Breaking valve

Abstract

The breaking valve comprises a valve body, a cavity with a rightward opening is formed in the valve body, a breaking shaft capable of moving left and right is inserted in the cavity, a valve element is arranged at the left end of the breaking shaft in a sleeved mode, and a transmission piece used for driving the valve element to move synchronously is arranged on the breaking shaft. A limiting part for limiting the valve element to move rightwards is further arranged in the cavity. A first flow channel is further arranged in the valve body, and an inlet is formed in one end of the first flow channel. A second runner is arranged on the snapping shaft, and an outlet is formed in one end part of the second runner; when the breaking valve is in a circulating state, the inlet, the first flow channel, the second flow channel and the outlet are communicated in sequence; and when the breaking valve is in a cut-off state, the peripheral surface of the valve core blocks the first flow channel. And fatigue and hydrogen embrittlement harms suffered by the break-away valve are effectively reduced, even if the break-away valve is stored or used for a long time, the flow channel can be completely closed, and therefore it is guaranteed that the break-away valve is reliable, safe, stable and long-acting.

Description

Technical Field

[0001] The utility model relates to a breakaway valve, belonging to the technical field of valves. Background Art

[0002] A breakaway valve is a safety device installed at the connection of a pipeline. Its main purpose is to cut off the fluid in the pipeline when abnormal tension occurs, so as to prevent fluid leakage and ensure the safety of personnel and equipment. A breakaway valve usually consists of a detachable connector. When an abnormal situation occurs, the connector will be "broken" to close the valve, thereby achieving the purpose of cutting off the fluid pipeline.

[0003] Among them, the hydrogenation machine breakaway valve is a mandatory national standard for hydrogenation machines, which is an automatic disconnection protection valve to prevent tensile stress for coupling the output interface of the hydrogenation machine with the input interface of the hydrogenation gun pipeline. Its main function is to prevent misoperation or improper operation when the hydrogenation gun is pulled out after the hydrogenation machine is filled, and the tensile stress generated when the hydrogenation vehicle starts to drive away will pull down the hydrogenation machine, causing the high-pressure pipeline interface of the hydrogenation machine to explode, resulting in the leakage and spread of flammable and explosive high-pressure hydrogen and a major explosion hazard. It can be seen that the hydrogenation machine breakaway protection valve is extremely important and indispensable, and it is standard for each hydrogenation gun to be used in a standardized manner.

[0004] At present, the domestic configuration and application of hydrogenation machine breakaway valves are still mainly imported from Europe and the United States. The market price is high and domestic products are scarce. Even if they are rare in the market, they are mostly joint venture products. The product technology route is still controlled by foreign patents, with high costs, high prices, and low cost performance. It is not easy to promote and popularize high cost performance in China. Therefore, the independent research and development of domestically produced high cost performance hydrogenation machine breakaway valves has become a sufficient and necessary requirement for the domestic promotion and popularization of hydrogenation energy station construction and the implementation of hydrogenation machine standard application. Utility Model Content

[0005] The utility model aims to provide a new breakaway valve in view of the above-mentioned problems, which adopts a new technical route, has high cost performance and reliable structure.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A breakaway valve comprises a valve body, wherein a chamber opening to the right is provided in the valve body, a breakaway shaft movable leftward and rightward is inserted in the chamber, a valve core is sleeved on the left end of the breakaway shaft, a transmission member for driving the valve core to move synchronously is provided on the breakaway shaft, and a limiter for limiting the rightward movement of the valve core is also provided in the chamber;

[0008] Optionally, a first flow channel is further provided in the valve body, and an inlet is provided at one end of the first flow channel; a second flow channel is provided on the breakaway shaft, and an outlet is provided at one end of the second flow channel; when the breakaway valve is in a flowing state, the inlet, the first flow channel, the second flow channel and the outlet are connected in sequence; when the breakaway valve is in a cut-off state, the outer periphery of the valve core blocks the first flow channel.

[0009] Optionally, a balancing flow channel is further provided on the valve body, and the balancing flow channel is communicated with the chamber.

