A shut-off valve mechanism for a gas valve

Abstract

This utility model relates to the field of gas valve technology, and in particular to a shut-off valve mechanism for a gas valve, including a pressure regulating module, a main valve shaft, a main valve sleeve, a shut-off spring, a main piston, a valve gasket body, a valve gasket pressure ring, and a valve gasket cover. The lower end of the pressure regulating module houses the main valve shaft for supporting and guiding the operation of the entire gas valve. A main valve sleeve is mounted around the outside of the main valve shaft. A shut-off spring is installed at the center of the lower end of the main valve shaft, which pushes the main piston downwards to close the valve when the system detects a need to cut off the gas supply. The lower end of the shut-off spring is fixedly connected to the main piston, which opens or closes the gas passage by moving up and down. This utility model enables the shut-off spring to quickly push the main piston downwards when a gas leak is detected, thus rapidly closing the valve and effectively reducing the occurrence and spread of dangerous situations.

Description

Technical Field

[0001] This utility model relates to the field of gas valve technology, and in particular to a shut-off valve mechanism for a gas valve. Background Technology

[0002] Gas valves are a new type of safety device for gas pipeline engineering. They are used to cut off, connect, and regulate the gas in the pipeline. They have good control characteristics and sealing performance. They are suitable for pipelines carrying various gas media such as city gas, liquefied petroleum gas, natural gas, and oxygen. Gas valves have a wide range of applications and are available in many types. They can be driven by manual, worm gear, electric, pneumatic, hydraulic, and electro-hydraulic actuators, and can achieve remote control and automated operation.

[0003] Meanwhile, traditional gas shut-off valves typically rely on manual operation or simple mechanical triggering to close the valve. For example, some systems require operators to manually close the valve, or the electric or pneumatic actuator will take action after a pressure sensor sends a signal. This multi-link linkage method often has a response delay. In the event of a gas leak, pipeline rupture, or other emergency, the gas source cannot be cut off in time, leading to an expansion of the danger. Moreover, many traditional valves do not have automatic and rapid shut-off functions. Even if they are equipped with an automatic control system, their actuators may delay the optimal shut-off time due to their complex structure and slow operation. Utility Model Content

[0004] In order to overcome the problem that conventional valves may not be able to react quickly when a gas leak is detected or other situations require immediate shut-off of the gas supply, and that conventional valves may have problems with poor sealing, this utility model provides a shut-off valve mechanism for gas valves.

[0005] The technical solution is as follows: A shut-off valve mechanism for a gas valve includes a pressure regulating module, a main valve shaft, a main valve sleeve, a closing spring, a main piston, a valve pad body, a valve pad pressure ring, and a valve pad cover. The lower end of the pressure regulating module is equipped with a main valve shaft for supporting and guiding the operation of the entire gas valve. A main valve sleeve is installed around the outside of the main valve shaft. A closing spring is installed at the center of the lower end of the main valve shaft to push the main piston downward when the system detects that the gas supply needs to be cut off, thereby closing the valve. The lower end of the closing spring is fixedly connected to the main piston for opening or closing the gas passage by moving up and down. A valve pad body for preventing gas leakage is installed around the lower surface of the main piston near the edge. A valve pad pressure ring is installed at the center of the outer side of the main piston. Two sets of valve pad covers are symmetrically installed on both sides of the lower surface of the main piston. The main piston and the valve pad covers are threadedly connected to each other.

[0006] Furthermore, a shaft elastic retaining ring is installed laterally inside the lower end of the main valve shaft, a support ring is threadedly connected to the lower surface of the main valve sleeve, a bottom cover is threadedly connected to the lower surface of the support ring, and valve bodies are symmetrically installed on both sides of the support ring.

[0007] Furthermore, a fixing bracket is installed at the center of the lower end of the main piston, and a baffle plate is installed between the fixing bracket and the valve body.

