CN117287538A

CN117287538A - Gas safety valve

Info

Publication number: CN117287538A
Application number: CN202311238348.XA
Authority: CN
Inventors: 刘德银
Original assignee: Beijing Xinfengtai Gas Equipment Co ltd
Current assignee: Beijing Xinfengtai Gas Equipment Co ltd
Priority date: 2023-09-25
Filing date: 2023-09-25
Publication date: 2023-12-26

Abstract

The invention belongs to the technical field of valves, and particularly relates to a gas safety valve, which comprises a left pipe body and a right pipe body, wherein limit assemblies, valve core assemblies, a first sleeve assembly and a second sleeve assembly are arranged in the left pipe body and the right pipe body; the limiting component can avoid opening the valve under lower pressure to cause abnormal gas use, and can also avoid frequent opening and closing of the gas valve to cause abnormal gas supply when the gas pressure is near the opening pressure threshold value; the invention has the advantages of simple structure, small volume, good sealing performance, adjustable gas pressure, strong applicability and the like.

Description

Gas safety valve

Technical Field

The invention relates to the technical field of gas valves, in particular to a gas safety valve.

Background

In resident gas pipelines, a gas safety valve is an extremely important safety guarantee component and is generally arranged between a gas household pipeline and a gas stove hose, and is used for closing the pipeline when unexpected situations such as overpressure, undervoltage, leakage and the like occur in the gas pipeline, so that gas leakage and fire disaster are avoided.

In the prior art, various gas safety valves are arranged, the valve can be basically closed under unexpected conditions, but various problems exist, firstly, a common gas safety valve adopts a diaphragm valve to sense gas pressure so as to control the valve to be opened and closed, the diaphragm valve is usually large in size, the installation and maintenance are not facilitated in a narrow place of a kitchen, a plurality of parts such as a valve cover and a joint are arranged on a valve body, a plurality of joints needing sealing are usually arranged on a valve shell, and once the sealing is not tight, the risk of gas leakage is high. Secondly, in the gas pipeline, when under-pressure occurs, the reasons may be that the supply is insufficient or the upstream pipeline leaks due to the peak period of gas use, and at the moment, the gas pressure is insufficient for normal use, and the under-pressure is normally closed directly; when the gas pressure increases, the gas pressure may be in a low-valley time window of gas use, and if the gas supply pressure slightly increases, although safety risks are not generated, the gas safety valve may be directly closed, so that the use of gas by a user is affected. And when the gas pressure fluctuation occurs, the existing gas safety valve can only be opened and closed, and cannot distinguish normal pressure fluctuation and abnormal pressure fluctuation and take the best treatment measures, so that the gas safety valve has poor functionality.

Disclosure of Invention

The invention aims to solve the problems that a gas safety valve in the prior art is complex in structure, large in size, high in leakage risk, incapable of being adjusted due to being opened and closed, poor in functionality and the like.

