A natural gas fire and explosion suppression valve device

Abstract

The application relates to the technical field of valves and discloses a natural gas fireproof explosion suppression valve device, which comprises a transmission pipeline, a resettable explosion suppression cavity assembly and an emergency cut-off valve which are sequentially and communicatively arranged along the medium flow direction, a heat-sensitive sensor and a pressure sensor which are both assembled at the air inlet end of the transmission pipeline, and a controller which is signal-connected with the heat-sensitive sensor and the pressure sensor and is used for controlling the on-off of the emergency cut-off valve; when the monitoring signal of the heat-sensitive sensor exceeds a preset threshold value, the valve core of the emergency cut-off valve is closed, and the fire blocking core is moved to adhere to the valve core sealing surface of the emergency cut-off valve. The application can realize synchronous linkage protection: when the temperature is abnormally high, the emergency cut-off valve and the fire blocking core are synchronously actuated, the hysteresis of single cut-off protection is avoided, and the timeliness of emergency response is improved. Double sealing and blocking: the fire blocking core adheres to the closed valve core sealing surface, double medium blockage of the "cut-off valve core + fire blocking core" is formed, and the reliability of fireproof sealing is strengthened.

Description

Technical Field

[0001] This invention relates to the field of valve technology, specifically to a natural gas fire prevention and explosion suppression valve device. Background Technology

[0002] The prior art relates to an explosion-proof natural gas valve, application number CN202123301129.0, which includes a housing, a valve body fixed inside the housing, an inlet section on one side of the valve body, an outlet section on the opposite side, and an intermediate transition section connecting the inlet and outlet sections in the middle of the valve body. A mechanical valve is installed in the inlet section of the valve body, and an electric valve is installed in the intermediate transition section. A gas leak sensor is installed inside the housing and electrically connected to the electric valve. A section of coil is connected to the outlet of the outlet section, and the coil is also installed inside the housing. The tail end of the coil is then connected to the gas load. This application can effectively solve the safety control problem of valves in the event of gas leakage, especially in the case of combustion, and improve the safety of gas operation.

[0003] However, existing technologies, especially this particular solution, still have the following problems:

[0004] Limited risk monitoring dimensions and delayed early warning: Relying solely on gas leak sensors for trigger control does not cover monitoring of risk sources in natural gas pipelines such as "overheating (precursor to fire)" and "overpressure (precursor to explosion)," making it impossible to provide early warning of explosion and fire risks. Actions can only be triggered after a leak occurs, making it difficult to prevent risks at the source.

[0005] The protective structure is simple and unreliable: it only uses electric valves to cut off the medium and lacks additional sealing and blocking components. If the valve core seal of the electric valve fails, it cannot form secondary protection and cannot effectively block the spread of flames or the leakage of the medium. The fire prevention and explosion suppression protection is unreliable. Summary of the Invention

[0006] The purpose of this invention is to provide a technical solution that, by detecting the valve status, provides dual protection against explosion and fire, and by blocking the valve core and flame arrestor core with dual media, thereby solving the problems in the prior art mentioned in the background.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A natural gas fire prevention and explosion suppression valve device, comprising:

[0009] The transmission pipeline is sequentially connected with a resettable explosion suppression chamber assembly and an emergency shut-off valve along the direction of medium flow. The resettable explosion suppression chamber assembly and the emergency shut-off valve are connected and installed through a flange connection pipe. A movable flame arrestor core is installed inside the cavity of the flange connection pipe. The flame arrestor core can move between the initial position and the valve core sealing surface of the emergency shut-off valve.

[0010] Both the thermal sensor and the pressure sensor are mounted at the air inlet end of the transmission pipeline. Both the thermal sensor and the pressure sensor are connected to the controller signal. At the same time, the controller is used to control the opening and closing of the emergency shut-off valve. When the monitoring signal of the thermal sensor exceeds the preset threshold, the valve core of the emergency shut-off valve closes and the flame arrestor moves to fit against the valve core sealing surface of the emergency shut-off valve.

[0011] Preferably, after receiving the over-temperature signal from the thermal sensor, the controller synchronously sends a forward rotation signal to the drive motor, which in turn drives the flame arrestor core to move toward the valve core sealing surface of the emergency shut-off valve. Once the flame arrestor core is in contact with the valve core sealing surface, the drive motor automatically cuts off the power and keeps the flame arrestor core in its current position.