[0008] Furthermore, ferrule connectors are installed at the center of the upper end of the valve body and on both sides of the pressure regulating module, and a signal tube is linearly connected between the valve body and the pressure regulating module.

[0009] Furthermore, an elbow is installed at the center of one of the valve body side surfaces, and a signal tube is also installed between the elbow and the compression fitting.

[0010] Furthermore, a connector body is installed at the center of the side surface of another set of valve bodies, and a metal hose is linearly connected between the connector body and the ferrule connector.

[0011] Furthermore, a control panel is mounted at the center of the pressure regulating module surface, and a second cylindrical head screw is threaded between the main valve sleeve and the pressure regulating module.

[0012] Furthermore, a connecting groove is provided inside the main valve sleeve on one side of the main valve shaft, and a first cylindrical head screw that connects to the pressure regulating module is threaded in the center of the connecting groove.

[0013] The beneficial effects are as follows: This utility model enables the closing spring to quickly push the main piston downward when the system detects a situation requiring the cut-off of gas supply, such as a gas leak, thereby achieving the function of rapidly closing the valve. This effectively reduces the occurrence and spread of dangerous situations. The design of the valve gasket body, valve gasket pressure ring, and valve gasket cover greatly enhances the sealing performance when the valve is closed, effectively preventing gas leaks and improving safety. The application of components such as the shaft elastic retaining ring, support ring, and bottom cover not only increases the stability of the entire mechanism but also improves its durability, ensuring reliability during long-term operation. The presence of connectors such as signal tubes and metal hoses facilitates real-time monitoring of the valve status, timely detection and resolution of problems, and reduces maintenance difficulty and cost. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of a gas valve shut-off valve mechanism according to the present invention;

[0015] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0016] Figure 3 This is a schematic diagram of the cross-sectional structure of the metal flexible hose of this utility model;

[0017] Figure 4 This is a three-dimensional structural diagram of the connecting groove of this utility model;

[0018] Figure 5 This is a three-dimensional structural diagram of the elbow of this utility model.

[0019] In the attached diagram, the following are the reference numerals: 1. Pressure regulating module; 2. Main valve shaft; 3. Main valve sleeve; 4. Closing spring; 5. Main piston; 6. Valve gasket body; 7. Valve gasket pressure ring; 8. Valve gasket cover; 9. Baffle plate; 10. Valve body; 11. Bottom cover; 12. Signal tube; 13. Compression fitting; 14. Fitting body; 15. Metal hose; 16. Elbow; 17. Connecting groove; 18. First cylindrical head screw; 19. Second cylindrical head screw; 20. Shaft retaining ring; 21. Control panel; 22. Support ring; 23. Fixing bracket. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] Among the currently discovered feasible technologies, the following are described:

[0022] Gas valves are a key safety accessory in new types of gas pipeline engineering, widely used in various gas transmission systems. They are primarily used to cut off, connect, and regulate the flow of media in pipelines. They not only possess excellent control characteristics but also highly reliable sealing performance, maintaining stable operation under various complex working conditions, effectively preventing gas leakage and ensuring the safe operation of the pipeline system. Gas valves are suitable for pipelines transporting various gas media such as city gas, liquefied petroleum gas, natural gas, and oxygen. They are indispensable equipment in modern industrial, commercial, and residential gas systems. Depending on different usage requirements and working environments, gas valves have a wide range of applications, covering various scenarios from low to high pressure and from small to large diameters. Gas valves come in a wide variety of types, including gate valves, ball valves, butterfly valves, check valves, safety shut-off valves, and pressure regulating valves, each with its specific function and application range. They can meet the control requirements under different media, flow rates, pressures, and temperatures. In terms of actuation methods, gas valve designs are increasingly diversified, commonly including manual operation, worm gear drive, electric actuator drive, pneumatic drive, hydraulic drive, and electro-hydraulic linkage actuators. These actuation methods can be flexibly configured according to actual working conditions, supporting not only on-site operation but also remote centralized control and automated management. They are particularly suitable for large-scale gas transmission and distribution systems, industrial furnaces, thermal power plants, chemical plants, and other locations with high requirements for safety and intelligence. Furthermore, with the development of intelligent control systems, more and more gas valves are integrating sensors, remote communication modules, and automatic alarm functions, enabling rapid response and automatic gas supply cut-off in case of abnormalities, greatly improving the safety and convenience of gas use. Through linkage with PLC control systems or SCADA systems, gas valves can achieve real-time monitoring, fault diagnosis, and emergency handling of the entire pipeline network, providing solid technical support for building an efficient, intelligent, and safe gas supply system.

