A natural gas pipeline shut-off valve

Abstract

The utility model discloses a natural gas pipeline intercepting valve, including the valve seat, the valve seat is installed with the sealing washer no.

Description

Technical Field

[0001] This utility model relates to the field of shut-off valve technology, and more specifically, to a shut-off valve for a natural gas pipeline. Background Technology

[0002] Natural gas, in a narrow energy sense, refers to a mixture of hydrocarbon and non-hydrocarbon gases naturally occurring in underground strata. During transportation, pipeline systems use ball valves as their core opening and closing components to reliably control or cut off the flow of natural gas. However, existing ball valves still have the following problems in use: After prolonged use, the sealing ball surface of a ball valve is prone to wear due to continuous scouring and friction from the fluid. This wear disrupts the original tight fit between the ball and the valve seat, creating minute gaps and leading to seal failure. Once an effective seal is lost, the valve gradually loses its critical shut-off function, resulting in internal leakage and affecting the reliability of system control. Furthermore, existing ball valves are typically standardized in specifications and have fixed structural lengths. When the spacing of connecting pipelines changes due to thermal expansion and contraction, foundation settlement, or installation errors, the fixed valve dimensions cannot adapt to these dynamic changes, causing significant inconvenience during installation and sometimes requiring additional compensators or pipeline adjustments, increasing project complexity and cost.

[0003] In view of this, we propose a natural gas pipeline shut-off valve. Utility Model Content

[0004] (a) Technical problems to be solved In view of the problems existing in the prior art, this utility model provides a natural gas pipeline shut-off valve to solve the technical problems mentioned in the background art.

[0005] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: a natural gas pipeline shut-off valve, comprising a valve seat, a sealing gasket 1 installed inside the valve seat, a fixing ring fixedly connected inside the valve seat, a sealing gasket 2 fixedly connected to the fixing ring, a sealing ball 1 rotatably connected between the sealing gasket 2 and the sealing gasket 1, symmetrically distributed rotating columns rotatably connected to the valve seat, a sealing ring installed between the rotating columns and the valve seat, compression nuts threadedly connected to both the upper and lower sides of the valve seat, the rotating columns passing through the compression nuts, a rotating handle inserted into the rotating columns, a connecting nut threadedly connected to the rotating columns, a sealing ball 2 rotatably connected inside the sealing ball 1, and an extension structure provided on the valve seat.

[0006] The present invention is further configured such that one of the rotating columns is fixedly connected to the first sealing ball, and the other rotating column passes through the first sealing ball and is fixedly connected to the second sealing ball.

[0007] The present invention is further configured such that the second sealing ball is rotatably connected to and sealed with the first sealing ball.

[0008] The present invention is further configured such that the intermediate through holes of the first sealing ball and the second sealing ball are in a connected state.

[0009] The present invention is further configured such that both the upper rotating handle and the valve seat are fixedly connected to a fixing block, and a limit pin is inserted between the two fixing blocks.

[0010] The present invention is further configured such that the extension structure includes a connector, the connector is slidably connected to the valve seat, the connector is fixedly connected to two threaded rods, and the valve seat is fixedly connected to two connecting plates.

[0011] The present invention is further configured such that the threaded rod passes through the connecting plate, and the threaded rod is threadedly connected to a clamping nut.

[0012] The present invention is further configured such that a sealing ring is sleeved between the connector and the valve seat, and a compression ring is threadedly connected to the valve seat, the compression ring abutting against the sealing ring.

[0013] (III) Beneficial Effects Compared with the prior art, this utility model provides a natural gas pipeline shut-off valve, which has the following beneficial effects: 1. This utility model adopts a double sealing structure with sealing ball one and sealing ball two coaxially rotatably connected. When sealing ball two, which serves as the main seal, leaks due to wear, the backup sealing system can be activated immediately, and emergency flow control can be achieved by rotating sealing ball one. This design constitutes two lines of sealing defense, improving the safety and reliability of the valve in critical pipelines and effectively avoiding the risk of the entire system going out of control due to single-point seal failure.

