Double-pipeline anti-explosion valve

Abstract

The utility model discloses a double-pipeline anti-explosion valve. The double-pipeline anti-explosion valve comprises a valve body, a valve element and two position maintaining mechanisms. A sliding channel, two installation spaces, two output channels, an input channel and two backflow channels are formed in the valve body, the two installation spaces are communicated with two ports of the sliding channel respectively, the input channel is communicated with the two output channels through the sliding channel, and the two backflow channels are communicated with the two output channels and the sliding channel respectively. The valve element can be movably installed in the sliding channel in the axial direction of the sliding channel, part of the valve element extends towards the periphery in the radial direction of the valve element to form two blocking bosses and an opening and closing boss located between the two blocking bosses, and the opening and closing boss and the two blocking bosses are spaced by a preset distance. The peripheral walls of the blocking boss and the opening and closing boss abut against the inner wall of the sliding channel in a sealed mode. The two position maintaining mechanisms are both kept in a compressed state and are installed in the two installation spaces in a compressible mode respectively, and each position maintaining mechanism and the corresponding blocking boss are spaced by a preset distance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to a double-pipeline explosion-proof valve. BACKGROUND

[0002] The supply device for storing fluid is communicated with the split equipment through a pipeline, so that the fluid stored by the supply device is transported to the split equipment through pumping. Once the pipeline is broken, the transportation work must be stopped so as to be maintained by the staff. Before the staff finds that the pipeline is broken, the pump is still working, which causes the fluid to continuously leak out and causes resource waste.

[0003] In order to facilitate maintenance after the pipeline is broken, the explosion-proof valve is currently installed on the pipeline. The existing explosion-proof valve is provided with a single inlet and a single outlet. When the pipeline connected with the outlet is broken, the valve core of the explosion-proof valve can block the flow path communicated with the outlet to prevent the oil in the hydraulic pipeline from continuously leaking out. However, the pump still needs to be stopped to perform the maintenance work, which affects the normal fluid transportation and has a single function. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the above technical problems and achieve at least one advantage of the present application, the present application provides a double-pipeline explosion-proof valve, which comprises:

[0005] A valve body forms a sliding channel, two installation spaces, two output channels, an input channel and two return flow channels. The two installation spaces are respectively communicated with two ports of the sliding channel. The input channel is communicated with the two output channels through the sliding channel. The two return flow channels are respectively communicated with the two output channels and the sliding channel.

[0006] A valve core is movably installed in the sliding channel along the axial direction of the sliding channel. Part of the valve core extends outward along the radial direction of the valve core to form two blocking bosses and an opening and closing boss located between the two blocking bosses. The opening and closing boss is spaced apart from the two blocking bosses by a predetermined distance. The outer wall of the blocking boss and the opening and closing boss is in sealing abutment with the inner wall of the sliding channel.

[0007] Two position maintaining mechanisms are respectively and compressibly installed in the two installation spaces in a compressed state. The position maintaining mechanism has a restoring tendency when compressed. The two position maintaining mechanisms are respectively opposite to the two end surfaces of the valve core. Each position maintaining mechanism is spaced apart from the opposite blocking boss by a predetermined distance.

[0008] The double-pipeline explosion-proof valve has a normally open state and a half-open state: when the double-pipeline explosion-proof valve is in the normally open state, the gaps between the two blocking bosses and the opening and closing boss are in communication with the input channel, and the gaps between the two blocking bosses and the opening and closing boss are in communication with the two output channels, fluid flows to the two output channels through the input channel and the gaps between the two blocking bosses and the opening and closing boss respectively, part of the fluid flows out through the pipeline connected with the two output channels, and the other part of the fluid flows into the gaps between the two blocking bosses and the position maintaining mechanisms adjacent to the blocking bosses respectively through the two return channels in communication with the two output channels; when the double-pipeline explosion-proof valve is in the half-open state, the gaps between the two blocking bosses and the opening and closing boss are in communication with the input channel, the gap between one of the blocking bosses and the opening and closing boss is in communication with the corresponding output channel, and the gap between the other blocking boss and the opening and closing boss is staggered with the corresponding output channel.

[0009] According to an embodiment of the present application, the input channel is divided into a total flow passage and two branch flow passages in communication with the total flow passage, and the ends of the two branch flow passages away from the total flow passage correspond at least partially to the gaps between the two blocking bosses and the opening and closing boss.

