Leather membrane, leather membrane assembly and gas pipeline micro-leakage automatic shut-off valve of leather membrane assembly

Abstract

The utility model discloses a leather membrane, a leather membrane assembly and a gas pipeline micro-leakage automatic shut-off valve of the leather membrane assembly, and relates to the technical field of structural design of gas pipeline safety equipment. The leather membrane comprises a connecting ring, a springback part and a sealing part, the springback part is open, the connecting ring is integrally formed on the edge of the springback part, the center of the springback part is fixedly connected with the sealing part, and the sealing part is cylindrical. The membrane assembly further comprises a driving assembly which is fixedly connected along the center of the sealing part. According to the gas pipeline micro-leakage automatic shut-off valve, a leather membrane assembly is connected to the interior of a gas pipeline. Through the change of pressure on the two sides of the leather film, the springback part in an opening shape generates elastic deformation, and it is ensured that when the gas pipe generates micro-leakage, the closing valve can cut off gas in time through the leather film. The sealing part is pushed through the leather membrane driving structure to enable the closed leather membrane to be opened again, gas circulation is ensured, meanwhile, the leather membrane is fixed to the valve shell and the valve deck, and the pressure difference between the two sides of the leather membrane is adjusted through the cavity of the valve shell and the cavity of the valve deck.

Description

Technical Field

[0001] This utility model relates to the technical field of structural design of safety equipment for gas pipelines, and in particular to a diaphragm, a diaphragm assembly and an automatic shut-off valve for micro-leakage in gas pipelines. Background Technology

[0002] As a vital infrastructure for urban energy transmission, the safety of gas pipelines is directly related to public safety and environmental protection. Even minor leaks, if not detected and addressed promptly, can accumulate indoors, potentially leading to explosions or fires if exposed to open flames or static electricity. With the widespread use of gas in daily life and industrial production, ensuring safe gas usage is of paramount importance.

[0003] Currently, gas pipeline valves commonly use mechanical spring-type or electronic induction-type shut-off devices. However, these devices suffer from several problems: mechanical springs rely on pressure difference for triggering, resulting in a significant delay in response, especially in micro-leakage scenarios, leading to insufficient response speed. Secondly, traditional valve sealing structures are prone to leakage due to wear or elasticity failure during long-term use. Furthermore, electronic valves require continuous power supply or regular maintenance, and may fail in the event of a power outage or extreme conditions.

[0004] Furthermore, in actual use, the pressure fluctuations and flow changes of gas pipeline systems are relatively frequent. Existing valves lack the ability to effectively adapt to these changes and are difficult to work stably under different operating conditions, which further reduces the safety and stability of gas use.

[0005] It is evident that existing gas valves suffer from problems such as slow response speed, unreliable sealing, and redundant structure, making it difficult to achieve automatic detection and automatic blocking of micro-leakage in gas pipelines. Utility Model Content

[0006] In view of this, the main purpose of this utility model is to provide a diaphragm, a diaphragm assembly and an automatic shut-off valve for micro-leakage in gas pipelines, which can solve the problems of insufficient sealing reliability, insufficient response speed and easy closure of shut-off valves under external force in the prior art. In the case of micro-leakage, a change in gas pressure difference occurs on both sides of the diaphragm, which can drive the diaphragm to reset through the release of elastic deformation of the diaphragm and the magnetic attraction force of the driving magnet, thereby blocking the gas.

[0007] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0008] The membrane includes: a connecting ring, a resilient part, and a sealing part. The resilient part is open, and the connecting ring is integrally formed at the edge of the resilient part. The sealing part is fixedly connected to the center of the resilient part.

[0009] In a preferred embodiment, the sealing portion is cylindrical.

[0010] In a preferred embodiment, one end of the sealing part and the spring-loaded part are integrally formed, and the other end of the sealing part is provided with a sealing protrusion ring.

[0011] In a preferred embodiment, the sealing ring is disposed at the edge of the sealing portion.

[0012] The membrane assembly further includes a drive assembly, which is fixedly connected along the center of the sealing portion.

