CN220396708U

CN220396708U - Gas pressure reducing valve

Info

Publication number: CN220396708U
Application number: CN202321784649.8U
Authority: CN
Inventors: 陈国权; 郭伟钊; 邓显敏; 游锦堂; 麦广智
Original assignee: Changqing Thermal Energy Technology Zhongshan Co ltd
Current assignee: Changqing Thermal Energy Technology Zhongshan Co ltd
Priority date: 2023-07-07
Filing date: 2023-07-07
Publication date: 2024-01-26
Anticipated expiration: 2033-07-07

Abstract

The utility model discloses a gas pressure reducing valve, which comprises: the valve body is provided with an air inlet and an air outlet which are connected in the valve body; the opening and closing mechanism is arranged on the valve body and can close or open the communication state of the air inlet and the air outlet; the pressure reducing mechanism is arranged between the opening and closing mechanism and the air outlet, and can prevent the fuel gas with the pressure higher than a preset value from flowing through the pressure reducing mechanism; the pressure stabilizing mechanism is arranged between the pressure reducing mechanism and the air outlet, and can reduce the air pressure of the fuel gas. The pressure of the fuel gas is reduced through the pressure reducing mechanism, so that the fuel gas can be effectively prevented from being output from the air outlet in the state of overlarge pressure. Therefore, the condition that the atmospheric pressure directly and forcedly rushes through the pressure stabilizing mechanism when the gas exists can be directly and effectively avoided, the problems of gas leakage, deflagration and the like are avoided, and the corresponding potential safety hazards are effectively reduced.

Description

Gas pressure reducing valve

Technical Field

The utility model relates to the field of valves, in particular to a gas pressure reducing valve.

Background

Pressure relief valves are commonly used in gas plants to regulate the pressure of a gas at an excessive pressure, so that the pressure of the gas tends to a nominal value. The prior pressure reducing valve generally reduces or seals the area of a gas passage by driving a sealing component through reverse elasticity of a spring and other components when bearing excessive gas pressure, thereby achieving the pressure reducing effect. However, the pressure reducing valve is usually required to reduce the pressure of the gas after the gas pressure is too high, and the high-pressure gas before the pressure reduction may be directly emitted out of the pressure reducing valve at a high flow rate, which is likely to cause safety accidents.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the fuel gas pressure reducing valve which can prevent high-pressure fuel gas from being ejected.

According to an embodiment of the first aspect of the present utility model, a gas pressure reducing valve includes: the valve body is provided with an air inlet and an air outlet, and the air inlet and the air outlet are communicated in the valve body; the opening and closing mechanism is arranged on the valve body and can close or open the communication state of the air inlet and the air outlet; the pressure reducing mechanism is arranged between the opening and closing mechanism and the air outlet, and can prevent fuel gas with the pressure higher than a preset value from flowing through the pressure reducing mechanism; the pressure stabilizing mechanism is arranged between the pressure reducing mechanism and the air outlet, and the pressure stabilizing mechanism can reduce the air pressure of the fuel gas.

The gas pressure reducing valve provided by the embodiment of the utility model has at least the following beneficial effects: after the opening and closing mechanism opens the gas passage, the gas can pass through the decompression mechanism and the pressure stabilizing mechanism from the gas inlet and flow to the gas outlet. The pressure reducing mechanism can reduce the pressure of the fuel gas, and if the pressure of the fuel gas is too high, the pressure reducing mechanism can seal a passage of the fuel gas and the fuel gas cannot flow out from the air outlet continuously. The pressure stabilizing mechanism can further regulate the gas pressure of the gas and ensure that the gas pressure of the gas output from the gas outlet tends to be stable.

The pressure of the fuel gas is reduced through the pressure reducing mechanism, so that the fuel gas can be effectively prevented from being output from the air outlet in the state of overlarge pressure. Therefore, the condition that the atmospheric pressure directly and forcedly rushes through the pressure stabilizing mechanism when the gas exists can be directly and effectively avoided, the problems of gas leakage, deflagration and the like are avoided, and the corresponding potential safety hazards are effectively reduced.