[0014] 2. This utility model, through its extended structure, enables the valve to have flexible installation adaptability. This structure, through the cooperation of a sliding connector, threaded rod, and clamping nut, allows for continuous adjustment of the overall connection length of the valve within a certain range. This design effectively solves the problem of variations caused by manufacturing errors in pipe spacing or thermal expansion and contraction, making valve installation more convenient, reducing the stringent requirements for pipe prefabrication precision, and significantly improving the convenience and fault tolerance of engineering applications.

[0015] 3. This utility model integrates double sealing and adjustable extension structure height into a single valve body, resulting in a compact structure and complete functionality. It also solves the installation spacing problem without adding an additional compensation section. This controls manufacturing costs and achieves a balance between safety, adaptability, and economy. Attached Figure Description Figure 1This is a schematic diagram of the front structure of a natural gas pipeline shut-off valve according to the present invention; Figure 2 This is a cross-sectional view of the valve seat and the fixing ring in this utility model. Figure 3 This is a cross-sectional view of the sealing ball in this utility model. Figure 4 This is a schematic diagram of the rotating handle and the limiting pin in this utility model; Figure 5 This is a schematic diagram of the sealing ring and extrusion ring in this utility model.

[0016] In the diagram: 1. Valve seat; 2. Sealing gasket one; 3. Retaining ring; 4. Sealing gasket two; 5. Sealing ball one; 6. Rotating column; 7. Sealing ring; 8. Compression nut; 9. Rotating handle; 10. Connecting nut; 11. Sealing ball two; 12. Fixing block; 13. Limit pin; 14. Connecting piece; 15. Threaded rod; 16. Connecting plate; 17. Compression nut; 18. Sealing ring; 19. Compression ring. Detailed Implementation

[0017] 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.

[0018] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0019] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0020] Please see Figures 1-5A natural gas pipeline shut-off valve includes a valve seat 1, a sealing gasket 2 installed inside the valve seat 1, a fixing ring 3 fixedly connected inside the valve seat 1, a second sealing gasket 4 fixedly connected to the fixing ring 3, a sealing ball 5 rotatably connected between the second sealing gasket 4 and the first sealing gasket 2, symmetrically distributed rotating columns 6 rotatably connected to the valve seat 1, a sealing ring 7 installed between the rotating columns 6 and the valve seat 1, and compression nuts 8 threadedly connected to both the upper and lower sides of the valve seat 1, with the rotating columns 6 passing through the compression nuts 8, and a rotating handle 9 inserted into the rotating columns 6. The valve seat 1 is connected by a connecting nut 10, and a second sealing ball 11 is rotatably connected inside the first sealing ball 5. The valve seat 1 is provided with an extension structure; one rotating column 6 is fixedly connected to the first sealing ball, and the other rotating column 6 passes through the first sealing ball 5 and is fixedly connected to the second sealing ball 11; the second sealing ball 11 and the first sealing ball 5 are rotatably connected and sealed; the middle through hole of the first sealing ball 5 and the second sealing ball 11 is in a connected state; the upper rotating handle 9 and the valve seat 1 are both fixedly connected to a fixing block 12, and a limit pin 13 is inserted between the two fixing blocks 12.

[0021] The working principle of this novel invention is as follows: Install valve seat 1 on the natural gas pipeline, and then rotate the lower rotating handle 9. The rotating handle 9 drives the sealing ball 11 to rotate 90° through the lower rotating column 6, so that the through hole of sealing ball 5 and sealing ball 11 is connected. At this time, natural gas flows through the through hole of sealing ball 11. During the above process, the limiting pin 13 limits the position of the upper rotating handle 9, and the upper rotating column 6 will not rotate.