[0012] Preferably, when the flame arrestor core moves to fit against the valve core sealing surface of the emergency shut-off valve, the valve core of the emergency shut-off valve is already in a fully closed state, and the moving path of the flame arrestor core does not interfere with the rotation path of the valve core of the emergency shut-off valve.

[0013] Preferably, the flange connecting pipe is provided with a sliding rod for sliding installation of the flame arrester core, and the flange connecting pipe is provided with a threaded rod for driving the flame arrester core to move. The flame arrester core is provided with a sliding hole corresponding to the sliding rod and a threaded hole corresponding to the threaded rod.

[0014] Preferably, the flange connecting pipe is provided with a flange groove, the drive motor is installed on the outside of the flange connecting pipe, and the output shaft of the drive motor extends into the inside of the flange connecting pipe through the flange groove seal. The output shaft of the drive motor drives the threaded rod to rotate through the drive gear, thereby realizing the movement drive of the flame arrestor core.

[0015] Preferably, the inlet end of the transmission pipeline is also connected to a gas injection port, and an electrically controlled valve is configured at the gas injection port; when the thermal sensor or pressure sensor detects an abnormal signal, the controller synchronously controls the electrically controlled valve to open, and injects rare explosion-suppressing gas into the transmission pipeline through the gas injection port.

[0016] Preferably, the thermal sensor and the pressure sensor are connected to the controller via a signal transmission pipeline, and the controller controls the electrically controlled valve at the gas injection port through a branch of the signal transmission pipeline.

[0017] Preferably, the resettable explosion suppression chamber assembly includes a detachable outer shell, a reset spring, and an adjusting piston; the adjusting piston is movably and sealed within the cavity of the detachable outer shell, one end of the reset spring abuts against the inner wall of the detachable outer shell, and the other end abuts against the adjusting piston; when the pressure in the transmission pipeline exceeds a preset range, the medium pressure pushes the adjusting piston to compress the reset spring, thereby expanding the effective volume of the resettable explosion suppression chamber assembly to buffer the pipeline pressure.

[0018] Preferably, the outer wall of the adjusting piston is provided with a sealing ring to achieve a sliding seal with the inner wall of the cavity of the detachable housing; the preload of the return spring can be adjusted by the adjusting bolt on the detachable housing to adapt to natural gas pipelines with different pressure thresholds.

[0019] Preferably, both the inlet and outlet ends of the transmission pipeline are equipped with shut-off valves, which are used to control the connection and disconnection between the transmission pipeline and the external natural gas pipeline.

[0020] Technical effects and advantages of the present invention: The natural gas fire prevention and explosion suppression valve device proposed in this invention has the following advantages compared with the prior art:

[0021] This invention detects the operating status of the valve. Under normal conditions: the medium in the transmission pipeline flows smoothly through the resettable explosion suppression chamber assembly, flange connection pipe, and emergency shut-off valve sequentially; the flame arrestor core is in its initial position within the flange connection pipe, and the thermal sensor and pressure sensor continuously monitor the inlet status. Abnormal triggering: when the signal monitored by the thermal sensor exceeds a preset threshold, the signal is transmitted to the controller. The controller simultaneously controls the emergency shut-off valve core to close and drives the flame arrestor core to move to the valve core sealing surface of the emergency shut-off valve.

[0022] Synchronous linkage protection: In the event of an over-temperature anomaly, the emergency shut-off valve and the flame arrester activate simultaneously, avoiding the lag of single shut-off protection and improving the timeliness of emergency response. Double sealing and isolation: The flame arrester adheres to the sealing surface of the closed valve core, forming a double media sealing of "shut-off valve core + flame arrester core," enhancing the reliability of the fireproof seal. Pre-emptive anomaly monitoring: Sensors mounted at the air inlet can detect temperature anomalies at the pipeline inlet earlier, allowing for more sufficient response time for protective actions. Attached Figure Description

[0023] Figure 1 This is one of the structural schematic diagrams of the natural gas fire prevention and explosion suppression valve device of the present invention;

[0024] Figure 2 This is the second schematic diagram of the structure of the natural gas fire prevention and explosion suppression valve device of the present invention;

[0025] Figure 3 This is the third schematic diagram of the structure of the natural gas fire prevention and explosion suppression valve device of the present invention;

[0026] Figure 4 This is a partial structural schematic diagram of the natural gas fire prevention and explosion suppression valve device of the present invention;

[0027] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A;

[0028] Figure 6 This is a schematic diagram of the fireproof core in an embodiment of the present invention.

