or station control machine.Mechanical pilot valves and solenoid directional control valve are connected to main valve body upper cover, simultaneously control bound; Solenoid directional control valve definite value is lower than mechanical pilot valves; Solenoid directional control valve is as primary, and mechanical pilot valves is as subsequent use; Solenoid directional control valve and mechanical pilot valves control simultaneously.
The Outlet pressure of technical solutions of the utility model oil transportation station shows the pressure release value of Outlet pressure and setting to intelligent digital displaying meter or station control machine by pressure transmitter transmission 4-20mA standard signal.
The utility model solenoid directional control valve definite value is lower than mechanical pilot valves 0.1Mpa--0.3Mpa.When the fluid pressure carried raises, the solenoid directional control valve first normal pressure release of energized action that definite value is slightly low.If certain reason instrument control section fault can not make electromagnetic switch valve events, when conveying fluid pressure continues to reach the definite value of mechanical pilot valves when raising, the normal pressure release of mechanical pilot valves action.
Main valve comprises main valve body, main valve body upper cover, oil cylinder, piston; Upper part of the main valve body has oil cylinder mounting hole between two parties, and oil cylinder is fixedly mounted in upper part of the main valve body oil cylinder mounting hole; Piston is arranged in oil cylinder; Spring fitting is between piston and main valve body upper cover; Install seal ring additional between main valve body and main valve body upper cover, be fastenedly connected between main valve body and main valve body upper cover; Main valve body upper cover has filter installation hole, tracting pressuring hole, back pressure hole, spill port, and filter embeds and is arranged in main valve body upper cover, and filter is arranged on main valve body inside and decreases two block valves; Filter is connected with the tracting pressuring hole that main valve body covers; The back pressure hole that main valve body covers is connected with oil cylinder; The spill port that main valve body covers is connected with main valve body pressure-releasing chamber; High pressure pressure inlet tube is arranged in main valve body, and high pressure pressure inlet tube is communicated with filter and main valve body entrance.Structure is built-in decreases breakthrough, is convenient to very much companion's heat and insulation.The reliability of surge reliever is improved greatly, and Security is enhanced about more than once.Use employing level to install and reduce bend pipe tools, high pressure impulse pipeline, back pressure pipeline, low-pressure oil return pipe road.The situation of oil cylinder 13 radial force inequality that angie type is built-in when changing pressure release.
The utility model also comprises baffler; Baffler is welded in the middle part of main valve body; Baffler has bloop; Reduce the howling that pressure release is ear-piercing, also substantially reduce the pressure release vibrations of Decompression valves.
Working procedure is as follows:
When solenoid directional control valve and mechanical pilot valves are all operated in 1, the back pressure hole that A hole → main valve body that A hole → main valve body on P hole → mechanical pilot valves on A hole → mechanical pilot valves on P hole → solenoid directional control valve on P hole → solenoid directional control valve that a part of tracting pressuring hole → main valve body by pressure inlet tube → filter → main valve body covers of highly pressurised liquid of entrance covers covers covers, is applied to pressure on piston.Another branch road that A pipeline on solenoid directional control valve separates acts on the spool C of mechanical pilot valves; Although piston up and down pressure is equal but compression area top is greater than bottom, piston moves down and is sealed in oil suction chamber entrance upper end under the effect of pressure difference and spring force, make liquid not by.
The output alarm signal when the pressure of highly pressurised liquid reaches the setting value of intelligent digital displaying meter or station control machine, solenoid directional control valve obtains electric working state by 1 to 2 simultaneously, solenoid directional control valve A pipeline and solenoid directional control valve P pipeline disconnect, and connect with solenoid directional control valve T pipeline simultaneously.At this moment piston upper chamber liquid through main valve body upper cover back pressure hole to the A pipeline → mechanical pilot valves of main valve body upper cover A → mechanical pilot valves P pipeline → solenoid directional control valve A pipeline → solenoid directional control valve T pipeline → main valve body upper cover T pipeline → main valve body upper cover spill port → low side outlets by low pressure block valve to pressure release tank.Now the pressure of oil suction chamber entrance substantially exceeds the pressure of piston upper chamber liquid and spring 5 power and piston gravity sum, piston by highly pressurised liquid jack-up, oil suction chamber with go out oil pocket and form path, highly pressurised liquid of releasing, protect high-side devices not to be damaged.