In order to achieve the above purpose, the invention provides a gas safety valve, which comprises a left pipe body and a right pipe body, wherein the left pipe body is fixedly connected with the right pipe body, one end of the left pipe body is provided with an inlet channel, one end of the right pipe body is provided with an outlet channel, the inner wall of the left pipe body is provided with a first annular boss, an overflow cavity communicated with the inlet channel is arranged in the first annular boss, one end of the left pipe body, which is close to the right pipe body, is provided with a first mounting cavity, a valve core assembly is arranged in the first mounting cavity, one end of the valve core assembly is fixedly connected with a connecting rod, and the other end of the valve core assembly is in sealing abutting contact with the right end face of the first annular boss; the inner wall of the right pipe body is fixedly provided with a supporting frame, the supporting frame is provided with a central hole and a through hole, one end of the connecting rod, far away from the valve core assembly, penetrates through the central hole in a sliding manner and is fixedly connected with the end part of the first sleeve assembly, the end part of the first sleeve assembly is a closed end, a sleeve inner cavity is formed in the first sleeve assembly, and a plurality of throttling holes are formed in the side wall of the first sleeve assembly; a return spring is sleeved on the connecting rod, one end of the return spring is abutted against the supporting frame, and the other end of the return spring is abutted against the valve core assembly; the inner wall of the right pipe body is provided with a second annular boss, a second installation cavity is formed in the second annular boss, a third installation cavity is formed in one end, close to the left pipe body, of the right pipe body, and one end of the first sleeve assembly can slide to the second installation cavity and is attached to the inner wall of the second annular boss; the outlet channel is internally provided with a second sleeve assembly in a threaded manner, and one end of the second sleeve assembly penetrates through the second mounting cavity to extend into the sleeve inner cavity and is in sliding connection with the inner wall of the first sleeve assembly; the second sleeve assembly comprises a second sleeve body, an annular decompression part and a threaded connection part, the threaded connection part is fixedly arranged at the end part of the second sleeve body, the annular decompression part is fixedly arranged on the inner layer of the second sleeve body, an axial through central flow passage is formed in the annular decompression part, the annular decompression part can decompress fuel gas, the second sleeve assembly is in threaded connection with the inner wall of the right pipe body through the threaded connection part, a plurality of through holes are formed in the second sleeve body, and the central flow passage is communicated with an outlet passage.

Preferably, the valve core assembly comprises a valve rod and a valve core sleeve, wherein the valve rod comprises a valve rod tip, a valve rod connecting section, a valve rod protruding section and a valve rod threaded connecting section which are sequentially connected, the valve rod threaded connecting section is connected with the connecting rod through threads, the valve core sleeve limiting sleeve is arranged on the valve core sleeve, and the valve core sleeve can form a seal with the right end face of the first annular boss; the tip of the valve rod is provided with a limiting component.

Preferably, the limiting component comprises a torsion spring, a first limiting part and a second limiting part, the tip end of the valve rod is located at one end of the valve rod facing the inlet channel, the torsion spring, the first limiting part and the second limiting part are respectively connected to the tip end of the valve rod in a rotating mode through rotating shafts, two ends of the torsion spring respectively lean against the first limiting part and the second limiting part, and when the valve core component is in a closed state, the free ends of the first limiting part and the second limiting part lean against the left end face of the first annular boss respectively in opposite directions.

Preferably, a step surface is arranged between the valve rod tip and the valve rod connecting section, and the step surface is used for limiting the rotation of the first limiting piece and the second limiting piece.

Preferably, when the valve core assembly is in a closed state, all the orifices are directly communicated with the central flow passage through the inner cavity of the sleeve; when the valve core assembly is in a first opening state, one part of the throttle holes are directly communicated with the central flow passage through the inner cavity of the sleeve, and the other part of the throttle holes are communicated with the central flow passage through the through hole of the second sleeve body and the annular pressure reducing part; when the valve core assembly is in a second opening state, all orifices are communicated with the central flow passage through the through hole of the second sleeve body and the annular pressure reducing part; when the valve core assembly is in a third opening state, all the orifices slide into the second mounting cavity and are shielded and sealed by the inner wall of the second annular boss.

Preferably, when the valve core assembly is in the third opening state, the first limiting piece and the second limiting piece are abutted against the right end face of the first annular boss.

Preferably, one end of the second sleeve assembly extends into the third mounting cavity.

Preferably, the annular pressure reducing portion is a labyrinth type pressure reducing sleeve.

Preferably, the inner end of the first sleeve assembly is provided with a sleeve gasket.

Preferably, an adjusting gasket is arranged between the reset spring and the valve core assembly.

The gas safety valve provided by the invention has the beneficial effects that:

1. through setting up case subassembly, first sleeve subassembly, second sleeve subassembly, not only can realize the gas superpressure, reliably close when under-pressure, can also reduce the gas pressure through first sleeve subassembly, second sleeve subassembly when the superpressure is not too much, keep the normal use of gas, when the gas superpressure is too big, carry out reliable close again.