According to some embodiments of the utility model, the opening and closing mechanism comprises a solenoid valve, a first passage is arranged between the air inlet and the pressure reducing mechanism, and the solenoid valve is movably connected with a sealing piece and can drive the sealing piece to move close to and close the first passage or far away from the first passage.

According to some embodiments of the utility model, a pushing spring is arranged between the sealing piece and the electromagnetic valve, and the pushing spring can elastically push the sealing piece to move towards the first passage; the valve body is internally provided with a pushing piece, and the pushing piece and the pushing spring are respectively positioned at two sides of the sealing piece and can both push the sealing piece to move.

According to some embodiments of the utility model, a first passageway, a second passageway and a pressure reducing cavity are arranged in the valve body, the pressure reducing cavity is communicated to the pressure stabilizing mechanism, the pressure reducing mechanism comprises a pressure reducing part and an abutting part, the pressure reducing part is arranged in the pressure reducing cavity, the pressure reducing part can elastically move and is far away from the abutting part, and the pressure reducing part can move close to the abutting part under the pushing of fuel gas and enables the second passageway to be isolated from the first passageway relatively.

According to some embodiments of the utility model, a first diaphragm capable of deforming according to the air pressure is elastically connected in the pressure reducing cavity, and the first diaphragm is connected with the pressure reducing piece and can drive the pressure reducing piece to move relative to the abutting piece.

According to some embodiments of the utility model, a first spring and a second spring are arranged in the valve body, the first spring can push the abutting piece and the pressure reducing piece to move relatively close, the second spring can push the abutting piece and the pressure reducing piece to move relatively far away, and the elastic force of the second spring is larger than that of the first spring.

According to some embodiments of the utility model, the pressure stabilizing mechanism includes a third passageway through which the pressure reducing mechanism communicates with the air outlet; a second diaphragm is arranged in the valve body, and gas in the third passageway can push the second diaphragm; the third passageway is provided with a guide port and is communicated with the pressure reducing mechanism, and the second diaphragm is connected with a plugging piece and can drive the plugging piece to move close to or far away from the guide port.

According to some embodiments of the utility model, a lever is rotatably arranged in the third passageway, the second diaphragm is provided with a connecting piece, the connecting piece and the blocking piece are respectively hinged to two ends of the lever, and the rotation center of the lever is located in the middle of the lever.

According to some embodiments of the utility model, the valve body comprises a housing covering the second diaphragm and forming a second pneumatic chamber, the second pneumatic chamber and the third passageway being located on two sides of the second diaphragm, respectively; the shell is provided with a vent hole, and the second air pressure cavity is communicated to the outside of the shell through the vent hole.

According to some embodiments of the utility model, the valve body is formed by detachably connecting three valve bodies, and the opening and closing mechanism, the pressure reducing mechanism and the pressure stabilizing mechanism are arranged on the valve bodies in a one-to-one correspondence.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic diagram of a gas pressure relief valve according to an embodiment of the present utility model;

FIG. 2 is a schematic illustration of a cross-section of the gas pressure relief valve shown in FIG. 1;

FIG. 3 is a schematic view of an opening and closing mechanism of the gas pressure reducing valve shown in FIG. 1;

FIG. 4 is a schematic view of a pressure relief mechanism of the gas pressure relief valve shown in FIG. 1;

fig. 5 is a schematic view of a pressure stabilizing mechanism of the gas pressure reducing valve shown in fig. 1.