[0010] According to an embodiment of the present application, the valve body has two blocking walls on the inner wall forming the sliding channel, the blocking walls are formed between the port where the output channel is in communication with the sliding channel and the port where the return channel in communication with the output channel is in communication with the sliding channel, and the two blocking bosses are in abutment with the two blocking walls respectively; when the double-pipeline explosion-proof valve is in the normally open state, the opening and closing boss is staggered with the two blocking walls; when the double-pipeline explosion-proof valve is in the half-open state, the opening and closing boss is in sealing abutment with one of the blocking walls.

[0011] According to an embodiment of the present application, the blocking boss comprises a blocking part and a flow guiding part, the blocking part and the flow guiding part are connected, the flow guiding part faces the opening and closing boss, the blocking part faces the opposite position maintaining mechanism, and the radial cross-sectional diameter of the flow guiding part gradually increases along the direction from the end facing the opening and closing boss to the blocking part.

[0012] According to an embodiment of the present application, the opening and closing boss further forms at least one material reducing groove, and the opening and closing boss is divided into two parts through the material reducing groove.

[0013] According to an embodiment of the present application, in the normally open state, the two ends of the valve core are in abutment with the two position maintaining mechanisms respectively; in the half-open state, one end face of the valve core is separated from the corresponding position maintaining mechanism.

[0014] According to one embodiment of this application, each of the position maintaining mechanisms includes an elastic element, which is elastically deformable and mounted in the mounting space, with the elastic element remaining opposite to the end face of the valve core.

[0015] According to one embodiment of this application, the position maintaining mechanism further includes a pressure member, the elastic member being retractably mounted in the mounting space in a compressed state, the pressure member being located between the elastic member and the valve core, and the pressure member abutting against the elastic member, the end face of the pressure member facing away from the elastic member facing the valve core, and the area of ​​the end face of the pressure member facing the elastic member being larger than the radial cross-sectional dimension of the elastic member.

[0016] According to one embodiment of this application, the valve core forms a guide structure on its end face, and the pressure-applying component forms an assembly structure. The guide structure is adapted to the size and shape of the assembly structure. When the dual-pipeline explosion-proof valve is in the normally open state, the guide structure is inserted into the assembly structure. When the dual-pipeline explosion-proof valve switches from the normally open state to the half-open state, the guide structure moves in the direction of being withdrawn from the assembly structure.

[0017] According to one embodiment of this application, the valve body forms a first limiting step and a second limiting step. The first limiting step is located on the movement path of the pressure member being pushed and reset by the elastic member. When the dual-pipe explosion-proof valve is in the normally open state, the elastic member pushes the pressure member to abut against the first limiting step. The second limiting step is located on the movement path of the pressure member compressing the elastic member. When the dual-pipe explosion-proof valve is in the half-open state, the valve core presses against a position maintaining mechanism, and the pressure member included in the position maintaining mechanism abuts against the corresponding second limiting step. Attached Figure Description

[0018] Figure 1 A cross-sectional view of the dual-pipeline explosion-proof valve described in this application in its normally open state is shown.

[0019] Figure 2 A cross-sectional view of the dual-pipeline explosion-proof valve described in this application in the half-open state is shown.

[0020] Figure 3 A cross-sectional view of the valve core described in this application is shown.

[0021] Figure 4 It shows Figure 2 An enlarged schematic diagram of part A in the middle.

[0022] Figure 5 It shows Figure 2 Enlarged schematic diagram of part B. DETAILED DESCRIPTION

[0023] The following description is presented to enable any person skilled in the art to practice the application as claimed. Preferred embodiments are presented in the following description only as examples and modifications thereto can be made by those skilled in the art without departing from the spirit and scope of the application claimed. The present application is well suited to achieving this object with the objects described below will become readily apparent to those skilled in the art from the following description.

[0024] Those skilled in the art will appreciate that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like as can be used herein, merely describe orientations in relation to the application as the same can be shown in the drawings and should not be construed to limit the present application, unless otherwise specified.

[0025] It can be understood that the term "one" should be understood as "at least one" or "one or more" in the context of the present application, that is, the number of an element can be one in one embodiment, and the number of the element can be multiple in another embodiment, and the term "one" cannot be understood as a limitation on the number.