[0010] Optionally, a detachable connecting joint is further provided between the break shaft and the valve body, the connecting joint is sleeved outside the break shaft and the valve core and inserted in the chamber, and the limiting portion is provided in the connecting joint; a connecting channel for connecting the first channel and the second channel is opened on the connecting joint; when the break valve is in a flowing state, the inlet, the first channel, the connecting channel, the second channel and the outlet are connected in sequence; when the break valve is in a cut-off state, the outer periphery of the valve core blocks the connecting channel.

[0011] Optionally, a limit step hole is provided at the left end of the associated joint, the large diameter section of the limit step hole is provided on the left side of the small diameter section, the valve core is provided in the limit step hole, and a limit ring is provided at the left end of the valve core, and the size of the limit ring is smaller than the large diameter section of the limit step hole and larger than the small diameter section of the limit step hole.

[0012] Optionally, the transmission member is a breaking pin inserted into the left end of the breaking shaft, and the breaking pin is arranged on the left side of the valve core.

[0013] Optionally, two first sealing grooves are arranged at intervals along the radial direction on the valve core, and first sealing rings are arranged in each of the first sealing grooves; when the breakaway valve is in the cut-off state, the two first sealing rings are respectively arranged on the left and right sides of the inner opening of the connecting flow channel;

[0014] A second sealing groove is provided on the left and right sides of the outer opening of the second flow channel respectively, and a second sealing ring is provided in each of the second sealing grooves;

[0015] The left and right sides of the outer opening of the connecting flow channel are respectively provided with third sealing grooves, and the third sealing rings are respectively provided in the third sealing grooves.

[0016] Optionally, the first flow channel and the connecting flow channel are two symmetrically arranged ones.

[0017] Optionally, the outlet is provided with a one-way valve, and the flow direction of the one-way valve is from left to right.

[0018] Optionally, the associated joint is provided with a compression spring arranged in the radial direction, and the inner end of the compression spring is provided with a slide groove ball; the breakaway shaft is provided with a ball locking groove; when the breakaway valve is in a flow state, the slide groove ball is located in the ball locking groove.

[0019] Optionally, the left end of the valve core is provided with a pressure relief balance hole extending radially; the inner hole of the valve core is provided with a guide groove extending axially; and the right end of the valve core is provided with a pressure equalizing guide hole opened at an inclined angle.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0021] 1. The breakaway valve provided by the utility model is particularly suitable for the equipment that needs to be protected from tensile stress in the coupling connection of the charging and filling output pipeline of ultra-high pressure flammable and explosive hydrogenation locomotives and the charging and filling output pipeline of compatible fluid pressure vehicles, and is used for breakaway application protection to suppress and avoid safety accidents caused by misoperation or the collapse of the filling equipment by uncertain sudden tensile stress.

[0022] 2. The breakaway valve provided by the utility model effectively reduces fatigue and hydrogen embrittlement of the breakaway valve, and can completely close the flow channel even during long-term storage or use, thereby ensuring the reliability, safety, stability and long-term effectiveness of the breakaway valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the breakaway valve when it is not broken.

[0024] Figure 2 It is a structural diagram of the valve body.

[0025] Figure 3 It is a structural diagram of the associated joint.

[0026] Figure 4 It is a structural diagram of the valve core.

[0027] Figure 5 It is a schematic diagram of the structure of the broken shaft.

[0028] Figure 6 It is a schematic diagram of the structure after being broken.

[0029] Markings in the figure: 1-valve body, 11-chamber, 12-first flow channel, 13-balancing flow channel, 14-inlet, 2-associated joint, 21-third sealing ring, 22-connecting flow channel, 23-compression spring, 24-slide groove ball, 25-locking ring, 26-limit locking screw, 3-valve core, 31-pressure relief balance hole, 32-guide groove, 33-pressure equalizing guide hole, 34-first sealing ring, 4-pull-off shaft, 41-pull-off pin, 42-second sealing ring, 43-second flow channel, 44-ball locking groove, 45-check valve. DETAILED DESCRIPTION

[0030] The utility model is described in detail below in conjunction with the accompanying drawings.