Reference numerals: a valve body 100; an air inlet 110; an opening and closing mechanism 200; a solenoid valve 210; a pressure reducing mechanism 230; a first spring 231; a first pneumatic chamber 232; a first membrane 233; an abutment 234; a pressure relief cavity 235; a pressure reducing member 237; a second spring 238; a closure 250; a pushing spring 260; pushing member 270; a voltage stabilizing mechanism 300; a closure 310; a lever 320; a connector 330; a second diaphragm 350; a housing 360; a vent 365; a second pneumatic chamber 370; an air outlet 390; a first aisle 410; a second aisle 420; a third aisle 430; an injection port 440;

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

Referring to fig. 1, a gas pressure reducing valve includes: the valve body 100, the opening and closing mechanism 200, the pressure reducing mechanism 230 and the pressure stabilizing mechanism 300 are arranged, the valve body 100 is provided with an air inlet 110 and an air outlet 390, and the air inlet 110 and the air outlet 390 are communicated in the valve body 100; the opening and closing mechanism 200 is arranged on the valve body 100, and the opening and closing mechanism 200 can close or open the communication state of the air inlet 110 and the air outlet 390; the pressure reducing mechanism 230 is disposed between the opening and closing mechanism 200 and the air outlet 390, and the pressure reducing mechanism 230 can prevent the gas with the pressure higher than the predetermined value from flowing through the pressure reducing mechanism 230; the pressure stabilizing mechanism 300 is disposed between the pressure reducing mechanism 230 and the air outlet 390, and the pressure stabilizing mechanism 300 can reduce the air pressure of the fuel gas. After the opening and closing mechanism 200 opens the gas passage, the gas can pass through the pressure reducing mechanism 230 and the pressure stabilizing mechanism 300 from the gas inlet 110, and flow to the gas outlet 390. The pressure reducing mechanism 230 can reduce the pressure of the gas, and if the pressure of the gas is too high, the pressure reducing mechanism 230 will close the passage of the gas and prevent the gas from flowing out of the gas outlet 390. The pressure stabilizing mechanism 300 further adjusts the gas pressure and ensures that the gas pressure of the gas output at the gas outlet 390 tends to be stable. The pressure of the gas is reduced by the pressure reducing mechanism 230, so that the gas can be effectively prevented from being output from the gas outlet 390 in a state where the gas pressure is too high. Therefore, the condition that the atmospheric pressure directly and forcedly rushes through the pressure stabilizing mechanism 300 when the gas exists can be directly and effectively avoided, the problems of gas leakage, deflagration and the like are avoided, and the corresponding potential safety hazards are effectively reduced.

In some embodiments, referring to fig. 3, the opening and closing mechanism 200 includes a solenoid valve 210, a first passageway 410 is disposed between the air inlet 110 and the pressure reducing mechanism 230, and the solenoid valve 210 is movably connected with a closing member 250 and can drive the closing member 250 to move close to and close the first passageway 410 or away from the first passageway 410. When the pressure reducing valve needs to be closed, the electromagnetic valve 210 can be started to drive the sealing member 250 to move to the first passage 410, so as to seal the first passage 410, and further achieve the effect of blocking fuel gas. When the pressure stabilizing valve needs to be opened, the electromagnetic valve 210 or other components can drive the sealing piece 250 to move away from the first channel 410, so that the opening and closing effect of the pressure stabilizing valve can be realized quickly and conveniently.

Specifically, the closure 250 is a sphere, which can be repelled by the magnetic force upon actuation of the solenoid valve 210 and cause the closure 250 to clog at the first passage 410.

In certain embodiments, referring to fig. 3, a push spring 260 is disposed between the closure 250 and the solenoid valve 210, the push spring 260 being capable of resiliently pushing the closure 250 toward the first passage 410; the valve body 100 is provided with a pushing member 270, and the pushing member 270 and the pushing spring 260 are respectively positioned at two sides of the sealing member 250 and can both push the sealing member 250 to move. The pushing spring 260 can still continuously push the sealing member 250 after the electromagnetic valve 210 loses the force applied to the sealing member 250, so that the sealing member 250 can still stably block the first passageway 410 even if the electromagnetic valve 210 fails or a circuit is short-circuited, and the effect of blocking the flow of fuel gas can be stably achieved.