[0026] Reference Figures 1 to 5 A double-pipe explosion-proof valve according to a preferred embodiment of the present application will be described in detail below. The double-pipe explosion-proof valve includes a valve body 10, a valve core 20, and two position maintaining mechanisms 30.

[0027] The valve body 10 forms a sliding channel 101 and two installation spaces 102, wherein the two installation spaces 102 respectively communicate with two ports of the sliding channel 101. The valve core 20 is movably installed in the sliding channel 101 along the axial direction of the sliding channel 101, and two end portions of the valve core 20 respectively extend into the corresponding installation space 102 through the two ports of the sliding channel 101. The valve body 10 further forms two output channels 103 communicating with the sliding channel 101, an input channel 104 communicating with the sliding channel 101, and two return channels 105, wherein the input channel 104 communicates with the two output channels 103 through the sliding channel 101, and the two return channels 105 respectively communicate with the two output channels 103 and the sliding channel 101. The valve body 10 is connected with a supply device and a dispensing device through pipes, wherein the input channel 104 formed by the valve body 10 communicates with the supply device through a pipe, and the supply device stores fluid. The two output channels 103 formed by the valve body 10 respectively communicate with the dispensing device through pipes. The fluid stored in the supply device is delivered to the dispensing device through the double-pipe explosion-proof valve.

[0028] Specifically, part of the valve core 20 extends along the radial direction of the valve core 20 outwardly to form two blocking bosses 21 and an opening and closing boss 22 located between the two blocking bosses 21, and the opening and closing boss 22 is spaced apart from the two blocking bosses 21 by a predetermined distance. The outer peripheral wall of the blocking boss 21 and the opening and closing boss 22 is in sealing abutment with the inner wall of the sliding channel 101. The two position maintaining mechanisms 30 are respectively compressibly installed in the two installation spaces 102 in a compressed state, and the position maintaining mechanisms 30 have a restoring tendency when compressed. The two position maintaining mechanisms 30 respectively maintain the opposite end surfaces of the valve core 20, and each position maintaining mechanism 30 is spaced apart from the opposite blocking boss 21 by a predetermined distance.

[0029] The double-pipe explosion-proof valve has a normally open state and a half-open state, and the valve core 20 moves in the sliding channel 101 formed by the valve body 10 to switch the double-pipe explosion-proof valve between the normally open state and the half-open state.

[0030] When the dual-line explosion-proof valve is in the normally open state, the gaps between the two blocking bosses 21 and the opening and closing boss 22 are in communication with the input channel 104, and the gaps between the two blocking bosses 21 and the opening and closing boss 22 are in communication with the two output channels 103, so that the fluid stored by the supply device flows through the gaps between the two blocking bosses 21 and the opening and closing boss 22 to the two output channels 103, part of the fluid flows to the dispensing equipment through the pipelines connected to the two output channels 103, and the other part of the fluid flows into the gaps between the two blocking bosses 21 and the position maintaining mechanisms 30 adjacent to them through the two return channels 105 connected to the two output channels 103. In this way, the valve core 20 remains stationary under the elastic force of the two position maintaining mechanisms 30 and the pressure of the fluid flowing into the gaps between the two blocking bosses 21 and the position maintaining mechanisms 30 adjacent to them.

[0031] When the dual-line explosion-proof valve is in the semi-open state, the gaps between the two blocking bosses 21 and the opening and closing boss 22 are in communication with the input channel 104. The gap between one of the blocking bosses 21 and the opening and closing boss 22 is in communication with the corresponding output channel 103; the gap between the other blocking boss 21 and the opening and closing boss 22 is staggered with the corresponding output channel 103, so that the opening and closing boss 22 blocks the flow path of the input channel 104 through the gap between the blocking boss 21 and the opening and closing boss 22 to the corresponding output channel 103, that is, in the semi-open state, only one output channel 103 can output fluid to the dispensing equipment.

