CN213871280U - Gas self-closing valve - Google Patents

Abstract

The application relates to the technical field of pipeline fluid control, in particular to a gas self-closing valve. The gas self-closing valve comprises a valve body and a valve core structure, wherein the valve body is internally provided with a pressure cavity, a valve cavity and a valve port, and the valve core structure is arranged in the pressure cavity and can respond to the pressure difference between the pressure cavity and the valve cavity to move in the pressure cavity so as to open and close the valve port; the gas self-closing valve further comprises a guide structure, the guide structure is fixed in the pressure cavity and is in guide fit with the valve core structure, and when the valve core structure moves, the guide structure can guide the movement of the valve core structure. The application has the advantages that: simple structure, has the guide effect and easily processes.

Description

Gas self-closing valve

Technical Field

The application relates to the technical field of pipeline fluid control, in particular to a gas self-closing valve.

Background

The gas self-closing valve is arranged on a low-pressure gas pipeline, when the gas supply pressure of the pipeline is under-pressure, overpressure or overcurrent, the gas self-closing valve can be automatically closed without electric power or other external power, and the conventional gas self-closing valve opens or closes a valve port through the movement of a valve core so as to block or conduct the circulation of gas in the valve body and realize the function of automatic monitoring.

However, in the process of the valve core moving in the valve body, the problem of unsmooth movement and low precision of the valve core is easily caused due to the absence of the guide element, so that the valve core is shaken when being pushed by gas, and a valve port cannot be opened or closed stably and timely, and partial gas is leaked.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need for a gas self-closing valve with simple structure, guiding function and easy processing.

In order to solve the technical problem, the application provides the following technical scheme:

a gas self-closing valve comprises a valve body and a valve core structure, wherein the valve body is internally provided with a pressure cavity, a valve cavity and a valve port, and the valve core structure is arranged in the pressure cavity and can respond to the pressure difference between the pressure cavity and the valve cavity to move in the pressure cavity so as to open and close the valve port; the gas self-closing valve further comprises a guide structure, the guide structure is fixed in the pressure cavity and is in guide fit with the valve core structure, and when the valve core structure moves, the guide structure can guide the movement of the valve core structure.

In the present application, the valve core structure moves in the pressure chamber to open or close the valve port by responding to a pressure difference between the pressure chamber and the valve chamber; however, the problem of unsmooth movement and low precision of the valve core structure is caused, so that gas shakes when pushing the valve core structure, and the valve port cannot be stably and timely opened or closed, and partial gas is leaked; therefore, the guide structure is fixedly arranged in the pressure cavity, the guide effect is achieved on the movement of the valve core structure, the movement of the valve core structure is smoother, and the accuracy of opening or closing the valve port is improved.

In one embodiment, the guide structure includes a guide rod, one end of the guide rod is fixed to the valve body and extends along the axis of the valve port toward the valve cavity, and the valve core structure is provided with a matching portion, and the matching portion is in guiding matching with the guide rod.

So set up, through the cooperation of guide bar with cooperation portion, the smooth and easy stable motion of direction case structure in the pressure chamber makes the case structure more accurate when opening or closing the valve port to and the leakage of avoiding the gas in time.

In one embodiment, the guide rod is integrally formed with the valve body, and the fitting portion is a guide groove formed in the valve core structure in an inward concave manner, and the guide groove is in guide fit with the guide rod.

So set up, through the cooperation of guide bar and guide way, further the motion that the case structure of leading is more smooth and easy stable in the pressure chamber, more accurate when making the case structure open or close the valve port to and avoid the leakage of gas in time.

In one embodiment, the valve core structure is provided with a guide member, and the engagement portion is located on the guide member.

Due to the arrangement, the valve core structure is convenient to process and install; meanwhile, the guide piece can be matched with the guide rod to play a role in opening and closing the valve port by the guide valve core structure.

In one embodiment, the number of the guide grooves is multiple, and the multiple guide grooves are uniformly distributed in the circumferential direction of the guide piece.

So set up, a plurality of guide way evenly distributed is in the circumference of guide, through the cooperation between a plurality of guide ways and the guide bar to the motion of direction case structure more steadily.

In one embodiment, the guide groove is an arc-shaped groove and is attached to the outer side wall of the guide rod.