[0013] In a preferred embodiment, the drive assembly includes: a fixed housing and a movable component, wherein the edge of the fixed housing and the connecting ring are pressed and sealed together, and a through hole is provided in the center of the fixed housing, through which the movable component is disposed;

[0014] In a preferred embodiment, the movable component and the sealing portion are fixedly connected.

[0015] In a preferred embodiment, the movable component includes: a drive rod, a threaded rod, a connecting cylinder, and a drive magnet; one end of the threaded rod is integrally formed with the drive rod, the other end of the threaded rod is threadedly connected to the connecting cylinder, and the other end of the connecting cylinder is fixedly connected to the drive magnet;

[0016] In a preferred embodiment, the threaded rod passes through the center of the sealing part and is fixedly connected to the sealing part;

[0017] In a preferred embodiment, the connecting cylinder passes through the through hole.

[0018] In a preferred embodiment, the diameter of the drive rod is larger than the diameter of the threaded rod, and the drive rod is pressed against the end of the sealing part.

[0019] In a preferred embodiment, the driving magnet is a magnetic ring with an open hole at its center. A screw passes through the open hole and presses the magnetic ring to the end of the connecting cylinder.

[0020] The gas pipeline has a micro-leakage automatic shut-off valve, and the diaphragm assembly is connected inside the gas pipeline.

[0021] In a preferred embodiment, the diaphragm assembly is sealed and connected on both sides by a valve housing and a valve cover, the valve housing is fixedly connected inside the gas pipeline, and the gas pipeline is connected inside the valve housing;

[0022] In a preferred embodiment, the gas pipeline is blocked near the center of the valve housing by a diaphragm assembly, or the gas pipeline is open away from the center of the valve housing by a diaphragm assembly.

[0023] The present invention relates to a diaphragm, a diaphragm assembly, and an automatic shut-off valve for micro-leakage in gas pipelines, which has the following beneficial effects:

[0024] The diaphragm includes a connecting ring, a rebound portion, and a sealing portion. The rebound portion is open, with the connecting ring integrally formed at its edge. The sealing portion, which is cylindrical, is fixedly connected to the center of the rebound portion. The diaphragm assembly also includes a drive assembly, which is fixedly connected along the center of the sealing portion. This automatic shut-off valve for micro-leaks in gas pipelines includes a diaphragm assembly connected inside the gas pipeline.

[0025] The diaphragm, diaphragm assembly, and automatic shut-off valve for minor leaks in the gas pipeline utilize the pressure difference across the diaphragm. This pressure difference causes elastic deformation of the open, rebounding section and magnetic attraction from the driving magnet, ensuring that the shut-off valve can promptly block gas leaks by resetting the diaphragm. Secondly, the diaphragm drive structure pushes the drive assembly, causing the sealing section of the closed diaphragm to deform towards the pressure chamber under the pressure difference, maintaining the gas passage's openness and ensuring normal gas flow. Simultaneously, the diaphragm is fixed by the valve body and valve cover, and the pressure difference across the diaphragm is adjusted through the cavities of the valve body and valve cover. The valve cover body connects to external gas pressure via a conductive element, forming a stable external pressure chamber between the diaphragm, valve cover, and valve body. This allows the diaphragm assembly to respond promptly and seal off the gas leak in the event of a minor leak. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a membrane according to one embodiment of the present disclosure;

[0028] Figure 2 This is a schematic diagram of the membrane structure from another angle according to one embodiment of the present disclosure;

[0029] Figure 3 This is a cross-sectional view of a membrane according to one embodiment of the present disclosure;

[0030] Figure 4 This is a schematic diagram of the structure of the fixing shell of the membrane assembly according to one embodiment of the present disclosure;

[0031] Figure 5 This is a cross-sectional view of the fixing shell of a membrane assembly according to one embodiment of the present disclosure;

[0032] Figure 6 This is a schematic diagram of the drive rod and threaded rod of a membrane assembly according to one embodiment of the present disclosure;

[0033] Figure 7 A schematic diagram of the drive magnet and screw of a membrane assembly according to one embodiment of the present disclosure;

[0034] Figure 8 This is a schematic diagram of the structure of the drive rod of the diaphragm assembly according to one embodiment of the present disclosure, supported inside the valve housing.