[0023] Meanwhile, traditional gas shut-off valves have many limitations in practical applications, especially in responding to sudden gas accidents. These valves typically rely on manual operation or simple mechanical triggering to achieve their shut-off function. For example, in some older systems, operators still need to manually rotate handwheels or pull levers to close the valves. This method is not only inefficient, but may also lead to the escalation of the accident if personnel cannot reach the scene in time. Even if some systems are equipped with pressure sensors and automatic actuators, their control logic and execution mechanisms are relatively simple. Often, the valve is only closed by electric, pneumatic, or hydraulic devices after an abnormal pressure is detected. This multi-stage linkage control method has a significant response delay. From the sensor sensing the abnormal signal to the control system judging and activating the actuator, and then to the valve finally completing the closing action, the entire process may take several seconds or even longer. In the event of sudden accidents such as gas leaks and pipeline ruptures, every second of delay can have serious consequences, leading to large-scale gas leaks and potentially causing explosions, fires, and other catastrophic incidents, threatening people's lives and property. Furthermore, many traditional gas shut-off valves lack true rapid shut-off capability. Even those labeled with "automatic control" functions may have actuators that react slowly due to complex structures, aging components, or unstable power supply, or even malfunction or fail to operate. For example, electric actuators may experience motor jamming or power outages, while pneumatic actuators rely on external gas sources; if the gas path is blocked or the gas pressure is insufficient, they cannot complete the shut-off task in time. These defects prevent traditional valves from playing their due protective role in critical moments, seriously affecting the overall safety and reliability of the system. Therefore, with increasingly stringent safety requirements for gas systems, traditional shut-off valves can no longer meet the demands of modern urban gas pipeline networks, industrial gas equipment, and emergency safety systems for rapid response, high sealing, and intelligent control. Adopting a new generation of gas shut-off valves with advanced functions such as automatic sensing, rapid shut-off, and remote monitoring can improve the inherent safety level of gas systems.

[0024] This gas valve's shut-off mechanism design offers numerous benefits, solving several problems inherent in traditional valves and significantly improving safety, reliability, and ease of use. It features rapid response and emergency shut-off: when the system detects a gas supply leak, the shut-off spring quickly pushes the main piston downwards, rapidly closing the valve and effectively reducing the occurrence and spread of dangerous situations. The design of the valve seat body, valve seat pressure ring, and valve seat cap greatly enhances the valve's sealing performance when closed, effectively preventing gas leaks and improving safety.

[0025] like Figures 1-5As shown, a gas valve shut-off valve mechanism includes a pressure regulating module 1, a main valve shaft 2, a main valve sleeve 3, a shut-off spring 4, a main piston 5, a valve pad body 6, a valve pad pressure ring 7, and a valve pad cover 8. The main valve shaft 2, which supports and guides the operation of the entire gas valve, is installed at the lower end of the pressure regulating module 1. The main valve sleeve 3 is installed around the outside of the main valve shaft 2. A shut-off spring 4 is installed at the center of the lower end of the main valve shaft 2, which pushes the main piston 5 downward to close the valve when the system detects that the gas supply needs to be cut off. The lower end of the shut-off spring 4 is fixedly connected to the main piston 5, which opens or closes the gas passage by moving up and down. A valve pad body 6, which prevents gas leakage, is installed around the lower surface of the main piston 5 near the edge. A valve pad pressure ring 7 is installed at the center of the outer side of the main piston 5. Two sets of valve pad covers 8 are symmetrically installed on both sides of the lower surface of the main piston 5. The main piston 5 and the valve pad covers 8 are threadedly connected to each other.