So set up, the shape looks adaptation of guide way and guide bar makes the guide effect more smooth and easy stable.

In one embodiment, the gas self-closing valve further comprises a first magnetic member, the first magnetic member is mounted on the guide rod, the valve core structure comprises a valve core unit and a holding portion, one end of the valve core unit is slidably disposed through the first magnetic member, the other end of the valve core unit is used for opening and closing the valve port, and the holding portion is mounted at one end of the valve core unit, which is far away from the valve port, and is in magnetic attraction fit with the first magnetic member to drive the valve core unit to move to close the valve port.

According to the arrangement, the valve core structure moves towards the valve port direction through the suction force between the first magnetic part and the suction part of the valve core structure, so that the valve port is closed to block the circulation of fuel gas.

In one embodiment, the holding part is a magnetic member or made of a ferromagnetic material.

So set up, holding portion itself can be magnetic member or can also be by being made by the material that is easily magnetized to produce the cooperation of magnetic attraction between with first magnetic member.

In one embodiment, the gas self-closing valve further comprises a diaphragm structure and a valve rod structure, wherein the diaphragm structure is hermetically arranged in the valve body and divides the interior of the valve body into the pressure cavity and the valve cavity; the valve rod structure is arranged in the valve cavity, one end of the valve rod structure penetrates through the valve cavity and is arranged on the diaphragm structure, the valve rod structure can form magnetic attraction matching with the sucking part, and the valve rod structure is connected with the diaphragm structure in a riveting mode.

So set up, through the cooperation of inhaling magnetism between valve rod structure and the suction portion, drive case structure towards the direction motion of being close to or keeping away from the valve port to close or open the valve port.

In one embodiment, the valve rod structure comprises a second magnetic part, the second magnetic part is located in the pressure cavity and can be in magnetic attraction fit with the holding part, and the attraction force of the first magnetic part is greater than that of the second magnetic part.

In such arrangement, the second magnetic part is magnetically attracted and matched with the attraction part to drive the valve core structure to move towards a direction close to or far away from the valve port so as to close or open the valve port; meanwhile, when the pressure of the pressure cavity is overlarge, the diaphragm structure is enabled to bulge towards the direction away from the valve port, and the second magnetic part is driven to move, so that the second magnetic part is separated from the first magnetic part; the suction force between the first magnetic part and the holding part is larger than the suction force between the second magnetic part and the holding part, so that the holding part can be adsorbed by the first magnetic part more timely, and the valve core structure moves towards the direction of the valve port to close the valve port and block the circulation of fuel gas.

Compared with the prior art, the gas self-closing valve has the advantages that the valve core structure moves in the pressure cavity to open or close the valve port by responding to the pressure difference between the pressure cavity and the valve cavity; however, the problem of unsmooth movement and low precision of the valve core structure is caused, so that gas shakes when pushing the valve core structure, and the valve port cannot be stably and timely opened or closed, and partial gas is leaked; therefore, the guide structure is fixedly arranged in the pressure cavity, the guide effect is achieved on the movement of the valve core structure, the movement of the valve core structure is smoother, and the accuracy of opening or closing the valve port is improved.

Drawings

Fig. 1 is a schematic cross-sectional view of the gas self-closing valve provided by the application.

Fig. 2 is a schematic structural diagram of a valve core structure.

In the figure, 100, a gas self-closing valve; 10. a valve body; 11. a valve cavity; 12. a pressure chamber; 13. a valve port; 20. a valve core structure; 21. a valve element unit; 211. a seal member; 212. a valve core; 22. a holding section; 23. a guide groove; 24. a fitting portion; 25. a guide member; 30. a guide structure; 31. a guide bar; 40. a first magnetic member; 41. a screw; 50. a membrane structure; 51. a fixing sheet; 52. a pressure diaphragm; 60. a valve stem structure; 61. a valve stem; 62. a second magnetic member; 70. a valve cover; 71. lifting the button; 80. an over-current control; 81. a diversion upper cover; 82. a flow-impeding component; 83. a lower cover is guided; 84. a gas circuit; 85. an elastic member; 90. a knob; 91. a ball valve assembly; 92. an inlet; 93. and (7) an outlet.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, the present application provides a gas self-closing valve 100, where the gas self-closing valve 100 is installed on a low-pressure gas system pipeline, and can automatically close to block gas leakage when the pipeline gas supply pressure is under-pressure or over-pressure, so as to achieve a protective effect.