[0031] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0032] A breakaway valve, such as Figure 1-6 As shown, it comprises a valve body 1, wherein a chamber 11 opening to the right is provided in the valve body 1, a break shaft 4 movable leftward and rightward is inserted in the chamber 11, a valve core 3 is sleeved on the left end of the break shaft 4, a transmission member for driving the valve core 3 to move synchronously is provided on the break shaft 4, and a limit portion for limiting the rightward movement of the valve core 3 is also provided in the chamber 11;

[0033] A first flow channel 12 is also provided in the valve body 1, and an inlet 14 is provided at one end of the first flow channel 12; a second flow channel 43 is provided on the break shaft 4, and an outlet is provided at one end of the second flow channel 43; when the break valve is in a flow state, the inlet 14, the first flow channel 12, the second flow channel 43 and the outlet are connected in sequence; when the break valve is in a cut-off state, the outer periphery of the valve core 3 blocks the first flow channel 12.

[0034] In the traditional method, the compressed spring energy storage is used to release the elastic force to push the valve core 3 to close the fluid output confluence interface. The disadvantages of this compression spring energy storage reset closing method are: first, the spring is not easy to be made of hydrogen embrittlement resistant metal materials and has poor durability; second, even if it is made of traditional metal materials, it is limited by the design process structure of the breakaway valve and the constraints of the special finished product use conditions. That is, once the breakaway valve is assembled, the reset spring in its structure must be in a long-term compressed and ringed state from the beginning of inventory until the breakaway valve accident occurs. Therefore, the long-term compressed and ringed spring has physical fatigue, which leads to a decrease in the thrust trend of the elastic reset closing valve core 3. In addition, the probability of a breakaway accident is extremely small and it is unlikely to occur once in several years. In addition, under long-term working conditions where hydrogen embrittlement of extremely small hydrogen molecules at ultra-high pressure may cause damage, the spring material tends to deform and the elastic force weakens. As a result, once a tensile stress accident of the valve breaks occurs, the thrust of the deformed elasticity is weakened under the working conditions of the spring structure. The spring with weakened deformed elasticity cannot fully ensure the reset push valve core 3 to completely close the output airway confluence interface, which may lead to the leakage of high-pressure flammable and explosive fluid jets, causing a safety accident.

[0035] In this solution, by the rightward movement of the breaking shaft 4, the valve core 3 is driven to move to the right at the same time by the transmission part, and the movement of the valve core 3 is limited by the limit part, the valve core 3 is positioned, and the corresponding component at the inner end of the first flow channel 12 is switched from the breaking shaft 4 to the valve core 3. By utilizing the principle of kinetic energy work of the external tensile stress of the breaking shaft 4, it is reliably ensured that the valve core 3 used for the linkage locking airway is synchronously pulled out to the locking position of the output gas confluence interface, that is, the inner end of the first flow channel 12, so as to achieve the purpose of pulling the locking valve core 3 to the position equalizing pressure lock to close the output confluence interface without leakage. Among them, the valve body 1, the breaking shaft 4 and the valve core 3 are all made of compatible anti-hydrogen embrittlement protection metal. Among them, the first flow channel 12 first moves radially outward, then axially to the right, and finally radially inward, thereby connecting the inlet 14, and avoiding the chamber 11, providing space for the opening of the chamber 11. The second flow channel 43 first moves inward in the radial direction and then moves rightward in the axial direction, thereby matching with the first flow channel 12 and connecting with the outlet.

[0036] As another specific embodiment, a balancing channel 13 is further provided on the valve body 1, and the balancing channel 13 is connected to the chamber 11. The balancing channel 13 can be used to balance the air pressure in the chamber 11, so as to avoid the destruction of the stable working condition of the break valve and its valve core 3 due to transient impact and high-pressure fluid turbulence caused by the dynamic break shaft 4 movement, thereby improving the safety performance and operation efficiency of the equipment. In the existing scheme, the input airway and the atmospheric pressure balancing airway are in the same chamber and have to be forcibly isolated by an "O" ring. Even if such isolation is adopted, for ultra-high pressure and extremely small hydrogen molecules, ordinary stainless steel metals can penetrate into the metallographic structure and be destroyed by hydrogen embrittlement, not to mention the plastic isolation "O" ring. Otherwise, even if the traditional "O" ring sealing isolation of the main and auxiliary airways in the same chamber is forced to be adopted, its use is only temporary, resulting in high-pressure leakage, which directly destroys the reliable, safe, stable and long-term operation of the break valve. In this solution, the balancing channel 13 is not connected to the main channel (i.e., the inlet 14 to the outlet channel), but is staggered in a spatially non-planar manner, without interference, and no hydrogen flows through it, without the need for isolation, thereby ensuring that the hydrogenation machine's breakaway valve can operate stably and reliably for a long time.