Time below the setting value that pressure drops to intelligent digital displaying meter or station control machine, solenoid directional control valve dead electricity returns to normal 1, namely cuts off being communicated with of piston upper chamber and low pressure oil way, connect high-pressure oil passage, make descent of piston, close oil suction chamber upper end-hole, forbid liquid communication..If when oil suction chamber fluid pressure reaches the setting value of intelligent digital displaying meter or station control machine, solenoid directional control valve still can not get commutation signal, and possible instrument control section is malfunctioning or occur other fault, and solenoid directional control valve always works in 1; If now oil suction chamber fluid pressure continues to raise, the stressed increase of spool C of mechanical pilot valves starts to work, when pressure meets or exceeds the setting value of mechanical pilot valves, the spring of pilot valve is become 2 by compression work state from 1, the A pipeline of mechanical pilot valves and the P pipeline hole of tool pilot valve cut off, and connect with the T pipeline of tool pilot valve simultaneously; Spill port → low side outlets that the back pressure hole that upper piston area liquid covers on main valve body → pipeline A → mechanical pilot valves pilot valve A pipeline → mechanical pilot valves T pipeline → main valve body covers.At this moment the pressure of oil suction chamber entrance substantially exceeds the pressure of piston upper chamber liquid and spring pressure and piston gravity sum, piston is by highly pressurised liquid jack-up, oil suction chamber with go out oil pocket and form path, highly pressurised liquid of releasing. when pressure drops to the setup pressure value of mechanical pilot valves, the stressed reduction of spool C of mechanical pilot valves, spring promotes spool C and returns to normality 1, cut off piston upper chamber low pressure oil way, connect high-pressure oil passage, make descent of piston, close oil suction chamber upper end-hole, forbid liquid communication.
Good effect of the present utility model is: adopt dual control; Namely solenoid directional control valve and mechanical pilot valves control simultaneously, and the reliability of surge reliever is improved greatly, and Security is enhanced about more than once.Structure is built-in; Decrease breakthrough, be convenient to very much companion's heat and insulation.Structure is simple; Employing level is installed and is reduced bend pipe tools, high pressure impulse pipeline, back pressure pipeline, low-pressure oil return pipe road.Design for filtration elements is arranged on main valve body inside and decreases two block valves.Angie type is built-in; The situation of oil cylinder radial force inequality when changing pressure release.Main valve inside has installed muffling hole plate additional, not only reduces ear-piercing howling, also substantially reduces the pressure release vibrations of Decompression valves.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation;
In figure: 1 solenoid directional control valve, 2 filters, 3 tracting pressuring holes, 4 back pressure hole, 5 springs, 6 seal rings, 7 pressure inlet tubes, 8 mechanical pilot valves, 9 main valve body upper covers, 10 spill ports, 11 bolts, 12 seal rings, 13 oil cylinders, 14 pistons, 15 high pressure sealing pad assemblies, 16 bafflers, 17 main valve bodies, ups power, K switch, C spool, YB intelligent digital displaying meter (or station control machine), PT pressure transmitter, FM1 high voltage cut-off valve, FM2 low pressure block valve, IT main valve body entrance, OT main valve body exports.
Embodiment
An embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.