[0032] It can be understood that when any of the two pipelines connected to the two output channels 103 is broken, the dual-line explosion-proof valve switches from the normally open state to the semi-open state. Specifically, fluid leaks from the broken pipeline, and the pressure of the output channel 103 connected to the broken pipeline decreases, and at the same time, the pressure in the return channel 105 connected to the output channel 103 with decreased pressure also decreases, so that the valve core 20 is unbalanced in pressure at both ends, and the fluid in the gap between the blocking boss 21 adjacent to the high-pressure return channel 105 and the opposite position maintaining mechanism 30 pushes the valve core 20 to move a predetermined distance along the axial direction of the sliding channel 101 to the position of the low-pressure return channel 105, and the gap between the blocking boss 21 adjacent to the low-pressure return channel 105 and the opening and closing boss 22 is staggered with the low-pressure output channel 103, so that the opening and closing boss 22 blocks the low-pressure output channel 103 to prevent fluid from continuing to leak from the broken pipeline.

[0033] It is worth mentioning that the input channel 104 is divided into a total flow channel 1041 and two branch flow channels 1042 in communication with the total flow channel 1041. The two branch flow channels 1042 are respectively in at least partial correspondence with the gaps between the two blocking bosses 21 and the opening and closing boss 22 away from the port of the total flow channel 1041, so that the input channel 104 is in communication with the gaps between the two blocking bosses 21 and the opening and closing boss 22.

[0034] It can be understood that the valve body 10 has two blocking walls 11 on the inner wall forming the sliding channel 101, which are formed between the port where the output channel 103 is in communication with the sliding channel 101 and the port where the return channel 105 in communication with the output channel 103 is in communication with the sliding channel 101. The two blocking bosses 21 are respectively in abutment with the two blocking walls 11 to ensure that the fluid between the blocking boss 21 and the position maintaining mechanism 30 is all output from the output channel 103. When the double-pipe explosion-proof valve is in the normally open state, the opening and closing boss 22 is offset from the two blocking walls 11; when the double-pipe explosion-proof valve is in the half-open state, the opening and closing boss 22 is in sealing abutment with one of the blocking walls 11.

[0035] Preferably, the blocking boss 21 comprises a blocking part 211 and a flow guiding part 212 connected with each other, wherein the flow guiding part 212 is towards the opening and closing boss 22, and the blocking part 211 is towards the opposite position maintaining mechanism 30. The radial cross-sectional diameter of the flow guiding part 212 gradually increases in the direction from the end towards the opening and closing boss 22 to the blocking part 211. In this way, the fluid flows to the space between the flow guiding part 212 and the opening and closing boss 22 under the guidance of the outer wall of the flow guiding part 212 through the branch flow channel 1042.

[0036] It can also be understood that since the shape of the flow guiding part 212 is such that the radial cross-sectional diameter gradually increases in the direction from the end towards the opening and closing boss 22 to the blocking part 211, the material for manufacturing the valve core 20 can be reduced, and the space between the flow guiding part 212 and the opening and closing boss 22 is enlarged.

[0037] As a preference, the opening and closing boss 22 further forms at least one material reducing groove 2201, and the opening and closing boss 22 is divided into two parts by the material reducing groove 2201, which is used to reduce the material for manufacturing the valve core 20.

[0038] In an embodiment, in the normally open state, two ends of the valve core 20 are respectively detachably kept in abutment with two position maintaining mechanisms 30. In the semi-open state, after the blocking boss 21 close to the high-pressure return flow channel 105 and the opposite position maintaining mechanism 30 are separated by a predetermined distance along the axial direction of the sliding channel 101 under the fluid pushing force between the blocking boss 21 close to the high-pressure return flow channel 105 and the opposite position maintaining mechanism 30, the end surface of the valve core 20 close to the high-pressure return flow channel 105 is separated from the corresponding position maintaining mechanism 30. After maintenance by the staff, the valve core 20 overcomes the pressure of the fluid between the blocking boss 211 close to the originally low-pressure return flow channel 105 and the opposite position maintaining mechanism 30 and moves to the position of the originally high-pressure return flow channel 105 by a predetermined distance under the combined action of the elastic force of the position maintaining mechanism 30 pressed by the valve core 20 and the pressure of the fluid flowing between the blocking boss 211 close to the originally low-pressure return flow channel 105 and the opposite position maintaining mechanism 30, so as to reset, and then the pipeline explosion-proof valve device is switched from the semi-open state to the normally open state.

[0039] Specifically, each position maintaining mechanism 30 comprises an elastic member 31 which is elastically deformed and installed in the installation space 102. The elastic member 31 is opposite to the end surface of the valve core 20. As an example, the elastic member 31 is implemented as a spring.