[0035] Figure 9 This is a cross-sectional view of the valve body and valve cover of an automatic shut-off valve for micro-leakage in a gas pipeline according to one embodiment of the present disclosure.

[0036] Figure 10 A cross-sectional view of a drive assembly of a membrane assembly according to one embodiment of the present disclosure;

[0037] Figure 11 This is a cross-sectional view of the interior of an automatic shut-off valve for micro-leakage in a gas pipeline according to one embodiment of the present disclosure.

[0038] [Explanation of Key Component Symbols]

[0039] 03. Membrane assembly;

[0040] 031. Connecting ring; 032. Springback part; 033. Sealing part;

[0041] 0331, Sealing convex ring;

[0042] 14. Driver components;

[0043] 141. Fixed shell;

[0044] 1411. Through hole;

[0045] 142. Activity Components;

[0046] 1421. Drive rod; 1422. Threaded rod; 1423. Connecting cylinder; 1424. Drive magnet; 15. Screw. Detailed Implementation

[0047] The following description, in conjunction with the accompanying drawings and embodiments of the present invention, provides a more detailed account of a diaphragm, a diaphragm assembly, and an automatic shut-off valve for micro-leakage in gas pipelines.

[0048] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0049] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0050] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0051] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0052] according to Figures 1-3As shown, the membrane includes a connecting ring 031, a spring-loaded portion 032, and a sealing portion 033. The spring-loaded portion 032 is open, and the connecting ring 031 is integrally formed along the edge of the spring-loaded portion 032. The sealing portion 033 is fixedly connected to the center of the spring-loaded portion 032. To enable the membrane to seal under a specific shape, the spring-loaded portion 032 is open, providing a larger contact area during elastic deformation, thus ensuring a sealing effect. Its shape also allows for a smooth transition to the connecting ring 031. The connecting ring 031 is pressed tightly by the housing 01 and the valve cover 02, further limiting its position. The sealing portion 033 is fixedly connected to the spring-loaded portion 032 and is cylindrical. When the diaphragm is in the closed state, and the sealing part 033 is subjected to a thrust, it moves along its own axial direction, causing the rebound part 032 to move towards the valve cover 02. At this time, the connecting ring 031 is pressed and fixed by the edges of the housing 01 and the valve cover 02, and the sealing part 033 is integrally formed with the connecting ring 031, so the sealing part 033 undergoes elastic deformation, thereby abutting against the fixed housing 141. One side of the diaphragm is connected to the gas pipeline, and the other side is connected to the pressure chamber with stable atmospheric pressure inside the valve cover 02.

[0053] To further explain the formation of a stable pressure chamber within the gas passage by connecting the valve cover 02 to external gas pressure via a conductive element, the conductive element connected to the valve cover 02 body connects to the external atmospheric pressure of the gas pipeline, forming a stable pressure chamber connected to the outside with the diaphragm assembly 03 near the valve cover 02. This pressure chamber allows for a change in pressure difference across the diaphragm when a minor leak occurs inside the valve body. In other words, one side of the diaphragm is a stable pressure chamber connected to external gas pressure, while the other side, under normal gas flow, maintains an open state due to the higher internal gas pressure compared to the external gas pressure caused by elastic deformation of the diaphragm, as the gas pressure inside the gas pipeline is greater than the external pressure. However, in the event of a minor leak, the internal gas pressure in the gas pipeline leaks, and when the pressure difference is less than or equal to the pressure in the pressure chamber connected to the external gas pressure, the diaphragm cannot maintain its elastic deformation state, thus failing to seal against the valve body 01 and block the gas pipeline. Therefore, the diaphragm can respond quickly.