As shown in Figure 1, the utility model comprises main valve, solenoid directional control valve 1, filter 2, mechanical pilot valves 8, baffler 16, pressure transmitter PT, intelligent digital displaying meter (or station control machine) YB and power supply UPS, K switch, high voltage cut-off valve FM1, low pressure block valve FM2 to the utility model embodiment; Main valve comprises spring 5, seal ring 6, pressure inlet tube 7, main valve body upper cover 9, bolt 11, seal ring 12, oil cylinder 13, piston 14, high pressure sealing pad assembly 15, main valve body 17; Supervisor's road binders flow path direction is from main valve inlet IT to Main valve outlet OT, main valve inlet IT holds by first block valve--and high voltage cut-off valve FM1 connects high pressure departures pipeline, and Main valve outlet OT holds by second block valve--and low pressure block valve FM2 connects low pressure pipeline to pressure release tank; Intelligent digital displaying meter or station control machine YB show the pressure release value of Outlet pressure and setting; The Outlet pressure of oil transportation station transmits 4-20mA standard signal by pressure transmitter PT, to intelligent digital displaying meter or station control machine YB.Mechanical pilot valves 8 and solenoid directional control valve 1 are connected to main valve body upper cover 9, simultaneously control bound.Solenoid directional control valve 1 definite value is lower than the definite value 0.1Mpa--0.3Mpa of mechanical pilot valves 8; Solenoid directional control valve 1 is as primary, and mechanical pilot valves 8 is as subsequent use.When the fluid pressure of conveying raises, the solenoid directional control valve 1 first normal pressure release of energized action that definite value is slightly low.If certain reason instrument control section fault can not make solenoid directional control valve 1 action, when conveying fluid pressure continues to reach the definite value of mechanical pilot valves 8 when raising, the normal pressure release of mechanical pilot valves 8 action.
Main valve body 17 top has oil cylinder 13 mounting hole between two parties, and oil cylinder 13 is fixedly mounted in oil cylinder 13 mounting hole of main valve body 17 top; Piston is arranged in oil cylinder 13; Spring 5 is arranged between piston and main valve body upper cover; Install seal ring additional between main valve body and main valve body upper cover, be fastenedly connected between main valve body and main valve body upper cover; Main valve body upper cover has filter installation hole, tracting pressuring hole, back pressure hole, spill port, and filter embeds and is arranged in main valve body upper cover, and filter is arranged on main valve body inside and decreases two block valves; Filter is connected with the tracting pressuring hole that main valve body covers; The back pressure hole that main valve body covers is connected with oil cylinder 13; The spill port that main valve body covers is connected with main valve body pressure-releasing chamber; High pressure pressure inlet tube is arranged in main valve body, and high pressure pressure inlet tube is communicated with filter and main valve body entrance.Structure is built-in decreases breakthrough, is convenient to very much companion's heat and insulation.The reliability of surge reliever is improved greatly, and Security is enhanced about more than once.Use employing level to install and reduce bend pipe tools, high pressure impulse pipeline, back pressure pipeline, low-pressure oil return pipe road.The situation of oil cylinder 13 radial force inequality that angie type is built-in when changing pressure release.
Baffler 16 is welded in the middle part of main valve body; Baffler 16 has bloop; Reduce the howling that pressure release is ear-piercing, also greatly reduce the pressure release vibrations of Decompression valves.
Working procedure is as follows:
When solenoid directional control valve 1 and mechanical pilot valves are all operated in 1, the back pressure hole 4 that A hole → main valve body that A hole → main valve body on P hole → mechanical pilot valves on A hole → mechanical pilot valves on P hole → solenoid directional control valve on P hole → solenoid directional control valve that a part of tracting pressuring hole 3 → main valve body by pressure inlet tube 7 → filter 2 → main valve body covers of highly pressurised liquid of entrance covers covers covers, is applied to pressure on piston 14.Another branch road that A pipeline on solenoid directional control valve separates acts on the spool C of mechanical pilot valves 8.
Although piston about 14 pressure is equal but compression area top is greater than bottom, so piston 14 moves down under the effect of pressure difference and spring 5 power be sealed in oil suction chamber entrance upper end, make liquid not by.The output alarm signal when the pressure of highly pressurised liquid reaches the setting value of intelligent digital displaying meter or station control machine, simultaneously solenoid directional control valve 1 electric working state by 1 to 2.