[0037] As another specific embodiment, a detachable associated joint 2 is further provided between the break shaft 4 and the valve body 1. The associated joint 2 is sleeved outside the break shaft 4 and the valve core 3 and inserted into the chamber 11, and the limit portion is provided in the associated joint 2; a connecting flow channel 22 for connecting the first flow channel 12 and the second flow channel 43 is provided on the associated joint 2; when the break valve is in a flow state, the inlet 14, the first flow channel 12, the connecting flow channel 22, the second flow channel 43 and the outlet are connected in sequence; when the break valve is in a cut-off state, the outer circumference of the valve core 3 blocks the connecting flow channel 22. The limit portion and the valve body 1 can be detached by the associated joint 2. After the associated joint 2 is disassembled, the valve core 3 and the transmission member can be placed in the associated joint 2 from the left side outside the valve body 1, thereby facilitating the installation and reset of the break valve. Further, the associated joint 2 is fixed by a limit locking screw 26. When this method is not adopted, the limit portion can also be directly detachably connected to the valve body 1.

[0038] As another specific implementation, the left end of the associated joint 2 is provided with a limit step hole, the large diameter section of the limit step hole is provided on the left side of the small diameter section, the valve core 3 is provided in the limit step hole, and the left end of the valve core 3 is provided with a limit ring, the size of the limit ring is smaller than the large diameter section of the limit step hole and larger than the small diameter section of the limit step hole. The limit ring can enter the large diameter section but cannot enter the small diameter section, so the end face of the small diameter section is used to limit the limit ring. The structure is simple and easy to implement, and can achieve stable performance and reliable limit control.

[0039] As another specific embodiment, the transmission member is a breaking pin 41 inserted into the left end of the breaking shaft 4, and the breaking pin 41 is arranged on the left side of the valve core 3. When the standard stress extreme value is reached, the shear force between the breaking pin 41 and the valve core 3 causes the breaking pin 41 to break, thereby realizing the automatic separation of the locking valve core 3 and the breaking shaft 4.

[0040] As another specific embodiment, two first sealing grooves are radially spaced apart on the valve core 3, and first sealing rings 34 are provided in each of the first sealing grooves; when the break valve is in the cut-off state, the two first sealing rings 34 are respectively arranged on the left and right sides of the inner opening of the connecting flow channel 22; the principle of the "O" first sealing rings at both ends of the cylinder balancing the atmospheric pressure to stably lock the valve core 3 is adopted, and at the same time, the principle of the valve core 3 with the middle cylindrical surface sealed, isolated and latched to close the output airflow confluence interface by using the first sealing rings at both ends to stabilize the atmospheric pressure, so as to achieve the goal of synchronously pulling and sliding to lock the output airway confluence valve core 3 when the break shaft 4 is stressed, and automatically separating the break pin 41 of the valve core 3 within the standard stress value range to achieve the purpose of balancing the internal and external pressures and the first sealing rings at both ends thereof balancing the atmospheric pressure to stably seal the middle cylindrical fluid to isolate and latch to close the output airflow confluence interface, so as to ensure that there is no leakage when the break valve break shaft 4 is separated.

[0041] A second sealing groove is provided on the left and right sides of the outer opening of the second flow channel 43, and a second sealing ring 42 is provided in each of the second sealing grooves; the second sealing ring 42 that balances the atmospheric pressure at both ends of the cylinder on the breaking shaft 4 is used to balance the pressure and stabilize the breaking shaft 4, ensuring reliable and stable diversion output under turbulent and various impact-type flow conditions, and utilizing the valve core 3 guide shaft of the breaking shaft 4 and the synchronous locking valve core 3 linked with the breaking pin to synchronously displace the valve core 3 under the action of the external pulling standard stress to automatically separate the breaking pin 41, so that the "O"-shaped second sealing rings at both ends of the locking valve core 3 can balance the pressure and stably lock the locking valve core 3 to close the fluid output confluence, ensuring that the output is leak-free after the entire breaking shaft 4 is pulled out of the valve body 1.