[0054] During normal operation of the gas system, the blocking side is the gas passage near the movable component 142. When gas is supplied normally, the gas pressure on the blocking side is higher than the pressure of the externally connected pressure chamber. Driven by the diaphragm drive structure 16, the diaphragm overcomes the magnetic attraction of the drive magnet 1424 and the elastic force of the diaphragm itself, opening towards the pressure chamber. Gas flows from the opening of the diaphragm to the blocking side. At this time, the diaphragm drive structure 16 resets. Because the gas pressure on the blocking side is higher than the pressure of the pressure chamber connected to the outside on the other side of the diaphragm, the diaphragm maintains its elastic deformation state. The gas passage remains open; at this time, the diaphragm is in the open state, maintaining normal gas supply.

[0055] When a micro-leak occurs, the gas pressure on the blocking side decreases, and the pressure on the side of the diaphragm connected to the gas passage decreases, while the pressure in the pressure chamber remains unchanged. Therefore, its pressure is less than the pressure in the pressure chamber on the other side of the diaphragm, where the atmospheric pressure is stable. Alternatively, as the gas leaks outward, the gas pressure inside the gas passage becomes equal to the pressure in the pressure chamber. At this time, due to the change in pressure difference across the diaphragm, coupled with the elasticity of the diaphragm itself and the magnetic attraction of the driving magnet 1424, the diaphragm returns to its initial position, releasing its elastic deformation, closing the valve passage, and preventing further gas flow. In other words, when a micro-leak occurs inside the gas passage, if the internal gas pressure is less than the external gas pressure, the external gas pressure will exert an inward pressure on the side of the diaphragm connected to the atmospheric pressure, while the outward pressure of the internal gas pressure on the diaphragm is smaller, thus creating a pressure difference pointing inward into the gas passage. In the event of a slight leak, the air pressure on both sides of the diaphragm is equal. At this time, the elastic deformation of the diaphragm in the open state cannot be maintained. The release of the elastic deformation drives the diaphragm to reset. In addition, the magnetic attraction force generated by the driving magnet 1424 towards the fixed shell 141 causes the moving component 142 to further drive the diaphragm to reset. The sealing part 033 is tightly attached to the blocking position on the shell 01, thereby closing the air intake channel and blocking the flow of gas. At this time, the diaphragm is in the closed state.

[0056] To ensure accurate positioning of the diaphragm sealing part 033 during diaphragm opening and closing, thereby improving the sealing effect, one end of the sealing part 033 and the rebound part 032 are integrally formed, and the other end of the sealing part 033 is provided with a sealing protrusion ring 0331. The cross-section of the sealing protrusion ring 0331 includes semicircles, ellipses, and other irregular shapes (a semicircular structure is preferred in this application). When the sealing protrusion ring 0331 contacts the valve body 01, it forms an annular sealing surface, increasing the sealing contact area. At the same time, the elastic deformation of the sealing protrusion ring 0331 compensates for surface unevenness, thereby improving the reliability of the seal.

[0057] To further increase the size of the ventilation channel and reduce the area affected by gas pressure in the sealing part 033, a sealing ring 0331 is provided at the edge of the sealing part 033. The sealing ring 0331 is located at the edge of the sealing part 033, circumferentially surrounding it. Due to the structure at the connection between the sealing ring 0331 and the sealing part 033, the space for gas flow is further increased when the diaphragm is open. When gas enters from the internal guide groove of the valve body, the size of the sealing ring 0331 and its curved edge also reduce the area affected by gas pressure, increasing the force difference between the two sides. This allows the diaphragm to fit more tightly against the body when closed, increasing sealing performance and reducing the possibility of gas leakage.

[0058] according to Figures 4-10As shown, the membrane assembly includes the aforementioned membrane. To enable the membrane to open when closed, it further includes a drive assembly 14, which is fixedly connected along the center of the sealing portion 033. The drive assembly 14 transmits external driving force through the membrane drive structure 16, overcomes the elastic resistance of the rebound portion 032, and drives the sealing portion 033 to move axially, thereby achieving active opening control of the membrane.