[0029] In the picture:

[0030] 11. Transmission pipeline; 12. Resettable explosion suppression chamber assembly; 13. Removable outer casing; 14. Emergency shut-off valve; 15. Thermal sensor; 16. Signal transmission pipeline; 17. Gas injection port; 18. Pressure sensor; 19. Controller; 110. Shut-off valve; 111. Return spring; 112. Adjusting piston;

[0031] 21. Flange connecting pipe; 22. Threaded rod; 23. Flame arrestor core; 24. Drive gear; 25. Sliding rod; 26. Drive motor; 27. Flange groove; 28. Threaded hole; 29. ​​Sliding hole. Detailed Implementation

[0032] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0033] The invention provides, for example Figures 1 to 6 As shown, a natural gas fire prevention and explosion suppression valve device includes:

[0034] The transmission pipeline 11 is sequentially connected to a resettable explosion suppression chamber assembly 12 and an emergency shut-off valve 14 along the medium flow direction. The resettable explosion suppression chamber assembly 12 and the emergency shut-off valve 14 are connected and installed through a flange connecting pipe 21. A movable flame arrestor core 23 is provided inside the cavity of the flange connecting pipe 21. The flame arrestor core 23 can move between the initial position and the valve core sealing surface of the emergency shut-off valve 14.

[0035] Thermistor 15 and pressure sensor 18 are both mounted at the air inlet end of transmission pipe 11. Thermistor 15 and pressure sensor 18 are both connected to controller 19. Controller 19 is used to control the opening and closing of emergency shut-off valve 14. When the monitoring signal of thermistor 15 exceeds the preset threshold, the valve core of emergency shut-off valve 14 closes and the flame arrestor 23 moves to fit against the valve core sealing surface of emergency shut-off valve 14.

[0036] Working Principle: By detecting the operating status of the valves, under normal conditions: the medium in the transmission pipeline 11 flows smoothly along the flow direction through the resettable explosion suppression chamber assembly 12, the flange connection pipe 21, and the emergency shut-off valve 14; the flame arrestor core 23 is in its initial position within the flange connection pipe 21, and the thermal sensor 15 and pressure sensor 18 continuously monitor the status of the air inlet. Abnormal Trigger: When the signal monitored by the thermal sensor 15 exceeds the preset threshold, the signal is transmitted to the controller 19. The controller 19 synchronously controls the valve core of the emergency shut-off valve 14 to close, and simultaneously drives the flame arrestor core 23 to move to fit the valve core sealing surface of the emergency shut-off valve 14.

[0037] Synchronous linkage protection: In the event of an over-temperature anomaly, the emergency shut-off valve 14 and the flame arrestor core 23 operate synchronously, avoiding the lag of single shut-off protection and improving the timeliness of emergency response. Double sealing isolation: The flame arrestor core 23 fits against the sealed surface of the closed valve core, forming a double medium sealing of "shut-off valve core + flame arrestor core 23," enhancing the reliability of the fireproof seal. Pre-emptive anomaly monitoring: The sensor is mounted at the air inlet, allowing for earlier detection of temperature anomalies at the pipeline inlet, providing more sufficient response time for protective actions.

[0038] To ensure that the flame arrestor core 23 can move to the valve core sealing surface of the emergency shut-off valve 14 in a timely and accurate manner after the over-temperature signal is triggered, and to avoid the failure of the fireproof seal due to the delayed action or positioning deviation of the flame arrestor core 23, this embodiment further limits the control logic of the controller 19 on the drive motor 26 to achieve synchronous driving and precise positioning of the flame arrestor core 23.

[0039] After receiving the over-temperature signal from the thermal sensor 15, the controller 19 synchronously sends a forward rotation signal to the drive motor 26, which drives the flame arrestor core 23 to move toward the valve core sealing surface of the emergency shut-off valve 14. When the flame arrestor core 23 is in contact with the valve core sealing surface, the drive motor 26 automatically cuts off the power and keeps the flame arrestor core 23 in its current position.