Referring to fig. 1, fig. 1 is a schematic cross-sectional view of a gas self-closing valve 100 according to an embodiment of the present disclosure, specifically, the gas self-closing valve 100 includes a valve body 10 and a valve core structure 20, the valve body 10 has a pressure chamber 12, a valve chamber 11 and a valve port 13 therein, the valve core structure 20 is disposed in the pressure chamber 12 and can move in the pressure chamber 12 to open and close the valve port 13 in response to a pressure difference between the pressure chamber 12 and the valve chamber 11; when the pressure of the pressure chamber 12 is too low or too high, the valve core structure 20 is moved in the pressure chamber 12 to close the valve port 13, thereby blocking the leakage of the fuel gas.

Further, the gas self-closing valve 100 further comprises a guide structure 30, wherein the guide structure 30 is fixed in the pressure chamber 12 and guides the valve core structure 20 when the valve core structure 20 moves; it can be understood that, because the valve core structure 20 may generate the problems of unsmooth movement and low precision, the gas may shake when pushing the valve core structure 20, and the valve port 13 may not be stably and timely opened or closed, resulting in partial gas leakage; therefore, the guide structure 30 is fixedly arranged in the pressure chamber 12, and plays a role in guiding the movement of the valve core structure 20, so that the movement of the valve core structure 20 is smoother, and the accuracy of opening or closing the valve port 13 is improved.

Specifically, the guide structure 30 includes a guide rod 31, one end of the guide rod 31 is fixed to the valve body 10 and extends toward the valve cavity 11 along the axis of the valve port 13, the valve core structure 20 is provided with a matching portion 24, the matching portion 24 is in guiding fit with the guide rod 31, and through the matching of the guide rod 31 and the matching portion 24, the guide valve core structure 20 moves smoothly and stably in the pressure cavity 12, so that the valve core structure 20 is more accurate when opening or closing the valve port 13, and leakage of gas is avoided.

In the present application, the guide rod 31 is integrally formed with the valve body 10.

Further, as shown in fig. 2, the valve core structure 20 is provided with a guide 25, the matching portion 24 is located on the guide 25, the matching portion 24 is a guide groove 23 concavely formed on the valve core structure 20, and the guide groove 23 is in guiding fit with the guide rod 31 to play a role in guiding the valve core structure 20 to open and close the valve port 13.

Specifically, the number of guide grooves 23 is a plurality of, and a plurality of guide grooves 23 evenly distributed is in the circumference of guide 25, and through the cooperation between a plurality of guide grooves 23 and guide bar 31, can guide the motion of case structure 20 in pressure chamber 12 more steadily, and it is more accurate when making case structure 20 open or close valve port 13, in time avoids the leakage of gas.

Preferably, in the present application, the number of the guide rods 31 is three, however, in other embodiments, the number of the guide rods 31 may be different, such as four, five or six, according to the structural or space requirement.

Specifically, the guide groove 23 is provided as an arc-shaped groove. And guide bar 31 is cylindricly, and the number of guide bar 31 corresponds with guide way 23, and the arc wall is laminated with guide bar 31 lateral wall, and the number and the shape looks adaptation of guide way 23 and guide bar 31 this moment make the guide effect more smooth and easy stable. Meanwhile, the guide rod 31 is arranged in a cylindrical shape, so that the processing is convenient, the surface of the cylindrical guide rod 31 is smoother, the friction force is less, and the smoothness of the guide rod 31 in guiding the valve core structure 20 to move can be improved; of course, in other embodiments, the guide bar 31 may be provided in a different shape, such as a rectangular parallelepiped.

As shown in fig. 1, the gas self-closing valve 100 further comprises a first magnetic member 40, the first magnetic member 40 is mounted on the guide rod 31, and in this application, the first magnetic member 40 is fixedly connected to the guide rod 31 by screws 41.