Solenoid directional control valve A pipeline and solenoid directional control valve P pipeline disconnect, and connect with solenoid directional control valve T pipeline simultaneously.At this moment P pipeline → solenoid directional control valve A pipeline → solenoid directional control valve T pipeline → main valve body upper cover T pipeline → main valve body upper cover spill port 10 → low side outlets that piston 14 epicoele liquid arrives the A pipeline → mechanical pilot valves of main valve body upper cover A → mechanical pilot valves 8 through main valve body upper cover back pressure hole 4 passes through low pressure block valve to pressure release tank.Now the pressure of oil suction chamber entrance substantially exceeds the pressure of piston 14 epicoele liquid and spring 5 power and piston gravity sum, piston 14 by highly pressurised liquid jack-up, oil suction chamber with go out oil pocket and form path, highly pressurised liquid of releasing, protect high-side devices not to be damaged.
Time below the setting value that pressure drops to intelligent digital displaying meter or station control machine, solenoid directional control valve dead electricity returns to normal 1, namely cuts off being communicated with of piston upper chamber and low pressure oil way, connect high-pressure oil passage, make descent of piston, close oil suction chamber upper end-hole, forbid liquid communication..If when oil suction chamber fluid pressure reaches the setting value of intelligent digital displaying meter or station control machine, solenoid directional control valve still can not get commutation signal, and possible instrument control section is malfunctioning or occur other fault, and solenoid directional control valve 1 always works in 1.If at this moment oil suction chamber fluid pressure continues to raise, the stressed increase of spool C of mechanical pilot valves starts to work, when pressure meets or exceeds the setting value of mechanical pilot valves, the spring of pilot valve is become 2 by compression work state from 1, the A pipeline of mechanical pilot valves and the P pipeline hole of mechanical pilot valves cut off, and connect with the T pipeline of mechanical pilot valves simultaneously.Spill port 10 → low side outlets that the back pressure hole that piston 14 upper liquid covers on main valve body → pipeline A → mechanical pilot valves pilot valve A pipeline → mechanical pilot valves T pipeline → main valve body covers.At this moment the pressure of oil suction chamber entrance substantially exceeds the pressure of piston 14 epicoele liquid and spring 5 pressure and piston gravity sum, piston 14 is by highly pressurised liquid jack-up, oil suction chamber with go out oil pocket and form path, to release highly pressurised liquid. time below the setup pressure value that pressure drops to mechanical pilot valves 8, the stressed reduction of spool C of mechanical pilot valves 8, spring promotes spool C and returns to normality 1, cut off piston 14 epicoele low pressure oil way, connect high-pressure oil passage, make descent of piston, close oil suction chamber upper end-hole, forbid liquid communication.
Claims (5)
1. the built-in angie type surge reliever of dual control; It is characterized in that: comprise main valve, solenoid directional control valve, mechanical pilot valves, pressure transmitter, intelligent digital displaying meter or station control machine and power supply, filter, two block valves; Supervisor's road binders flow path direction is from main valve inlet to Main valve outlet, and main valve inlet end is by first block valve--and high voltage cut-off valve connects high pressure departures pipeline, and Main valve outlet end is by second block valve--and low pressure block valve connects low pressure pipeline to pressure release tank; The pressure release value of intelligent digital displaying meter or station control machine display Outlet pressure and setting; The Outlet pressure of oil transportation station passes through pressure transmitter Transfer Standards signal, to intelligent digital displaying meter or station control machine; Mechanical pilot valves and solenoid directional control valve are connected to main valve body upper cover, simultaneously control bound; Solenoid directional control valve definite value is lower than mechanical pilot valves; Solenoid directional control valve and mechanical pilot valves control simultaneously.
2. the built-in angie type surge reliever of dual control according to claim 1; It is characterized in that: the Outlet pressure of oil transportation station transmits 4-20mA standard signal by pressure transmitter.
3. the built-in angie type surge reliever of dual control according to claim 1; It is characterized in that: solenoid directional control valve definite value is lower than mechanical pilot valves 0.1Mpa--0.3Mpa.