2. Through rotating threaded connection portion, change the position of second sleeve subassembly, can adjust the relative position of first sleeve subassembly and second sleeve subassembly, adjust the gas flow area under different gas pressure to adapt to different gas pipeline and gas-cooker, improve the suitability of gas relief valve.

3. Through setting up spacing subassembly, just opening the valve under lower pressure can be avoided, the gas is used unusually, simultaneously, also can avoid the gas pressure to open and close frequently when fluctuation near opening pressure threshold value, causes the gas supply unusual.

4. The step surface is arranged between the tip end of the valve rod and the connecting section of the valve rod, when the limiting component reaches the first installation cavity, the valve core component is basically locked, so that when the excessive gas pressure occurs, the gas safety valve is reliably closed, and safety accidents are avoided.

5. The sleeve gasket can buffer head-on collision of the first sleeve assembly and the second sleeve assembly, and can improve the tightness of the first sleeve assembly when the first sleeve assembly is closed; the pretightening force of the reset spring is adjusted by increasing or decreasing the thickness or the number of the adjusting gaskets, so that the opening pressure of the gas safety valve is adjusted.

6. The valve is connected by adopting the left pipe body and the right pipe body, the volume is small, the number of interfaces is small, and the possibility of leakage is lower.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:

FIG. 1 is a schematic view of the gas valve of the present invention in a closed state;

FIG. 2 is a schematic view of the internal components of the gas valve of the present invention;

FIG. 3 is a schematic view of a spacing assembly according to the present invention;

fig. 4 is a schematic view of the structure of the gas valve in the first opening state according to the present invention;

fig. 5 is a schematic view of the structure of the gas valve in the second opening state according to the present invention;

fig. 6 is a schematic view of the structure of the gas valve in the third opening state according to the present invention;

fig. 7 is a schematic view of the structure of the gas valve according to the second embodiment of the present invention in a third opening state;

fig. 8 is a schematic view showing the structure of a gas valve in a closed state according to a third embodiment of the present invention;

fig. 9 is a schematic view of the structure of a gas valve according to a third embodiment of the present invention in a third opening state.

In the figure: left tube 1, inlet channel 101, first annular boss 102, over-flow chamber 103, first installation chamber 104, right tube 2, outlet channel 201, second annular boss 202, second installation chamber 203, third installation chamber 204, spacing assembly 3, torsion spring 301, first spacing element 302, second spacing element 303, valve element assembly 4, valve stem tip 401, valve stem connecting section 402, valve stem protruding section 403, valve stem threaded connecting section 404, valve element sleeve 405, return spring 5, connecting rod 6, support frame 7, first sleeve assembly 8, first sleeve body 801, orifice 802, sleeve inner cavity 803, sleeve gasket 804, second sleeve assembly 9, second sleeve body 901, annular relief 902, threaded connection 903, central flow passage 904, adjustment gasket 10.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments herein more apparent, the technical solutions in the embodiments herein will be clearly and completely described below with reference to the accompanying drawings in the embodiments herein, and it is apparent that the described embodiments are some, but not all, embodiments herein. All other embodiments, based on the embodiments herein, which a person of ordinary skill in the art would obtain without undue burden, are within the scope of protection herein. It should be noted that, without conflict, the embodiments and features of the embodiments herein may be arbitrarily combined with each other.

Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, it is the meaning of "including but not limited to".