[0040] It should be noted that since both the flame arrestor core 23 and the valve core of the emergency shut-off valve 14 need to complete their actions in the flange connection pipe 21 area, if there is interference between their action paths, it is easy to cause problems such as component jamming and damage to the sealing surface. Therefore, this embodiment limits the action sequence and path of the flame arrestor core 23 and the valve core of the emergency shut-off valve 14 to ensure the independence of their actions and the reliability of their sealing.

[0041] When the flame arrestor core 23 moves to fit against the valve core sealing surface of the emergency shut-off valve 14, the valve core of the emergency shut-off valve 14 is already in a fully closed state, and the moving path of the flame arrestor core 23 does not interfere with the rotation path of the valve core of the emergency shut-off valve 14.

[0042] like Figure 4 and Figure 5As shown, the specific structure of the flange connecting pipe 21 and the specific driving method of the drive motor 26 to the flame arrestor core 23 are described.

[0043] The flange connecting pipe 21 is internally provided with a sliding rod 25 for sliding installation of the flame arrestor core 23, and a threaded rod 22 for driving the flame arrestor core 23 to move. The flame arrestor core 23 is provided with a sliding hole 29 corresponding to the sliding rod 25 and a threaded hole 28 corresponding to the threaded rod 22. Specifically, the flange connecting pipe 21 is provided with a flange groove 27, and a drive motor 26 is installed on the outside of the flange connecting pipe 21. At the same time, the output shaft of the drive motor 26 extends into the flange connecting pipe 21 through the flange groove 27. The output shaft of the drive motor 26 drives the threaded rod 22 to rotate through a drive gear 24, thereby realizing the movement drive of the flame arrestor core 23.

[0044] like Figure 1 and Figure 3 As shown, relying solely on physical protection such as cut-off and flame arrest may not be enough to quickly suppress the risk of explosion under extreme conditions. Therefore, this embodiment adds an injection structure for rare explosion-suppressing gas, which further enhances the safety protection capability of the device through a synergistic approach of "physical sealing plus chemical explosion suppression".

[0045] The inlet of the transmission pipeline 11 is also connected to a gas injection port 17, and an electronically controlled valve is installed at the gas injection port 17. When the thermal sensor 15 or the pressure sensor 18 detects an abnormal signal, the controller 19 synchronously controls the electronically controlled valve to open and inject rare explosion-suppressing gas into the transmission pipeline 11 through the gas injection port 17.

[0046] like Figure 3 As shown, in order to simplify the wiring structure of signal transmission and ensure that the monitoring signals of thermal and pressure sensors and the control signals of the gas injection port 17 solenoid valve can be transmitted synchronously and stably, and to avoid the mess and signal interference caused by independent arrangement of multiple lines, this embodiment adopts the branch control method of signal transmission pipeline 16.

[0047] The thermal sensor 15 and the pressure sensor 18 are connected to the controller 19 via the signal transmission line 16. The controller 19 controls the electrically controlled valve at the gas injection port 17 through a branch of the signal transmission line 16.

[0048] like Figure 4 As shown, when a sudden pressure change occurs in a natural gas pipeline, a simple shut-off action is insufficient to quickly buffer the pressure and may easily lead to pipeline overpressure rupture. Therefore, this embodiment is equipped with a resettable explosion suppression chamber assembly 12, which achieves pressure buffering and depressurization of the pipeline through dynamic volume adjustment.

[0049] The resettable explosion suppression chamber assembly 12 includes a detachable outer shell 13, a reset spring 111, and an adjusting piston 112. The adjusting piston 112 is movably and sealed within the cavity of the detachable outer shell 13. One end of the reset spring 111 abuts against the inner wall of the detachable outer shell 13, and the other end abuts against the adjusting piston 112. When the pressure inside the transmission pipeline 11 exceeds a preset range, the medium pressure pushes the adjusting piston 112 to compress the reset spring 111, expanding the effective volume of the resettable explosion suppression chamber assembly 12 to buffer the pipeline pressure. (Not shown in the accompanying drawings) The outer wall of the adjusting piston 112 is provided with a sealing ring, achieving a sliding seal with the inner wall of the cavity of the detachable outer shell 13. The preload of the reset spring 111 can be adjusted by adjusting bolts on the detachable outer shell 13 to adapt to natural gas pipelines with different pressure thresholds.