[0042] The left and right sides of the outer opening of the connecting flow channel 22 are respectively provided with third sealing grooves, and the third sealing grooves are each provided with a third sealing ring 21. The "O"-shaped third sealing rings at both ends of the connecting flow channel 22 are used to seal the gap between the first flow channel 12 and the connecting flow channel 22 with uniform pressure and stability, ensuring that the entire breakaway valve output is leak-free.

[0043] As another specific embodiment, the first flow channel 12 and the connecting flow channel 22 are both symmetrically arranged. The requirement of input diversion can be achieved through the strip-shaped flow channel, and the independently arranged flow channel can prevent the intersection between the main flow channel and the balancing flow channel 13, resulting in leakage, so as to meet the reliable operation of stable balance and no leakage of atmospheric pressure under various working conditions. Symmetry can be achieved through two flow channels, ensuring the stability of the structure and the transportation process, and increasing the controllability of the transportation flow. In addition, in the actual setting, multiple first flow channels 12 can be evenly arranged along the circumference to achieve flow control. Among them, multiple first flow channels 12 need to avoid the balancing flow channel 13. Furthermore, the number of the connecting flow channels 22 matches the first flow channel.

[0044] As another specific embodiment, the outlet is provided with a one-way valve 45, and the flow direction of the one-way valve 45 is from left to right. Once the break shaft 4 separates from the valve body 1, the confluence output pressure is closed and there is no positive pressure output, so that the built-in one-way valve 45 of the break shaft 4 is subjected to the reverse pressure and simultaneously closes the confluence interface of the break shaft 4, that is, the purpose of bidirectional leakage-free when the break shaft 4 is completely separated from the coupling pipeline interface is achieved.

[0045] As another specific embodiment, the associated joint 2 is provided with a compression spring 23 arranged in a radial direction, and the inner end of the compression spring 23 is provided with a slide groove ball 24; the break shaft 4 is provided with a ball locking groove 44; when the break valve is in a flow state, the slide groove ball 24 is located in the ball locking groove 44. The slide groove ball 24 acting on the break shaft 4 is prestressed in the ball locking groove 44 by the compression spring 23, ensuring that the break shaft 4 is prevented from automatically falling off when the pipe is empty without loading fluid, or when it is pulled by the superposition of dead weight and external stress, and ensuring that the coupling pipeline interface is reliably broken and separated without leakage only when the tensile stress is equal to or greater than the standard. Further, the compression spring 23 is positioned by a locking ring 25.

[0046] As another specific embodiment, the left end of the valve core 3 is provided with a pressure relief balance hole 31 penetrating in the radial direction; the inner hole of the valve core 3 is provided with a guide groove 32 extending in the axial direction; and the right end of the valve core 3 is provided with an inclined pressure equalization guide hole 33. It is ensured that the standard stress of the breaking pin 41 is automatically and reliably sheared and separated.

[0047] The working process of a breakaway valve provided in this embodiment is as follows:

[0048] The hydrogenator is started normally to add gas, and the fluid enters from the inlet 14, and flows into the first flow channel 12, the connecting flow channel 22, and the second flow channel 43 in two independent gas channels, and enters the outlet for use. Once the break shaft 4 of the break valve is pulled by the external stress to reach the standard value, the break shaft 4 is first displaced and separated, and at the same time, the guide pulls the sliding locking valve core 3 to be synchronously moved out and set to the locking limit position, and the break shaft 4 and the locking valve core 3 are automatically separated by the break pin 41. The equalizing seal rings at both ends of the locking valve core 3 are under the stable equalizing isolation effect, and the locking valve core 3 is set to work stably in a reliable working condition. The cylindrical surface between the two isolation equalizing seal rings of the locking valve core 3 completely blocks the fluid confluence interface without output and leakage; at the same time, the break shaft 4 of the break valve is automatically disconnected due to the built-in one-way valve 45. Once pulled, it is automatically disconnected. The built-in one-way valve 45 prevents the reverse leakage of the output fluid medium under the action of reverse pressure. After the break shaft 4 is automatically separated, the built-in one-way valve 45 is reversely cut off without leakage. Thereby, when the breakaway valve is pulled by the standard stress, the hydrogen filling machine of the filling equipment is protected from being pulled down, and at the same time, the purpose of safety protection without external leakage is achieved, and the protection function of the breakaway valve is fully and reliably realized.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The present invention is extended to any new features or any new combination disclosed in this specification, and any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