[0022] However, when leakage occurs between sealing ball 11 and sealing ball 11, sealing ball 11 cannot cut off the flow of natural gas. At this time, the limit pin 13 is removed from the fixing block 12, and then the upper rotating handle 9 is rotated, which in turn drives the sealing ball 5 to rotate 90° through the upper rotating column 6. The sealing ball 5 cooperates with the sealing gasket 2 and sealing gasket 4 to seal the valve seat 1, thereby ensuring the stability of the use of this shut-off valve.

[0023] Please see Figure 1 , Figure 3 and Figure 5 The extended structure includes a connector 14, which is slidably connected to the valve seat 1. Two threaded rods 15 are fixedly connected to the connector 14, and two connecting plates 16 are fixedly connected to the valve seat 1. The threaded rods 15 pass through the connecting plates 16 and are threadedly connected to a compression nut 17. A sealing ring 18 is sleeved between the connector 14 and the valve seat 1, and a compression ring 19 is threadedly connected to the valve seat 1, which abuts against the sealing ring 18.

[0024] The working principle of this utility model: When installing valve seat 1 to the natural gas pipeline, first measure the gap between the two pipelines, then rotate the clamping nut 17, and then move the connector 14 outward. The width between the connector 14 and valve seat 1 should match the distance between the two pipelines. Then rotate the clamping nut 17 to make it fit against the connecting plate 16, and then rotate the compression ring 19. The compression ring 19 compresses the sealing ring 18, deforming the sealing ring 18 and sealing the connection between the connector and valve seat 1.

[0025] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A natural gas pipeline shut-off valve, comprising a valve seat (1), characterized in that: A sealing gasket 1 (2) is installed inside the valve seat (1). A fixing ring (3) is fixed inside the valve seat (1). A sealing gasket 2 (4) is fixed inside the fixing ring (3). A sealing ball 1 (5) is rotatably connected between the sealing gasket 2 (4) and the sealing gasket 1 (2). A symmetrically distributed rotating column (6) is rotatably connected to the valve seat (1). A sealing ring (7) is installed between the rotating column (6) and the valve seat (1). A compression nut (8) is threaded on both the upper and lower sides of the valve seat (1). The rotating column (6) passes through the compression nut (8). A rotating handle (9) is inserted into the rotating column (6). A connecting nut (10) is threaded on the rotating column (6). A sealing ball 2 (11) is rotatably connected inside the sealing ball 1 (5). The valve seat (1) is provided with an extension structure.

2. A natural gas pipeline shut-off valve according to claim 1, characterized in that: one of the valves... The rotating column (6) is fixedly connected to the first sealing ball, and the other rotating column (6) passes through the first sealing ball (5) and is fixedly connected to the second sealing ball (11).

3. A natural gas pipeline shut-off valve according to claim 2, characterized in that: The second sealing ball (11) is rotatably connected to the first sealing ball (5) and is sealed in a fitting manner.

4. A natural gas pipeline shut-off valve according to claim 3, characterized in that: The intermediate through holes of the first sealing ball (5) and the second sealing ball (11) are in a connected state.

5. A natural gas pipeline shut-off valve according to claim 4, characterized in that: the upper rotating handle (9) and the valve seat (1) are both fixedly connected to a fixing block (12), and a limit pin (13) is inserted between the two fixing blocks (12).

6. A natural gas pipeline shut-off valve according to claim 5, characterized in that: The extension structure includes a connector (14), which is slidably connected to the valve seat (1). The connector (14) is fixedly connected to two threaded rods (15), and the valve seat is fixedly connected to two connecting plates (16).

7. A natural gas pipeline shut-off valve according to claim 6, characterized in that: The threaded rod (15) passes through the connecting plate (16), and the threaded rod (15) is threadedly connected to a clamping nut (17).

8. A natural gas pipeline shut-off valve according to claim 7, characterized in that: A sealing ring (18) is fitted between the connector (14) and the valve seat (1), and a compression ring (19) is threaded onto the valve seat (1), with the compression ring (19) abutting against the sealing ring (18).

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