[0050] like Figure 1 and Figure 2 As shown, if the external pipeline is directly disconnected during the inspection, maintenance or replacement of the valve device, it will affect the operation of the entire natural gas system. Therefore, in this embodiment, shut-off valves 110 are installed at both ends of the transmission pipeline 11 to realize independent on / off control between the device and the external system.

[0051] Both the inlet and outlet ends of the transmission pipeline 11 are equipped with shut-off valves 110, which are used to control the connection and disconnection between the transmission pipeline 11 and the external natural gas pipeline.

[0052] In summary, the present invention also has the following combined effects:

[0053] Under normal operating conditions, the shut-off valves 110 at both ends of the transmission pipeline 11 are open, allowing natural gas to flow smoothly; the adjusting piston 112 of the resettable explosion suppression chamber assembly 12 maintains its initial position under the preload of the reset spring 111, ensuring stable chamber volume; the flame arrester core 23 is in its initial clearance position within the flange connection pipe 21, and the drive motor 26 and emergency shut-off valve 14 are both in standby mode.

[0054] When the thermal sensor 15 detects an over-temperature signal or the pressure sensor 18 detects an over-pressure signal, the abnormal trigger response is as follows: the signal is transmitted to the controller 19 via the transmission pipeline, and the controller 19 simultaneously controls the emergency shut-off valve 14 to close; at the same time, the drive motor 26, through the transmission structure of gears, threaded rods 22 and sliding rods 25, drives the flame arrestor core 23 to move to the sealing surface of the closed shut-off valve core and position it, thereby achieving the sealing and blocking of the medium channel; the controller 19 simultaneously opens the electrically controlled valve of the gas injection port 17 to inject rare explosion-suppressing gas into the pipeline to enhance the explosion-suppressing effect; if the pipeline is over-pressurized, the medium pressure pushes the adjusting piston 112 of the resettable explosion-suppressing chamber to compress the reset spring 111, thereby expanding the effective volume of the chamber and buffering the sudden pressure change in the pipeline.

[0055] In maintenance mode, closing the shut-off valves 110 at both ends of the transmission pipeline 11 allows for independent connection and disconnection between the device and the external natural gas pipeline, facilitating the inspection and maintenance of the device.

[0056] With strong responsiveness and coordination, the integrated linkage of "sensors, controller 19, and actuators" enables synchronized actions of "over-temperature and over-pressure monitoring, cut-off, flame arrest, explosion suppression, and pressure buffering," solving the problems of delayed response and functional disconnect in traditional decentralized protection devices. High operational reliability is achieved through the seamless timing and path of the flame arrestor core 23 and the emergency cut-off valve 14. Furthermore, the flame arrestor core 23 is guided and driven by the threaded rod 22 and sliding rod 25, ensuring precise sealing position. The sealing ring design of the adjusting piston 112 also prevents leakage of the medium in the explosion suppression chamber. The comprehensive protection layers integrate multiple protection logics: "physical sealing (cut-off, flame arrest), chemical explosion suppression (rare gases), and pressure buffering (resettable explosion suppression chamber)," covering different scenarios of over-temperature, over-pressure, and explosion risks. Excellent adaptability and maintainability are ensured by the adjustable preload of the reset spring 111 in the resettable explosion suppression chamber, adapting to natural gas pipelines with different pressure thresholds. The two end shut-off valves 110 allow for independent on / off operation of the device, eliminating the need for maintenance to affect the normal operation of the external natural gas system.

[0057] The embodiments of the present invention have been described above, but the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention, all of which are within the protection scope of the present invention.