Referring to fig. 1-6, a first embodiment of the present invention is provided, and a gas safety valve is provided, which comprises a left pipe body 1 and a right pipe body 2, wherein the left pipe body 1 is fixedly connected with the right pipe body 2, one end of the left pipe body 1 is provided with an inlet channel 101, one end of the right pipe body 2 is provided with an outlet channel 201, the inner wall of the left pipe body 1 is provided with a first annular boss 102, the first annular boss 102 is internally provided with an overflow cavity 103 communicated with the inlet channel 101, one end of the left pipe body 1, which is close to the right pipe body 2, is provided with a first mounting cavity 104, a valve core assembly 4 is mounted in the first mounting cavity 104, one end of the valve core assembly 4 is fixedly connected with a connecting rod 6, and the other end of the valve core assembly 4 is in sealing abutting against the right end face of the first annular boss 102; the inner wall of the right pipe body 2 is fixedly provided with a supporting frame 7, the supporting frame 7 is provided with a central hole and a through hole, one end of the connecting rod 6 far away from the valve core assembly 4 can pass through the central hole in a sliding way and is fixedly connected with the end part of the first sleeve assembly 8, the end part of the first sleeve assembly 8 is a closed end, the inside of the first sleeve assembly 8 is provided with a sleeve inner cavity 803, and the side wall of the first sleeve assembly 8 is provided with a plurality of orifices 802; the connecting rod 6 is sleeved with a return spring 5, one end of the return spring 5 is abutted against the supporting frame 7, and the other end is abutted against the valve core assembly 4; the inner wall of the right pipe body 2 is provided with a second annular boss 202, a second installation cavity 203 is formed in the second annular boss 202, a third installation cavity 204 is formed in one end, close to the left pipe body 1, of the right pipe body 2, and one end of the first sleeve assembly 8 can slide to the second installation cavity 203 and is attached to the inner wall of the second annular boss 202; the outlet channel 201 is internally provided with a second sleeve assembly 9 in a threaded manner, one end of the second sleeve assembly 9 penetrates through the second mounting cavity 203 to extend into the sleeve inner cavity 803 and is in sliding connection with the inner wall of the first sleeve assembly 8, and one end of the second sleeve assembly 9 extends into the third mounting cavity 204; the second sleeve assembly 9 comprises a second sleeve body 901, an annular decompression part 902 and a threaded connection part 903, the threaded connection part 903 is fixedly arranged at the end part of the second sleeve body 901, the annular decompression part 902 is fixedly arranged on the inner layer of the second sleeve body 901, an axial through central flow passage 904 is formed in the annular decompression part 902, the annular decompression part 902 can decompress fuel gas, the second sleeve assembly 9 is in threaded connection with the inner wall of the right pipe body 2 through the threaded connection part 903, a plurality of through holes are formed in the second sleeve body 901, and the central flow passage 904 is communicated with the outlet passage 201. In the invention, through the structure, when the gas pressure is low, the valve core assembly 4 cannot be pushed away, and when the valve core assembly 4 is in a closed state, all the orifices 802 are directly communicated with the central flow passage 904 through the sleeve inner cavity 803; when the gas pressure is normal pressure, the valve core assembly 4 is in a first opening state, the gas pressure pushes away the valve core assembly, so that the valve core assembly and the first sleeve assembly move rightwards, the orifice of the first sleeve assembly is partially covered by the second sleeve assembly, one part of the orifice 802 is directly communicated with the central flow passage 904 through the sleeve inner cavity 803, the other part of the orifice 802 is communicated with the central flow passage 904 through the through hole of the second sleeve body 901 and the annular decompression part 902, at the moment, partial gas flow passage is not decompressed, and the gas can keep better flow property, so that the gas supply under the normal gas pressure is realized; when the gas pressure is greater than the normal pressure but the pressure is not too great, the valve core assembly 4 is in the second opening state, the gas pressure enables the valve core assembly and the first sleeve assembly to move further rightward, so that the orifices of the first sleeve assembly are all covered by the second sleeve assembly, all the orifices 802 are communicated with the central flow passage 904 through the through holes of the second sleeve body 901 and the annular pressure reducing part 902, at this time, all the gas channels are reduced in pressure through the annular pressure reducing part, so that the higher gas pressure can be reduced to the normal pressure interval, at this time, although the inflowing gas pressure is higher, the gas can still be normally used through pressure reduction, and potential safety hazards cannot be generated; when the gas pressure is too large, the valve core assembly 4 is in the third opening state, the gas pressure is not suitable for being used after being reduced, the hose is damaged, leakage and abnormal use of the gas stove are easier to occur, and therefore, all the orifices 802 slide into the second installation cavity 203 in the third opening state and are shielded and sealed by the inner wall of the second annular boss 202. In addition, the one end of second sleeve subassembly is equipped with threaded connection portion, can change the position of second sleeve subassembly through rotating threaded connection portion, like this, just so can adjust the relative position of first sleeve subassembly and second sleeve subassembly, if rotatory second sleeve subassembly makes its outside remove, then under the same gas pressure, the fluxion of fluid passage between first sleeve subassembly and the second sleeve subassembly can be higher, otherwise, under the same gas pressure, the fluxion of fluid passage between first sleeve subassembly and the second sleeve subassembly can be lower, consequently, can adjust the gas flow area under different gas pressures through threaded connection portion, with adaptation nature of adaptation gas pipe way and gas-cooker, the improvement gas safety valve.