[0040] In an embodiment, the position maintaining mechanism 30 further comprises a pressure applying member 32. The elastic member 31 is telescopically installed in the installation space 102 in a compressed state, the pressure applying member 32 is located between the elastic member 31 and the valve core 20, and the pressure applying member 32 is in abutment with the elastic member 31. The end surface of the pressure applying member 32 facing away from the elastic member 31 faces the valve core 20. The valve core 20 moves by pushing the pressure applying member 32 to further compress the elastic member 31. It is worth mentioning that the end surface area of the pressure applying member 32 facing the elastic member 31 is larger than the radial cross-sectional dimension of the elastic member 31, so that the pressure applying member 32 can apply pressure to the entire end surface of the elastic member 31, ensuring that the elastic member 31 is uniformly stressed.

[0041] As a preferred, the valve core 20 forms a guide structure 23 on the end surface, and the pressure applying member 32 forms a fitting structure 321, and the size and shape of the guide structure 23 and the fitting structure 321 are matched. When the double-pipeline explosion-proof valve is in the normally open state, the guide structure 23 is inserted with the fitting structure 321; when the double-pipeline explosion-proof valve is switched from the normally open state to the semi-open state, the guide structure 23 moves away from the fitting structure 321.

[0042] In an example, either the guide structure 23 or the assembly structure 321 is implemented as a hole or a slot, and the other is implemented as a limiting post.

[0043] As a preferred embodiment, the guide structure 23 is implemented as a limiting post, and the assembly structure 321 is implemented as a through hole. When the dual-line explosion-proof valve is in the normally open state, the limiting post is inserted into the through hole and penetrates into the elastic member 31, so as to prevent the elastic member 31 from being displaced when the valve core 20 compresses the elastic member 31 by the pressure applying member 32, and to ensure that the elastic member 31 can be stably compressed.

[0044] Preferably, the valve body 10 further forms a first limiting step 12, which is located on the movement path of the pressure applying member 32 being pushed back by the elastic member 31. When the dual-line explosion-proof valve is in the normally open state, the elastic member 31 pushes the pressure applying member 32 to abut against the first limiting step 12, so that the elastic member 31 is limited by the pressure applying member 32 and the first limiting step 12 to define the position of the valve core 20 being reset.

[0045] Also as a preferred embodiment, the valve body 10 further forms a second limiting step 13, which is located on the movement path of the pressure applying member 32 compressing the elastic member 31. When the dual-line explosion-proof valve is in the half-open state, the valve core 20 presses a position maintaining mechanism 30, and the pressure applying member 32 included in the position maintaining mechanism 30 abuts against the corresponding second limiting step 13 to limit the maximum degree of the pressure applying member 32 pressing the elastic member 31 and the distance of the valve core 20 moving along the axial direction of itself when the dual-line explosion-proof valve is switched from the normally open state to the half-open state.

[0046] Those skilled in the art should understand that the embodiments of the present application described above and shown in the drawings are only examples and do not limit the present application. The advantages of the present application have been fully and effectively achieved. The functional and structural principles of the present application have been shown and described in the embodiments, and the embodiments of the present application can be modified or changed in any way without departing from the principles.

Claims

1. A two line rupture disc valve characterized by, The double-pipe explosion-proof valve comprises: a valve body, which forms a sliding channel, two installation spaces, two output channels, an input channel and two return channels, the two installation spaces are respectively communicated with two ports of the sliding channel, the input channel is communicated with the two output channels through the sliding channel, and the two return channels are respectively communicated with the two output channels and the sliding channel; a valve core, which is movably installed in the sliding channel along the axial direction of the sliding channel, part of the valve core extends outward along the radial direction of the valve core to form two blocking bosses and an opening and closing boss between the two blocking bosses, the opening and closing boss is spaced apart from the two blocking bosses by a predetermined distance, and the outer wall of the blocking boss and the opening and closing boss is sealingly abutted against the inner wall of the sliding channel; two position maintaining mechanisms, each of which is compressively installed in the two installation spaces in a compressed state, and each of which has a restoring tendency when compressed, and each of which is opposite to the two end faces of the valve core, and each of which is spaced apart from the opposite blocking boss by a predetermined distance; the double-pipe explosion-proof valve has a normally open state and a half-open state: when the double-pipe explosion-proof valve is in the normally open state, the gaps between the two blocking bosses and the opening and closing boss are respectively communicated with the input channel, and the gaps between the two blocking bosses and the opening and closing boss are respectively communicated with the two output channels, the fluid flows through the input channel to the two output channels through the gaps between the two blocking bosses and the opening and closing boss respectively, part of the fluid flows out through the pipelines connected with the two output channels, and the other part of the fluid flows into the gaps between the two blocking bosses and the position maintaining mechanisms adjacent to the two blocking bosses respectively through the two return channels communicated with the two output channels; when the double-pipe explosion-proof valve is in the half-open state, the gaps between the two blocking bosses and the opening and closing boss are respectively communicated with the input channel, the gap between one of the blocking bosses and the opening and closing boss is communicated with the corresponding output channel, and the gap between the other blocking boss and the opening and closing boss is staggered with the corresponding output channel.