[0050] In the description of the embodiments of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0051] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

Claims

1. A breakaway valve, characterized in that: The valve body (1) comprises a chamber (11) which opens to the right and is provided in the valve body (1). A break shaft (4) which can move leftward and rightward is inserted in the chamber (11). A valve core (3) is sleeved on the left end of the break shaft (4). A transmission member for driving the valve core (3) to move synchronously is provided on the break shaft (4). A limit portion for limiting the rightward movement of the valve core (3) is also provided in the chamber (11). A first flow channel (12) is also provided in the valve body (1), and an inlet (14) is provided at one end of the first flow channel (12); a second flow channel (43) is provided on the breakaway shaft (4), and an outlet is provided at one end of the second flow channel (43); when the breakaway valve is in a flow state, the inlet (14), the first flow channel (12), the second flow channel (43) and the outlet are connected in sequence; when the breakaway valve is in a cut-off state, the outer periphery of the valve core (3) blocks the first flow channel (12).

2. The breakaway valve according to claim 1, characterized in that: The valve body (1) is also provided with a balancing flow channel (13), and the balancing flow channel (13) is in communication with the chamber (11).

3. The breakaway valve according to claim 1, characterized in that: A detachable connecting joint (2) is also provided between the breakaway shaft (4) and the valve body (1), the connecting joint (2) is sleeved outside the breakaway shaft (4) and the valve core (3) and inserted into the chamber (11), and the limiting portion is provided in the connecting joint (2); a connecting flow channel (22) for connecting the first flow channel (12) and the second flow channel (43) is provided on the connecting joint (2); when the breakaway valve is in a flow state, the inlet (14), the first flow channel (12), the connecting flow channel (22), the second flow channel (43) and the outlet are connected in sequence; when the breakaway valve is in a cutoff state, the outer circumference of the valve core (3) blocks the connecting flow channel (22).

4. The breakaway valve according to claim 3, characterized in that: A limit step hole is provided at the left end of the associated joint (2), the large diameter section of the limit step hole is provided on the left side of the small diameter section, the valve core (3) is provided in the limit step hole, and a limit ring is provided at the left end of the valve core (3), the size of the limit ring is smaller than the large diameter section of the limit step hole and larger than the small diameter section of the limit step hole.

5. The breakaway valve according to claim 3, characterized in that: The transmission member is a breaking pin (41) inserted into the left end of the breaking shaft (4), and the breaking pin (41) is arranged on the left side of the valve core (3).

6. The breakaway valve according to claim 3, characterized in that: Two first sealing grooves are arranged at intervals along the radial direction on the valve core (3), and first sealing rings (34) are arranged in each of the first sealing grooves; when the breakaway valve is in the cut-off state, the two first sealing rings (34) are respectively arranged on the left and right sides of the inner opening of the connecting flow channel (22); Second sealing grooves are respectively provided on the left and right sides of the outer opening of the second flow channel (43), and second sealing rings (42) are provided in the second sealing grooves; Third sealing grooves are respectively provided on the left and right sides of the outer opening of the connecting flow channel (22), and third sealing rings (21) are provided in the third sealing grooves.

7. The breakaway valve according to claim 3, characterized in that: The first flow channel (12) and the connecting flow channel (22) are both two symmetrically arranged ones.

8. The breakaway valve according to claim 1 or 3, characterized in that: The outlet is provided with a one-way valve (45), and the flow direction of the one-way valve (45) is from left to right.

9. The breakaway valve according to claim 3, characterized in that: The associated joint (2) is provided with a compression spring (23) arranged in a radial direction, and the inner end of the compression spring (23) is provided with a slide groove ball (24); the breakaway shaft (4) is provided with a ball locking groove (44); when the breakaway valve is in a flow state, the slide groove ball (24) is located in the ball locking groove (44).

10. The breakaway valve according to claim 1, characterized in that: The left end of the valve core (3) is provided with a pressure relief balance hole (31) penetrating in the radial direction; the inner hole of the valve core (3) is provided with a guide groove (32) extending in the axial direction; and the right end of the valve core (3) is provided with a pressure equalizing guide hole (33) opened obliquely.

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