Claims

1. A natural gas fire prevention and explosion suppression valve device, characterized in that, include: The transmission pipeline (11) is sequentially connected with a resettable explosion suppression chamber assembly (12) and an emergency shut-off valve (14) along the direction of medium flow. The resettable explosion suppression chamber assembly (12) and the emergency shut-off valve (14) are connected and installed through a flange connection pipe (21). A movable flame arrestor core (23) is provided inside the cavity of the flange connection pipe (21). The flame arrestor core (23) can move between the initial position and the valve core sealing surface of the emergency shut-off valve (14). The thermal sensor (15) and the pressure sensor (18) are both mounted at the air inlet end of the transmission pipeline (11). The thermal sensor (15) and the pressure sensor (18) are both connected to the controller (19) for signal connection. At the same time, the controller (19) is used to control the opening and closing of the emergency shut-off valve (14). When the monitoring signal of the thermal sensor (15) exceeds the preset threshold, the valve core of the emergency shut-off valve (14) closes and the flame arrester core (23) moves to fit against the valve core sealing surface of the emergency shut-off valve (14). After receiving the over-temperature signal from the thermal sensor (15), the controller (19) synchronously sends a forward rotation signal to the drive motor (26), and the drive motor (26) drives the flame arrestor core (23) to move towards the valve core sealing surface of the emergency shut-off valve (14); when the flame arrestor core (23) is in contact with the valve core sealing surface, the drive motor (26) automatically cuts off the power and keeps the flame arrestor core (23) in its current position; When the flame arrestor core (23) moves to fit against the valve core sealing surface of the emergency shut-off valve (14), the valve core of the emergency shut-off valve (14) is already in a fully closed state, and the moving path of the flame arrestor core (23) does not interfere with the rotation path of the valve core of the emergency shut-off valve (14). The flange connecting pipe (21) is provided with a sliding rod (25) for sliding installation of the flame arrestor core (23), and the flange connecting pipe (21) is provided with a threaded rod (22) for driving the flame arrestor core (23) to move. The flame arrestor core (23) is provided with a sliding hole (29) corresponding to the sliding rod (25) and a threaded hole (28) corresponding to the threaded rod (22). The flange connecting pipe (21) is provided with a flange groove (27). The drive motor (26) is installed outside the flange connecting pipe (21). At the same time, the output shaft of the drive motor (26) extends into the inside of the flange connecting pipe (21) through the flange groove (27). The output shaft of the drive motor (26) drives the threaded rod (22) to rotate through the drive gear (24), thereby realizing the movement drive of the flame arrester core (23).

2. The natural gas fire prevention and explosion suppression valve device according to claim 1, characterized in that, The gas inlet of the transmission pipeline (11) is also connected to a gas injection port (17), and an electric control valve is provided at the gas injection port (17). When the thermal sensor (15) or the pressure sensor (18) detects an abnormal signal, the controller (19) synchronously controls the electric control valve to open and inject rare explosion suppression gas into the transmission pipeline (11) through the gas injection port (17).

3. A natural gas fire prevention and explosion suppression valve device according to claim 2, characterized in that, The thermal sensor (15) and the pressure sensor (18) are connected to the controller (19) via the signal transmission line (16). The controller (19) controls the electronic control valve at the gas injection port (17) via a branch of the signal transmission line (16).

4. A natural gas fire prevention and explosion suppression valve device according to claim 1, characterized in that, The resettable explosion suppression chamber assembly (12) includes a detachable outer shell (13), a reset spring (111), and an adjusting piston (112). The adjusting piston (112) is movably and sealed within the cavity of the detachable outer shell (13). One end of the reset spring (111) abuts against the inner wall of the detachable outer shell (13), and the other end abuts against the adjusting piston (112). When the pressure in the transmission pipeline (11) exceeds the preset range, the medium pressure pushes the adjusting piston (112) to compress the reset spring (111), thereby expanding the effective volume of the resettable explosion suppression chamber assembly (12) to buffer the pipeline pressure.

5. A natural gas fire prevention and explosion suppression valve device according to claim 4, characterized in that, The outer wall of the regulating piston (112) is provided with a sealing ring, which achieves a sliding seal with the inner wall of the cavity of the detachable outer shell (13); the preload of the reset spring (111) can be adjusted by the adjusting bolt on the detachable outer shell (13) to adapt to natural gas pipelines with different pressure thresholds.

6. A natural gas fire prevention and explosion suppression valve device according to claim 1, characterized in that, Both the inlet and outlet ends of the transmission pipeline (11) are equipped with shut-off valves (110), which are used to control the connection and disconnection between the transmission pipeline (11) and the external natural gas pipeline.

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