Further, the valve core structure 20 includes a valve core unit 21 and a holding portion 22, one end of the valve core unit 21 slidably penetrates through the first magnetic member 40, the other end is used for opening and closing the valve port 13, the holding portion 22 is installed at one end of the valve core unit 21 far away from the valve port 13 and is in magnetic attraction fit with the first magnetic member 40 to drive the valve core unit 21 to move to close the valve port 13; the valve core structure 20 is moved toward the valve port 13 by the attraction force between the first magnetic member 40 and the holding portion 22 of the valve core structure 20, so as to close the valve port 13 and block the gas flow.

Specifically, the holding portion 22 is a magnetic member or made of a ferromagnetic material. It should be noted that the ferromagnetic material can be magnetized only under the action of a small magnetic field, so as to generate magnetic attraction matching; the ferromagnetic material may be nickel or manganese.

Further, the valve core unit 21 includes a valve core 212 and a sealing element 211, the sealing element 211 completely covers one end of the valve core 212 close to the valve port 13, so as to avoid the condition that the valve core 212 is abraded due to direct collision with the valve port 13 when the valve core 212 repeatedly opens or closes the valve port 13; meanwhile, the cost can be reduced, the sealing element 211 is completely covered at one end of the valve core 212 close to the valve port 13, and only the worn sealing element 211 needs to be replaced.

As shown in fig. 1, the gas self-closing valve 100 further comprises a diaphragm structure 50 and a valve rod structure 60, wherein the diaphragm structure 50 is hermetically installed in the valve body 10 and divides the interior of the valve body 10 into a pressure chamber 12 and a valve chamber 11; the diaphragm structure 50 can be changed differently according to the pressure of the pressure chamber 12; the valve rod structure 60 is arranged in the valve cavity 11, one end of the valve rod structure 60 penetrates through the diaphragm structure 50 through the valve cavity 11 and can form magnetic attraction fit with the holding part 22, and the valve rod structure 60 is connected with the diaphragm structure 50 in a riveting mode.

Specifically, the diaphragm structure 50 includes a pressure diaphragm 52 and a fixing plate 51, the pressure diaphragm 52 is hermetically installed in the valve body 10, the fixing plate 51 is welded to a side of the pressure diaphragm 52 away from the pressure chamber 12, and the pressure diaphragm 52 is prevented from being difficult to recover or damaged due to an excessive pressure on one side.

Specifically, the valve rod structure 60 includes a valve rod 61 and a second magnetic member 62, the valve rod 61 is fixedly connected with the second magnetic member 62, the second magnetic member 62 is located in the pressure chamber 12 and can be magnetically matched with the holding portion 22, and the attractive force of the first magnetic member 40 is greater than the attractive force of the second magnetic member 62; through the magnetic attraction and matching between the second magnetic part 62 and the holding part 22, the valve core structure 20 is driven to move towards the direction close to or far away from the valve port 13, so as to close or open the valve port 13; meanwhile, when the pressure of the pressure chamber 12 is too high, the diaphragm structure 50 is protruded in a direction away from the valve port 13, so as to drive the second magnetic member 62 to move, and thus the second magnetic member 62 is separated from the first magnetic member 40; at this time, the magnetic attraction force between the holding portion 22 and the first magnetic member 40 forces the holding portion 22 to be attracted by the first magnetic member 40, so that the valve element structure 20 moves toward the valve port 13 to close the valve port 13, thereby blocking the gas flow.

In this application, diaphragm structure 50 and valve rod structure 60 are connected the back, adopt and carry out the mode of pressure equipment riveting to valve rod 61 to make diaphragm structure 50 and valve rod structure 60 riveted connection, pressure diaphragm 52 and stationary blade 51 riveted connection promptly, valve rod 61 carries out riveted connection with pressure diaphragm 52, stationary blade 51, second magnetic part 62 respectively, strengthens connecting firm compactness.

As shown in fig. 1, the gas self-closing valve 100 further comprises a valve cover 70, wherein the valve cover 70 is hermetically arranged on the pressure diaphragm 52 and is hermetically connected with the valve body 10; the valve cavity 11 is formed between the pressure diaphragm 52 and the valve cover 70; when the pressure of the pressure chamber 12 changes, the pressure diaphragm 52 will change accordingly.

Further, the gas self-closing valve 100 further comprises a lifting button 71, wherein the lifting button 71 is arranged outside the valve cover 70 and connected with the valve rod 61; the distance between the knob 71 and the bonnet 70 is changed correspondingly with the movement of the valve stem 61, or the valve stem 61 moves correspondingly with the movement of the knob 71.