[0059] To fix the diaphragm position and thus achieve its function of blocking gas flow, the drive assembly 14 includes a fixed housing 141 and a movable assembly 142. The edge of the fixed housing 141 and the connecting ring 031 are pressed and sealed together. The connecting ring 031 is clamped between the fixed housing 141 and the valve body 01, ensuring that the diaphragm assembly is fixedly fixed within the valve body. A through hole 1411 is provided in the center of the fixed housing 141 to ensure that gas can flow when the diaphragm is open and the sealing part 033 is away from the through hole 1411. The movable assembly 142 is disposed through the through hole, which allows the movable assembly 142 to move axially. The structure is compact and the sealing performance is reliable. The movable assembly 142 and the sealing part 033 are fixedly connected to ensure that the movement of the movable assembly can drive the sealing part 033 to move.

[0060] To keep the diaphragm open during operation and prevent it from closing due to external force, the movable component 142 includes a drive rod 1421, a threaded rod 1422, a connecting cylinder 1423, and a drive magnet 1424. One end of the threaded rod 1422 is integrally formed with the drive rod 1421, and the other end of the threaded rod 1422 is threadedly connected to the connecting cylinder 1423. When the drive rod 1421 is pushed by an external force, the threaded rod 1422 drives the diaphragm and the connecting cylinder 1423 to move axially toward the valve cover 02. The other end of the connecting cylinder 1423 is fixedly connected to the drive magnet 1424. When the drive magnet 1424 abuts against the inside of the valve cover 02, it will be attracted to the inner end face of the valve cover 02 due to its magnetic force. Correspondingly, the rebound portion 032 of the diaphragm also abuts against the end face of its fixed shell 141 after undergoing elastic deformation. In the gas flow state, the diaphragm is in the open state. The sealing part 2 has two through holes at its center. A threaded rod 1422 passes through the center of the sealing part 033 and is fixedly connected to the sealing part 033. The length of the threaded rod 1422 is greater than the length of the through hole in the sealing part 033. After passing through the sealing part 033, a portion of the threaded rod 1422 extends out of the sealing part 033 and is threadedly connected to the connecting cylinder 1423. The connecting cylinder 1423 passes through the through hole 1411. The threaded engagement between the threaded rod 1422 and the sealing part 033 and the connecting cylinder 1423 can be used to maintain the working state of the diaphragm by driving the position of the magnet 1424, utilizing magnetic force and the self-locking characteristic of the thread, thus preventing accidental closure due to external interference.

[0061] A through hole is provided in the middle of the valve body, and a support ring is provided inside the through hole. Multiple support rods are integrally formed around the outer wall of the support ring, and the support rods are integrally formed with the inner wall of the through hole. The drive rod 1421 passes through the integrally formed support ring in the middle of the valve body and is supported by the inner wall of the support ring.

[0062] To ensure pressure dispersion of the driving rod 1421 on the sealing part 033 and prevent damage to the transition connection between the diaphragm through hole and the driving rod 1421 and threaded rod 1422 due to pressure concentration, thereby affecting the sealing performance, the diameter of the driving rod 1421 is larger than the diameter of the threaded rod 1422, and the driving rod 1421 is pressed tightly against the end of the sealing part 033. The increased diameter of the driving rod 1421 ensures that its end forms a stable contact surface with the sealing part 033, evenly dispersing pressure, preventing local pressure concentration, and enhancing the guiding performance of the sealing part 033 during axial movement.

[0063] In order to fix the drive magnet 1424 and cooperate with the threaded rod 1422 to realize the magnetic ring function, the drive magnet 1424 is a magnetic ring with an open hole in the center. A screw 5 is installed through the open hole. The screw 5 passes through the open hole in the center of the magnetic ring and presses the connecting cylinder 1423 to achieve rigid fixation of the drive magnet 1424 and ensure magnetic force transmission efficiency. At the same time, if the micro-leakage valve closes due to micro-leakage during the adsorption process, the membrane will close due to the pressure difference on both sides. The adsorption force of the drive magnet 1424 will not affect the closure of the membrane, and the sealing part 033 moves closer to the housing 01.