In certain embodiments, referring to fig. 4, a first passageway 410, a second passageway 420, and a pressure reducing chamber 235 are disposed in the valve body 100, the pressure reducing chamber 235 is connected to the pressure stabilizing mechanism 300, the pressure reducing mechanism 230 includes a pressure reducing member 237 and an abutment member 234 disposed in the pressure reducing chamber 235, the pressure reducing member 237 is capable of elastically moving away from the abutment member 234, and the pressure reducing member 237 is capable of moving closer to the abutment member 234 under the pushing of the fuel gas and isolating the second passageway 420 from the first passageway 410. After entering the first passageway 410, the gas will flow through the second passageway 420 and the pressure relief chamber 235 and thereafter to the pressure stabilizing mechanism 300. When the gas pressure is too high, the gas will push the pressure reducing member 237 to move close to and abut against the abutting member 234, so that the first passageway 410 and the second passageway 420 are relatively closed, thereby blocking the flow of the gas under the over-atmospheric pressure and preventing the gas from being ejected at high pressure. After the air pressure of the fuel gas is reduced, the pressure reducing member 237 will move away from the abutting member 234 under the action of the elastic force, so that the second passageway 420 and the first passageway 410 are communicated with each other, and further the fuel gas can be conveyed continuously.

Specifically, the second aisle 420 and the first aisle 410 are located on both sides of the pressure reducing member 237, respectively, the second aisle 420 is disposed in the abutting member 234, and when the pressure reducing member 237 moves toward the abutting member 234 and abuts against the abutting member 234, the second aisle 420 can be closed.

In some embodiments, referring to fig. 4, a first diaphragm 233 capable of deforming according to the air pressure is elastically connected in the pressure reducing chamber 235, and the first diaphragm 233 is connected to the pressure reducing member 237 and is capable of driving the pressure reducing member 237 to move toward the abutment member 234. The first membrane 233 can bear the air pressure of the fuel gas and elastically deform according to the air pressure of the fuel gas, so that the pressure reducing member 237 is driven to move towards the abutting member 234 through the elastic deformation, and further, the effect of sealing between the first passageway 410 and the second passageway 420 when the air pressure of the fuel gas is overlarge is directly and effectively achieved.

Specifically, the first diaphragm 233 is connected with a connecting rod, the abutment 234 is located between the first diaphragm 233 and the pressure reducing member 237, the connecting rod passes through the pressure reducing member 237 and is connected with the abutment 234, and the second passageway 420 is located in the abutment 234. When the air pressure in the pressure reducing chamber 235 is too high, the first membrane 233 is pushed to elastically deform in a direction away from the abutment 234, and the pressure reducing member 237 is driven to move toward the abutment 234.

Further, a first air pressure chamber 232 communicating with the outside is provided in the valve body 100, and a first diaphragm 233 is provided between the first air pressure chamber 232 and the pressure reducing chamber 235.

Still further, the gas pressure is higher than a predetermined value, wherein the predetermined value is a gas pressure value of the gas when the first diaphragm 233 is pushed to elastically deform and the pressure reducing member 237 abuts against the abutting member 234.

In some embodiments, referring to fig. 4, a first spring 231 and a second spring 238 are disposed in the valve body 100, the first spring 231 is capable of pushing the abutment 234 and the pressure reducing member 237 to move closer together, the second spring 238 is capable of pushing the abutment 234 and the pressure reducing member 237 to move farther apart, and the elastic force of the second spring 238 is greater than the elastic force of the first spring 231. Since the elastic force of the second spring 238 is greater than that of the first spring 231, the abutting piece 234 and the pressure reducing piece 237 will be in a relatively distant state in a normal state, and thus the first passage 410 and the second passage 420 are in a state of being communicated with each other, and the fuel gas can smoothly flow. When the air pressure of the fuel gas is too high, the fuel gas will push the first membrane 233 to deform against the elastic force of the first spring 231, so that the pressure reducing member 237 moves close to and closes the second passageway 420, and the effect of blocking the fuel gas is effectively achieved. The first spring 231 and the second spring 238 apply force to the abutting piece 234 together, so that the pressure reducing piece 237 is in an elastic balance state, and after the gas pressure of the gas is adjusted, the abutting piece 234 automatically returns to a preset state and is not driven to deviate by the changed gas pressure, and further, the sufficient stability and smoothness of the gas flowing process are ensured.