Specifically, the gas self-closing valve 100 further comprises an overflow control member 80 arranged at the inlet 92 of the valve body 10, wherein the overflow control member 80 comprises a flow guide upper cover 81, a flow blocking member 82 and a flow guide lower cover 83; the diversion upper cover 81 is connected with the inner side wall of the inlet 92, and the diversion lower cover 83 extends into the diversion upper cover 81 and is connected with the inner side wall of the diversion upper cover 81 to form an air passage 84; the flow resisting piece 82 is positioned in the air passage 84, and one end of the flow resisting piece extends into the flow guiding upper cover 81, and the other end of the flow resisting piece extends into the flow guiding lower cover 83 to open or close the outlet 93 of the air passage 84;

when the air pressure of the gas input from the inlet 92 of the valve body 10 to the flow guide upper cover 81 is too high, the acting force of the gas on the flow blocking piece 82 drives the flow blocking piece 82 to move so as to seal the outlet of the gas passage 84 of the flow guide lower cover 83; when the pressure of the gas input from the inlet 92 is normal or small, the outlet 93 of the gas path 84 is not closed, so that the gas can be normally circulated.

Further, the gas self-closing valve 100 further includes an elastic element 85, the elastic element 85 is sleeved on the flow blocking element 82, and one end of the elastic element 85 abuts against the flow blocking element 82, and the other end of the elastic element abuts against the lower guide cover 83; when the pressure of the gas input from the inlet 92 of the valve body 10 to the flow guide upper cover 81 is much higher than the pressure of the elastic element 85, the flow blocking element 82 is driven to close the outlet of the gas path 84 of the flow guide lower cover 83; when the pressure of the gas input from the inlet 92 is normal or low, the acting force of the gas on the flow blocking member 82 is smaller than the elastic force of the elastic member 85, so that the outlet of the gas path 84 is not closed, and the gas normally circulates in the valve body 10.

Specifically, the flow guide upper cover 81 is provided with a plurality of flow guide holes (not shown), the plurality of flow guide holes are regularly or irregularly distributed on the flow guide upper cover 81, and the fuel gas can enter the valve body 10 from the flow guide holes.

As shown in fig. 1, the gas self-closing valve 100 further comprises a knob 90 and a ball valve assembly 91, wherein the knob 90 is connected with the ball valve assembly 91 and is located at the outlet 93 of the valve body 10, and the rotation of the knob 90 drives the ball valve assembly 91 to rotate so as to open or close the outlet 93 of the valve body 10; during use of the gas self-closing valve 100, the knob 90 is typically rotated to open the outlet 93 of the valve body 10.

In the present application, according to the structure shown in fig. 1, the operation of opening or closing the valve port 13 is: the lifting button 71 is pulled upwards, at the moment, the valve rod structure 60 and the valve core structure 20 are in an attraction state, and the lifting button 71 drives the valve rod 61, the second magnetic part 62 and the valve core structure 20 to move upwards to open the valve port 13; namely, the upward air pressure of the pressure chamber 12 to the diaphragm structure 50 is equal to the magnetic attraction between the holding part 22 and the first magnetic element 40, and the two are balanced with each other, so that the valve port 13 can be opened, at the moment, the gas can normally circulate through the valve port 13, and at the moment, the gas self-closing valve 100 is in an open state;

in the normal use process, when the pressure below the pressure membrane 52 is too low or no pressure, that is, the pressure of the pressure chamber 12 is too low or no pressure, at this time, the magnetic attraction between the holding part 22 and the first magnetic member 40 is greater than the upward air pressure of the pressure chamber 12 on the membrane structure 50, because the first magnetic member 40 is fixed on the guide rod 31 and is subjected to the limiting action, the holding part 22 drives the valve rod 61 to move towards the direction of the first magnetic member 40, and attracts the first magnetic member 40 to each other, so that the sealing member 211 is attached to the valve port 13 to seal the valve port 13, thereby blocking the circulation of the gas;