[0026] A shaft elastic retaining ring 20 is horizontally installed inside the lower end of the main valve shaft 2. A support ring 22 is threadedly connected to the lower surface of the main valve sleeve 3. A bottom cover 11 is threadedly connected to the lower surface of the support ring 22. Valve bodies 10 are symmetrically installed on both sides of the support ring 22, which realizes the stable support and modular assembly of the main valve structure, facilitates disassembly and maintenance, and enhances the overall stability of the system. A fixing bracket 23 is installed at the center of the lower end of the main piston 5. A baffle plate 9 is installed between the fixing bracket 23 and the valve body 10 to improve the guidance and stability of the main piston 5 during movement, prevent deviation, and improve the reliability of the shut-off action.

[0027] Under normal circumstances, the closing spring 4 is in a relaxed state, and the main piston 5 is held in a high position. At this time, gas can flow through the internal passage of the valve. The valve pad body 6, valve pad pressure ring 7, and valve pad cover 8 ensure good sealing even when gas is passing through, preventing leakage. When the system detects gas leakage or other situations that require immediate cut-off of gas supply, the control system will initiate the cut-off procedure. The closing spring 4 is triggered and begins to contract, pushing the main piston 5 downward. The main piston 5 moves downward along the direction of the main valve shaft 2, gradually closing the gas passage. The valve pad body 6 presses tightly against the valve seat as the main piston 5 moves downward, achieving a tight seal and preventing the gas from continuing to flow. During this process, components such as the shaft elastic retaining ring 20, support ring 22, and bottom cover 11 provide necessary support and guidance, ensuring that the main piston 5 can accurately complete the closing action. The pressure regulating module 1 is connected to the valve body 10 through the compression fitting 13 and linearly connected by the signal pipe 12, ensuring stable transmission of pressure signals between the pressure regulating module 1 and the valve body 10.

[0028] Please see Figures 3-4A compression fitting 13 is installed at the center of the upper end of the valve body 10 and on both sides of the pressure regulating module 1. A signal tube 12 is linearly connected between the valve body 10 and the pressure regulating module 1 to ensure stable transmission of pressure signals between the pressure regulating module 1 and the valve body 10, achieving precise control and linkage response. One set of valve body 10 has an elbow 16 installed at the center of its side surface. A signal tube 12 is also installed between the elbow 16 and the compression fitting 13, optimizing the signal transmission path in complex spatial layouts and improving the device's adaptability to different installation environments. Another set of valve body 10 has a connector body 14 installed at the center of its side surface. A metal hose 15 is linearly connected between the connector body 14 and the compression fitting 13. To enhance connection flexibility and shock resistance, adapt to vibration or thermal displacement environments, and improve system safety and durability, a control panel 21 is installed at the center of the surface of the pressure regulating module 1. A second cylindrical head screw 19 is threaded between the main valve sleeve 3 and the pressure regulating module 1, providing an intuitive operating interface and ensuring a firm connection between the pressure regulating module 1 and the main valve sleeve 3, facilitating monitoring and adjustment. A connecting groove 17 is provided inside the main valve sleeve 3 on one side of the main valve shaft 2. A first cylindrical head screw 18, which connects to the pressure regulating module 1, is threaded inside the connecting groove 17, achieving precise alignment and a stable connection between the main valve sleeve 3 and the pressure regulating module 1, ensuring the sealing and coordinated operation of the overall structure.