The valve core assembly 4 comprises a valve rod and a valve core sleeve 405, the valve rod comprises a valve rod tip 401, a valve rod connecting section 402, a valve rod protruding section 403 and a valve rod threaded connecting section 404 which are sequentially connected, the valve rod threaded connecting section 404 is connected with the connecting rod 6 through threads, the valve core sleeve 405 is arranged on the valve core sleeve 405 in a limiting sleeve mode, and the valve core sleeve 405 can form sealing with the right end face of the first annular boss 102; the valve stem tip 401 is provided with a stop assembly 3. Through the structure, the valve core assembly can be conveniently installed, the tightness between the valve core assembly and the first annular boss is ensured, and the reliability of closing the valve under the low pressure state is realized.

The limiting assembly 3 comprises a torsion spring 301, a first limiting piece 302 and a second limiting piece 303, the valve rod tip 401 is located at one end of the valve rod facing the inlet channel 101, the torsion spring 301, the first limiting piece 302 and the second limiting piece 303 are respectively connected to the valve rod tip 401 through rotating shafts in a rotating mode, two ends of the torsion spring 301 respectively lean against the first limiting piece 302 and the second limiting piece 303, and when the valve core assembly 4 is in a closed state, the free ends of the first limiting piece 302 and the second limiting piece 303 lean against the left end face of the first annular boss 102 respectively in opposite directions. According to the invention, through the limiting assembly, the elastic force of the torsion spring on the two limiting members is utilized, the limiting members lean against the first annular boss to provide a force in the closing direction for the valve core assembly, the pressure threshold value of opening of the valve core assembly can be improved, after the valve core assembly is opened, the two limiting members move into the overflow cavity and lean against the inner wall of the first annular boss, the friction force between the two limiting members is ignored, at the moment, the two limiting members do not generate a force for pushing or obstructing the movement of the valve core assembly, when the gas pressure is reduced to the opening pressure threshold value, the valve core assembly still keeps an open state, and only when the gas pressure is reduced to a certain value below the opening pressure threshold value, the valve core assembly is closed under the action of the reset spring, namely, the opening pressure of the valve core assembly is larger than the closing pressure, so that the valve is opened under lower pressure, abnormal gas use caused by frequent fluctuation of the gas valve when the gas pressure is in the vicinity of the opening pressure threshold value can be avoided.