when the pressure below the pressure diaphragm 52 is too high, that is, the pressure of the pressure chamber 12 is too high, the pressure diaphragm 52 is lifted up and drives the valve rod 61 to move upward, that is, the upward air pressure of the diaphragm structure 50 given by the pressure chamber 12 is greater than the magnetic attraction force between the holding portion 22 and the second magnetic member 62, so that the second magnetic member 62 is gradually away from the holding portion 22, the magnetic attraction force between the holding portion 22 and the second magnetic member 62 is gradually reduced, at this time, the magnetic attraction force between the holding portion 22 and the first magnetic member 40 is reduced, because the first magnetic member 40 is fixed on the guide rod 31 and is subjected to a limiting effect, the holding portion 22 and the first magnetic member 40 are forced to attract each other, the valve core structure 20 is driven to move downward, and the sealing member 211 is attached to the valve port 13 to seal the valve core structure, so as to block the flow of the gas.

When the flow pressure of the gas input from the inlet 92 of the valve body 10 to the flow guide upper cover 81 is much greater than the pressure of the elastic element 85, the flow blocking element 82 is driven to close the outlet of the gas path 84 of the flow guide lower cover 83; at this time, the pressure of the pressure chamber is reduced, and the working principle is not described in detail here.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.

The features of the above embodiments may be arbitrarily combined, and for the sake of brevity, all possible combinations of the features in the above embodiments are not described, but should be construed as being within the scope of the present specification as long as there is no contradiction between the combinations of the features.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present application and are not used as limitations of the present application, and that suitable changes and modifications of the above embodiments are within the scope of the present application as claimed.

Claims (10)

1. A gas self-closing valve comprises a valve body and a valve core structure, wherein the valve body is internally provided with a pressure cavity, a valve cavity and a valve port, and the valve core structure is arranged in the pressure cavity and can respond to the pressure difference between the pressure cavity and the valve cavity to move in the pressure cavity so as to open and close the valve port;

the gas self-closing valve is characterized by further comprising a guide structure, wherein the guide structure is fixed in the pressure cavity and is in guide fit with the valve core structure, and when the valve core structure moves, the guide structure can guide the movement of the valve core structure.

2. The gas self-closing valve according to claim 1, wherein the guiding structure comprises a guiding rod, one end of the guiding rod is fixed on the valve body and extends along the axis of the valve port towards the valve cavity, and the valve core structure is provided with a matching part which is in guiding matching with the guiding rod.

3. The gas self-closing valve according to claim 2, wherein the guide rod is integrally formed with the valve body, and the engaging portion is a guide groove formed on the valve core structure in an inward concave manner, and the guide groove is in guiding engagement with the guide rod.

4. The gas self-closing valve according to claim 3, wherein said spool structure is provided with a guide member, said engagement portion being located on said guide member.

5. The gas self-closing valve according to claim 4, wherein the number of the guide grooves is multiple, and the multiple guide grooves are uniformly distributed on the circumference of the guide piece.

6. The gas self-closing valve according to claim 3, wherein said guide slot is an arc slot and is attached to the outer side wall of said guide rod.

7. The gas self-closing valve according to claim 2, further comprising a first magnetic member, wherein the first magnetic member is mounted on the guide rod, the valve core structure comprises a valve core unit and a holding portion, one end of the valve core unit slidably penetrates through the first magnetic member, the other end of the valve core unit is used for opening and closing the valve port, and the holding portion is mounted at one end of the valve core unit, which is far away from the valve port, and is in magnetic attraction fit with the first magnetic member to drive the valve core unit to move to close the valve port.

8. Gas self-closing valve according to claim 7, wherein said holding part is a magnetic piece or made of ferromagnetic material.

9. The gas self-closing valve according to claim 7, further comprising a diaphragm structure sealingly mounted within said valve body and dividing the interior of said valve body into said pressure chamber and said valve chamber, and a valve stem structure;

the valve rod structure is arranged in the valve cavity, one end of the valve rod structure penetrates through the valve cavity and is arranged on the diaphragm structure, the valve rod structure can form magnetic attraction matching with the sucking part, and the valve rod structure is connected with the diaphragm structure in a riveting mode.

10. The gas self-closing valve according to claim 9, wherein the valve stem structure comprises a second magnetic member, the second magnetic member is located in the pressure chamber and can be magnetically engaged with the holding portion, and the attraction force of the first magnetic member is greater than that of the second magnetic member.

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