[0029] A compression fitting 13 is installed at the center of the upper end of the valve body 10 and on both sides of the pressure regulating module 1, and the two are linearly connected through a signal pipe 12. This design ensures that the pressure signal between the pressure regulating module 1 and the valve body 10 can be stably transmitted, thereby realizing precise monitoring and control of the valve status. An elbow 16 is installed at the center of the side surface of one set of valve bodies 10, and the elbow 16 is also connected to the compression fitting 13 through a signal pipe 12. This method is particularly suitable for situations that need to bypass obstacles or adapt to special installation angles, ensuring that the signal can be transmitted efficiently even in complex spatial layouts. A connector body 14 is installed at the center of the side surface of another set of valve bodies 10, and it is linearly connected to the compression fitting 13 through a metal hose 15. This design not only increases the flexibility of the connection, but also effectively absorbs the effects of vibration and thermal displacement, improving the safety and durability of the system, and is especially suitable for application scenarios with harsh environmental conditions. A control panel 21 is provided at the center of the surface of the pressure regulating module 1, providing an intuitive operating interface between the main valve sleeve 3 and the pressure regulating module 1, which facilitates users to monitor and adjust the system status in real time.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A shut-off valve mechanism for a gas valve, characterized in that, The system includes a pressure regulating module (1); it also includes a main valve shaft (2), a main valve sleeve (3), a closing spring (4), a main piston (5), a valve pad body (6), a valve pad pressure ring (7), and a valve pad cover (8). The pressure regulating module (1) has a main valve shaft (2) installed at its lower end to support and guide the operation of the entire gas valve. The main valve sleeve (3) is installed around the outside of the main valve shaft (2). The lower center of the main valve shaft (2) has a device for pushing the main piston (5) when the system detects that the gas supply needs to be cut off. The closing spring (4) moves downward to close the valve. The lower end of the closing spring (4) is fixedly connected to the main piston (5) for opening or closing the gas passage by moving up and down. The valve pad body (6) for preventing gas leakage is installed around the lower surface of the main piston (5) near the edge. The valve pad pressure ring (7) is installed at the center of the outer side of the main piston (5). Two sets of valve pad pressure caps (8) are symmetrically installed on both sides of the lower surface of the main piston (5). The main piston (5) and the valve pad pressure caps (8) are threadedly connected to each other.

2. The shut-off valve mechanism for a gas valve according to claim 1, characterized in that, A shaft elastic retaining ring (20) is installed laterally inside the lower end of the main valve shaft (2). A support ring (22) is threadedly connected to the lower surface of the main valve sleeve (3). A bottom cover (11) is threadedly connected to the lower surface of the support ring (22). Valve bodies (10) are symmetrically installed on both sides of the support ring (22).

3. The shut-off valve mechanism for a gas valve according to claim 1, characterized in that, A fixing bracket (23) is installed at the center of the lower end of the main piston (5), and a baffle plate (9) is installed between the fixing bracket (23) and the valve body (10).

4. A shut-off valve mechanism for a gas valve according to claim 2, characterized in that, A compression fitting (13) is installed at the center of the upper end of the valve body (10) and on both sides of the pressure regulating module (1). A signal tube (12) is linearly connected between the valve body (10) and the pressure regulating module (1).

5. A shut-off valve mechanism for a gas valve according to claim 2, characterized in that, One of the valve bodies (10) has an elbow (16) installed at the center of its side surface, and a signal tube (12) is also installed between the elbow (16) and the compression fitting (13).

6. A shut-off valve mechanism for a gas valve according to claim 2, characterized in that, Another valve body (10) has a connector body (14) installed at the center of its side surface. A metal hose (15) is linearly connected between the connector body (14) and the ferrule connector (13).

7. A shut-off valve mechanism for a gas valve according to claim 1, characterized in that, A control panel (21) is mounted on the center of the surface of the pressure regulating module (1), and a second cylindrical head screw (19) is threaded between the main valve sleeve (3) and the pressure regulating module (1).

8. A shut-off valve mechanism for a gas valve according to claim 1, characterized in that, The main valve sleeve (3) has a connecting groove (17) on one side of the main valve shaft (2), and the connecting groove (17) has a first cylindrical head screw (18) connected to the pressure regulating module (1) in the center thread.

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