Referring to fig. 7, a second embodiment of the present invention is provided, which is different from the first embodiment in that the stem tip 401 and the stem connecting section 402 have a stepped surface therebetween for restricting the rotation of the first stopper 302 and the second stopper 303; when the valve core assembly 4 is in the third opening state, the first limiting piece 302 and the second limiting piece 303 are abutted against the right end face of the first annular boss 102. When the valve core assembly moves to the third opening state, if the gas pressure is further increased, the valve core assembly can still move towards the outlet direction, then the limiting assembly can move out of the flow cavity and reach the first installation cavity, and the first limiting piece and the second limiting piece can be opened again under the action of the elasticity of the torsion spring and lean against the right end face of the first annular boss, the first limiting piece and the second limiting piece are limited between the right end face of the first annular boss and the step face of the valve rod connecting section, the orifice of the first sleeve assembly is completely blocked by the second annular boss, the gas at the first sleeve assembly cannot flow towards the outlet channel, at the moment, even if the gas pressure is reduced, the valve core assembly can not move leftwards any more, the moving space of the valve core assembly rightwards is extremely limited, the valve core assembly is basically locked, the gas safety valve is closed at the first sleeve assembly, and when the gas pressure is too high, the gas safety valve is reliably closed, and safety accidents are avoided.

The annular pressure reducing portion 902 is a labyrinth type pressure reducing sleeve, so that the pressure reducing effect of the annular pressure reducing portion on fuel gas can be improved;

referring to fig. 8 and 9, a third embodiment of the present invention is provided, which is different from the first and second embodiments in that a sleeve gasket 804 is provided at an inner end portion of the first sleeve member 8, the sleeve gasket 804 is made of a rubber material, the sleeve gasket 804 can cushion a head-on collision of the first and second sleeve members, and can improve sealability when the first sleeve member is closed.

An adjusting gasket 10 is arranged between the reset spring 5 and the valve core assembly 4, and the pretightening force of the reset spring can be adjusted by increasing or decreasing the thickness or the number of the adjusting gaskets, so that the opening pressure of the gas safety valve can be adjusted.

While preferred embodiments herein have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all alterations and modifications as fall within the scope herein.

It will be apparent to those skilled in the art that various modifications and variations can be made herein without departing from the spirit and scope of the disclosure. Thus, given that such modifications and variations herein fall within the scope of the claims herein and their equivalents, such modifications and variations are intended to be included herein.

Claims

1. The gas safety valve comprises a left pipe body (1) and a right pipe body (2), wherein the left pipe body (1) is fixedly connected with the right pipe body (2), one end of the left pipe body (1) is provided with an inlet channel (101), one end of the right pipe body (2) is provided with an outlet channel (201), and is characterized in that,

the inner wall of the left pipe body (1) is provided with a first annular boss (102), the first annular boss (102) is internally provided with a flow passing cavity (103) communicated with the inlet channel (101), one end, close to the right pipe body (2), of the left pipe body (1) is provided with a first mounting cavity (104), a valve core assembly (4) is mounted in the first mounting cavity (104), one end of the valve core assembly (4) is fixedly connected with the connecting rod (6), and the other end of the valve core assembly (4) is in sealing abutting contact with the right end face of the first annular boss (102);

the valve is characterized in that a supporting frame (7) is fixedly arranged on the inner wall of the right pipe body (2), the supporting frame (7) is provided with a central hole and a through hole, one end of the connecting rod (6) far away from the valve core assembly (4) penetrates through the central hole in a sliding mode and is fixedly connected with the end part of the first sleeve assembly (8), the end part of the first sleeve assembly (8) is a closed end, a sleeve inner cavity (803) is formed in the first sleeve assembly (8), and a plurality of throttling holes (802) are formed in the side wall of the first sleeve assembly (8); a return spring (5) is sleeved on the connecting rod (6), one end of the return spring (5) is abutted against the supporting frame (7), and the other end of the return spring is abutted against the valve core assembly (4);

the inner wall of the right pipe body (2) is provided with a second annular boss (202), a second installation cavity (203) is formed in the second annular boss (202), a third installation cavity (204) is formed in one end, close to the left pipe body (1), of the right pipe body (2), and one end of the first sleeve assembly (8) can slide to the second installation cavity (203) and is attached to the inner wall of the second annular boss (202);