In certain embodiments, referring to fig. 5, the pressure stabilizing mechanism 300 includes a third passageway 430, and the pressure relief mechanism 230 communicates with the air outlet 390 via the third passageway 430; a second diaphragm 350 is arranged in the valve body 100, and gas in the third passageway 430 can push the second diaphragm 350; a port 440 is provided between and in communication with the third passageway 430 and the pressure relief mechanism 230, and the second diaphragm 350 is coupled to the occluding component 310 and is capable of moving the occluding component 310 toward or away from the port 440. When the gas pressure in the third passageway 430 is too high, the gas will push the second membrane 350, and the second membrane 350 drives the blocking member 310 to move close to the injection port 440, and the gas injected from the injection port 440 is blocked. Therefore, when the gas pressure is too high, the gas flow in the third passageway 430 will be automatically reduced by the second diaphragm 350 and the blocking member 310, so as to directly and effectively achieve the effect of automatically adjusting the gas pressure.

In some embodiments, referring to fig. 5, a lever 320 is rotatably disposed in the third passage 430, the second diaphragm 350 is provided with a connection member 330, the connection member 330 and the blocking member 310 are respectively hinged to both ends of the lever 320, and a rotation center of the lever 320 is located at the middle thereof. After the second diaphragm 350 moves, the lever 320 is driven to rotate by the connecting piece 330, so that the lever 320 can drive the plugging piece 310 to move close to the injection port 440, and further the purpose of directly and effectively blocking the gas injected from the injection port 440 is achieved. The rotation of the lever 320 has the advantage of stability and reliability and a long transmission distance, so that the air pressure change of the fuel gas at the third passageway 430 can be effectively transmitted to the injection port 440.

In some embodiments, referring to fig. 5, the valve body 100 includes a housing 360, the housing 360 covers the second diaphragm 350 and forms a second pneumatic chamber 370, and the second pneumatic chamber 370 and the third passageway 430 are located at both sides of the second diaphragm 350, respectively; the housing 360 is provided with a vent hole 365, and the second air pressure chamber 370 is communicated to the outside of the housing 360 through the vent hole 365. The second air pressure chamber 370 communicates with the outside through the air vent 365, and thus the air pressure in the second air pressure chamber 370 will be maintained to be uniform with the atmospheric pressure. When the gas pushes the second diaphragm 350 from the third passageway 430, the second diaphragm 350 deforms toward the inside of the second air pressure chamber 370, and the volume of the second air pressure chamber 370 is reduced. Since the air in the second air pressure chamber 370 is exhausted from the air vent 365, the second air pressure chamber 370 continuously maintains the atmospheric pressure, thereby avoiding the problem of air pressure enhancement due to volume reduction, ensuring that the second diaphragm 350 does not receive additional pressure and allowing the second diaphragm 350 to stably receive the air pressure of the fuel gas from the third passageway 430.

In some embodiments, referring to fig. 2, the valve body 100 is formed by detachably connecting three valve bodies, and the opening and closing mechanism 200, the pressure reducing mechanism 230, and the pressure stabilizing mechanism 300 are disposed on the valve bodies in one-to-one correspondence. When the three valve bodies are detached relatively, the opening and closing mechanism 200, the pressure reducing mechanism 230 and the pressure stabilizing mechanism 300 can be separated relatively quickly and conveniently, so that the three valve bodies are maintained or replaced conveniently, and convenience can be brought to maintenance and repair operation of the pressure reducing valve effectively.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.

Claims

1. A gas pressure reducing valve, comprising:

the valve body (100), the valve body (100) is provided with an air inlet (110) and an air outlet (390), and the air inlet (110) and the air outlet (390) are communicated with each other in the valve body (100);

the opening and closing mechanism (200) is arranged on the valve body (100), and the opening and closing mechanism (200) can close or open the communication state of the air inlet (110) and the air outlet (390);

a pressure reducing mechanism (230) arranged between the opening and closing mechanism (200) and the air outlet (390), wherein the pressure reducing mechanism (230) can prevent the fuel gas with the pressure higher than a preset value from flowing through the pressure reducing mechanism (230);

the pressure stabilizing mechanism (300) is arranged between the pressure reducing mechanism (230) and the air outlet (390), and the pressure stabilizing mechanism (300) can reduce the air pressure of the fuel gas.