2. The dual line explosion relief valve of claim 1, wherein, The input channel is divided into a total flow passage and two branch flow passages communicated with the total flow passage, and the ports of the two branch flow passages away from the total flow passage at least partially correspond to the gaps between the two blocking bosses and the opening and closing boss respectively.

3. The dual line explosion relief valve of claim 2, wherein, The valve body has two blocking walls on the inner wall forming the sliding channel, the blocking walls are extended between the ports where the output channels are communicated with the sliding channel and the ports where the return channels communicated with the output channels are communicated with the sliding channel, and the two blocking bosses are respectively abutted against the two blocking walls; when the double-pipe explosion-proof valve is in the normally open state, the opening and closing boss is staggered with the two blocking walls; when the double-pipe explosion-proof valve is in the half-open state, the opening and closing boss is sealingly abutted against one of the blocking walls.

4. The dual conduit explosion relief valve of claim 3, wherein, The blocking boss comprises a blocking part and a flow guiding part, the blocking part and the flow guiding part are connected, wherein the flow guiding part faces the opening and closing boss, the blocking part faces the opposite position maintaining mechanism, and the radial cross-sectional diameter of the flow guiding part gradually increases along the direction from the end facing the opening and closing boss to the blocking part.

5. The dual conduit explosion relief valve of claim 4, wherein, The opening and closing boss further forms at least one material reducing groove, and the opening and closing boss is divided into two parts through the material reducing groove.

6. A dual conduit explosion relief valve according to claim 4 or 5, wherein, In the normally open state, the two ends of the valve core are respectively and detachably kept in abutment with the two position maintaining mechanisms; in the half open state, one end face of the valve core is separated from the corresponding position maintaining mechanism.

7. The dual conduit explosion relief valve of claim 6, wherein, Each position maintaining mechanism comprises an elastic member, the elastic member is elastically deformedly installed in the installation space, and the elastic member keeps opposite to the end face of the valve core.

8. The dual conduit explosion relief valve of claim 7, wherein, The position maintaining mechanism further comprises a pressing member, the elastic member is telescopically installed in the installation space in a compressed state, the pressing member is located between the elastic member and the valve core, and the pressing member keeps in abutment with the elastic member, the end face of the pressing member facing away from the elastic member faces the valve core, and the end face of the pressing member facing toward the elastic member has an area greater than the radial cross-sectional dimension of the elastic member.

9. The dual conduit explosion relief valve of claim 8, wherein, The valve core forms a guide structure on the end face, the pressing member forms an assembly structure, the guide structure and the assembly structure are matched in size and shape, the guide structure and the assembly structure are inserted when the double pipeline explosion-proof valve is in the normally open state, and one guide structure moves away from the assembly structure when the double pipeline explosion-proof valve switches from the normally open state to the half open state.

10. The dual conduit explosion relief valve of claim 9, wherein, The valve body forms a first limiting step and a second limiting step, the first limiting step is located on the movement path of the pressing member being pushed by the elastic member to reset, the elastic member pushes the pressing member to abut against the first limiting step when the double pipeline explosion-proof valve is in the normally open state, the second limiting step is located on the movement path of the pressing member compressing the elastic member, and the valve core extrudes one position maintaining mechanism and the pressing member included in the position maintaining mechanism abuts against the corresponding second limiting step when the double pipeline explosion-proof valve is in the half open state.

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