[0064] according to Figure 11 As shown, this automatic shut-off valve for minor leaks in the gas pipeline includes the aforementioned diaphragm assembly, which is connected inside the gas pipeline, to ensure the diaphragm assembly operates with gas. The diaphragm and its drive assembly 14 are located inside the valve body and can quickly block the airflow through the sealing part 033 when a minor leak is detected, preventing continuous gas leakage and improving pipeline safety.

[0065] The diaphragm assembly is sealed on both sides by the valve body 01 and the valve cover 02. The valve body 01 is fixedly connected inside the gas pipeline, and the gas pipeline flows through the inside of the valve body 01. The gas pipeline can be blocked or closed by the diaphragm assembly in the middle of the valve body 01, or the gas pipeline can be opened or closed by the diaphragm assembly in the middle of the valve body 01 away from the valve body. The bidirectional sealing structure of the valve body 01 and the valve cover 02 ensures the sealing of the gas passage and allows for flexible switching between the open and closed states by the axial displacement of the diaphragm assembly, adapting to different operating conditions.

[0066] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the utility model.

Claims

1. A membrane, characterized in that, include: The assembly includes a connecting ring (031), a spring-loaded part (032), and a sealing part (033). The spring-loaded part (032) is open-shaped, and the edge of the spring-loaded part (032) is integrally formed with the connecting ring (031). The center of the spring-loaded part (032) is fixedly connected to the sealing part (033). The sealing part (033) is cylindrical.

2. The membrane according to claim 1, characterized in that, One end of the sealing part (033) and the spring-loaded part (032) are integrally formed, and the other end of the sealing part (033) is provided with a sealing ring (0331).

3. The membrane according to claim 2, characterized in that, The sealing ring (0331) is located at the edge of the sealing part (033).

4. A membrane assembly, characterized in that, The membrane according to any one of claims 1-3 further includes a drive assembly (14) fixedly connected along the center of the sealing portion (033).

5. The membrane assembly according to claim 4, characterized in that, The drive assembly (14) includes a fixed shell (141) and a movable assembly (142). The edge of the fixed shell (141) and the connecting ring (031) are pressed and sealed together. A through hole (1411) is provided in the center of the fixed shell (141), and the movable assembly (142) is disposed through the through hole. The active component (142) and the sealing part (033) are fixedly connected.

6. The membrane assembly according to claim 5, characterized in that, The movable component (142) includes: a drive rod (1421), a threaded rod (1422), a connecting cylinder (1423), and a drive magnet (1424); one end of the threaded rod (1422) is integrally formed with the drive rod (1421), the other end of the threaded rod (1422) is threadedly connected to the connecting cylinder (1423), and the other end of the connecting cylinder (1423) is fixedly connected to the drive magnet (1424). The threaded rod (1422) passes through the center of the sealing part (033) and is fixedly connected to the sealing part (033); The connecting cylinder (1423) passes through the through hole (1411).

7. The membrane assembly according to claim 6, characterized in that, The diameter of the drive rod (1421) is larger than the diameter of the threaded rod (1422), and the drive rod (1421) is pressed against the end of the sealing part (033).

8. The membrane assembly according to claim 6, characterized in that, The driving magnet (1424) is a magnetic ring with an open hole in the center. A screw (15) is installed through the open hole and the screw (15) presses the magnetic ring to the end of the connecting cylinder (1423).

9. An automatic shut-off valve for minor leaks in gas pipelines, characterized in that, The membrane assembly includes any one of claims 4-8, wherein the membrane assembly is connected inside the gas pipeline.

10. The automatic shut-off valve for minor leaks in gas pipelines according to claim 9, characterized in that, The diaphragm assembly is sealed and connected on both sides by a valve housing (01) and a valve cover (02). The valve housing (01) is fixedly connected inside the gas pipeline, and the gas pipeline is connected inside the valve housing (01). The gas pipeline is blocked by a diaphragm assembly (03) near the middle of the valve housing (01), or the gas pipeline is opened by a diaphragm assembly (03) away from the valve housing (01).

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