2. The gas pressure relief valve as defined in claim 1, wherein:

the opening and closing mechanism (200) comprises an electromagnetic valve (210), a first passageway (410) is arranged between the air inlet (110) and the pressure reducing mechanism (230), and the electromagnetic valve (210) is movably connected with a sealing piece (250) and can drive the sealing piece (250) to move to be close to and seal the first passageway (410) or to be far away from the first passageway (410).

3. The gas pressure relief valve as defined in claim 2, wherein:

a pushing spring (260) is arranged between the sealing piece (250) and the electromagnetic valve (210), and the pushing spring (260) can elastically push the sealing piece (250) to move towards the first passageway (410); the valve body (100) is internally provided with a pushing piece (270), and the pushing piece (270) and the pushing spring (260) are respectively positioned at two sides of the sealing piece (250) and can both push the sealing piece (250) to move.

4. The gas pressure relief valve as defined in claim 1, wherein:

be provided with first passageway (410), second passageway (420) and decompression chamber (235) in valve body (100), decompression chamber (235) communicate to steady voltage mechanism (300) department, decompression mechanism (230) including set up in decompression piece (237) and butt piece (234) in decompression chamber (235), decompression piece (237) can elastic movement and keep away from butt piece (234), decompression piece (237) can be close to under the bulldoze of gas butt piece (234) and make second passageway (420) with first passageway (410) are isolated relatively.

5. The gas pressure relief valve as defined in claim 4, wherein:

the pressure reducing cavity (235) is internally and elastically connected with a first diaphragm (233) capable of deforming according to the air pressure, and the first diaphragm (233) is connected with the pressure reducing piece (237) and can drive the pressure reducing piece (237) to move relative to the abutting piece (234).

6. The gas pressure relief valve as defined in claim 4, wherein:

be provided with first spring (231) and second spring (238) in valve body (100), first spring (231) can push away abutting part (234) with the relative motion of decompression piece (237) is close to, second spring (238) can push away abutting part (234) with the relative motion of decompression piece (237) is kept away from, the elasticity of second spring (238) is greater than the elasticity of first spring (231).

7. The gas pressure relief valve as defined in claim 1, wherein:

the pressure stabilizing mechanism (300) comprises a third passageway (430), and the pressure reducing mechanism (230) is communicated with the air outlet (390) through the third passageway (430); a second diaphragm (350) is arranged in the valve body (100), and gas in the third passageway (430) can push the second diaphragm (350); an injection port (440) is arranged between the third passageway (430) and the pressure reducing mechanism (230) and is communicated with the third passageway, and the second diaphragm (350) is connected with a plugging piece (310) and can drive the plugging piece (310) to move close to or far away from the injection port (440).

8. The gas pressure relief valve as defined in claim 7, wherein:

the third passageway (430) is internally rotatably provided with a lever (320), the second membrane (350) is provided with a connecting piece (330), the connecting piece (330) and the plugging piece (310) are respectively hinged to two ends of the lever (320), and the rotation center of the lever (320) is located in the middle of the lever.

9. The gas pressure relief valve as defined in claim 7, wherein:

the valve body (100) comprises a shell (360), the shell (360) covers the second diaphragm (350) and is provided with a second air pressure cavity (370), and the second air pressure cavity (370) and the third passageway (430) are respectively positioned at two sides of the second diaphragm (350); the housing (360) is provided with a vent hole (365), and the second air pressure cavity (370) is communicated to the outside of the housing (360) through the vent hole (365).

10. The gas pressure relief valve as defined in claim 1, wherein:

the valve body (100) is formed by detachably connecting three valve bodies, and the opening and closing mechanism (200), the pressure reducing mechanism (230) and the pressure stabilizing mechanism (300) are arranged on the valve bodies in a one-to-one correspondence manner.