the outlet channel (201) is internally provided with a second sleeve assembly (9) in a threaded manner, and one end of the second sleeve assembly (9) penetrates through the second mounting cavity (203) to extend into the sleeve inner cavity (803) and is in sliding connection with the inner wall of the first sleeve assembly (8);

the second sleeve assembly (9) comprises a second sleeve body (901), an annular decompression part (902) and a threaded connection part (903), wherein the threaded connection part (903) is fixedly arranged at the end part of the second sleeve body (901), the annular decompression part (902) is fixedly arranged on the inner layer of the second sleeve body (901), an axial penetrating central flow passage (904) is formed in the annular decompression part (902), the annular decompression part (902) can decompress fuel gas, the second sleeve assembly (9) is in threaded connection with the inner wall of the right pipe body (2) through the threaded connection part (903), a plurality of through holes are formed in the second sleeve body (901), and the central flow passage (904) is communicated with the outlet passage (201).

2. The gas safety valve according to claim 1, wherein the valve core assembly (4) comprises a valve rod and a valve core sleeve (405), the valve rod comprises a valve rod tip (401), a valve rod connecting section (402), a valve rod protruding section (403) and a valve rod threaded connecting section (404) which are sequentially connected, the valve rod threaded connecting section (404) is in threaded connection with the connecting rod (6), the valve core sleeve (405) is arranged on the valve core sleeve (405) in a limiting sleeve manner, and the valve core sleeve (405) can form a seal with the right end face of the first annular boss (102); a limit component (3) is arranged on the valve rod tip (401).

3. A gas safety valve according to claim 2, wherein the limit assembly (3) comprises a torsion spring (301), a first limit member (302) and a second limit member (303), the valve rod tip (401) is located at one end of the valve rod facing the inlet channel (101), the torsion spring (301), the first limit member (302) and the second limit member (303) are respectively connected to the valve rod tip (401) through rotation shafts, two ends of the torsion spring (301) respectively lean against the first limit member (302) and the second limit member (303), and when the valve core assembly (4) is in a closed state, free ends of the first limit member (302) and the second limit member (303) respectively lean against the left end face of the first annular boss (102) in opposite directions.

4. A gas safety valve according to claim 3, characterized in that the valve stem tip (401) and the valve stem connecting section (402) have a stepped surface therebetween for limiting the rotation of the first (302) and second (303) stop members.

5. The gas safety valve according to claim 4, wherein when the valve element assembly (4) is in a closed state, all orifices (802) are directly connected to the central flow passage (904) through the sleeve inner cavity (803);

when the valve core assembly (4) is in a first opening state, one part of the throttle holes (802) are directly communicated with the central flow passage (904) through the sleeve inner cavity (803), and the other part of the throttle holes (802) are communicated with the central flow passage (904) through the through hole of the second sleeve body (901) and the annular pressure reducing part (902);

when the valve core assembly (4) is in a second opening state, all orifices (802) are communicated with the central flow passage (904) through the through holes of the second sleeve body (901) and the annular pressure reducing part (902);

when the valve core assembly (4) is in a third opening state, all the orifices (802) slide into the second mounting cavity (203) and are shielded and sealed by the inner wall of the second annular boss (202).

6. A gas safety valve according to claim 5, wherein,

when the valve core assembly (4) is in a third opening state, the first limiting piece (302) and the second limiting piece (303) are abutted against the right end face of the first annular boss (102).

7. A gas safety valve according to claim 1, characterized in that one end of the second sleeve assembly (9) protrudes into the third mounting chamber (204).

8. The gas safety valve according to claim 1, wherein the annular pressure relief portion (902) is a labyrinth relief sleeve.

9. A gas safety valve according to claim 1, wherein the inner end of the first sleeve assembly (8) is provided with a sleeve gasket (804).

10. A gas safety valve according to claim 1, characterized in that an adjusting washer (10) is arranged between the return spring (5) and the valve element assembly (4).