4. the built-in angie type surge reliever of dual control according to claim 1; It is characterized in that: main valve comprises main valve body, main valve body upper cover, oil cylinder, piston; Upper part of the main valve body has oil cylinder mounting hole between two parties, and oil cylinder is fixedly mounted in upper part of the main valve body oil cylinder mounting hole; Piston is arranged in oil cylinder; Spring fitting is between piston and main valve body upper cover; Install seal ring additional between main valve body and main valve body upper cover, be fastenedly connected between main valve body and main valve body upper cover; Main valve body upper cover has filter installation hole, tracting pressuring hole, back pressure hole, spill port, and filter embeds and is arranged in main valve body upper cover, and filter is arranged on main valve body inside and decreases two block valves; Filter is connected with the tracting pressuring hole that main valve body covers; The back pressure hole that main valve body covers is connected with oil cylinder; The spill port that main valve body covers is connected with main valve body pressure-releasing chamber; High pressure pressure inlet tube is arranged in main valve body, and high pressure pressure inlet tube is communicated with filter and main valve body entrance.
5. the built-in angie type surge reliever of dual control according to claim 1; It is characterized in that: also comprise baffler; Baffler is welded in the middle part of main valve body; Baffler has bloop.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520135158.XU CN204493977U (en) | 2015-03-11 | 2015-03-11 | The built-in angie type surge reliever of a kind of dual control |
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| CN201520135158.XU CN204493977U (en) | 2015-03-11 | 2015-03-11 | The built-in angie type surge reliever of a kind of dual control |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112096909A (en) * | 2020-10-16 | 2020-12-18 | 欧维克集团有限公司 | Intelligent high-pressure large-caliber low-power-consumption quick-cutting fixed ball valve |
| CN112879634A (en) * | 2021-02-09 | 2021-06-01 | 国家石油天然气管网集团有限公司华南分公司 | Blade motor direct-drive and manual double-control electromagnetic pilot type Y-shaped water hammer relief valve |
| CN112879633A (en) * | 2021-02-09 | 2021-06-01 | 国家石油天然气管网集团有限公司华南分公司 | Mechanical pilot type safe Y-shaped water attack relief valve directly driven by vane motor |
| CN112943991A (en) * | 2021-02-09 | 2021-06-11 | 国家石油天然气管网集团有限公司华南分公司 | Multi-redundancy electromagnetic pilot type safety water hammer relief valve directly driven by vane motor |
| CN112984201A (en) * | 2021-02-09 | 2021-06-18 | 国家石油天然气管网集团有限公司华南分公司 | Double-control axial flow mechanical pilot type water machine pressure release valve directly driven by vane type hydraulic motor |
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2015
- 2015-03-11 CN CN201520135158.XU patent/CN204493977U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112096909A (en) * | 2020-10-16 | 2020-12-18 | 欧维克集团有限公司 | Intelligent high-pressure large-caliber low-power-consumption quick-cutting fixed ball valve |
| CN112879634A (en) * | 2021-02-09 | 2021-06-01 | 国家石油天然气管网集团有限公司华南分公司 | Blade motor direct-drive and manual double-control electromagnetic pilot type Y-shaped water hammer relief valve |
| CN112879633A (en) * | 2021-02-09 | 2021-06-01 | 国家石油天然气管网集团有限公司华南分公司 | Mechanical pilot type safe Y-shaped water attack relief valve directly driven by vane motor |
| CN112943991A (en) * | 2021-02-09 | 2021-06-11 | 国家石油天然气管网集团有限公司华南分公司 | Multi-redundancy electromagnetic pilot type safety water hammer relief valve directly driven by vane motor |
| CN112984201A (en) * | 2021-02-09 | 2021-06-18 | 国家石油天然气管网集团有限公司华南分公司 | Double-control axial flow mechanical pilot type water machine pressure release valve directly driven by vane type hydraulic motor |
| CN112879633B (en) * | 2021-02-09 | 2023-01-17 | 国家石油天然气管网集团有限公司华南分公司 | Mechanical pilot type safe Y-shaped water attack relief valve directly driven by vane motor |
| CN112943991B (en) * | 2021-02-09 | 2023-01-17 | 国家石油天然气管网集团有限公司华南分公司 | Multi-redundancy electromagnetic pilot type safety water hammer relief valve directly driven by vane motor |
| CN112984201B (en) * | 2021-02-09 | 2023-01-17 | 国家石油天然气管网集团有限公司华南分公司 | Blade type hydraulic motor direct-driven double-control axial flow mechanical pilot type water hammer relief valve |
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