Natural gas long-distance pipeline reversing valve

Abstract

The utility model relates to the technical field of reversing valves, in particular to a natural gas long-distance pipeline reversing valve which comprises a valve body, a ball valve is arranged in an inner cavity of the valve body, a valve rod is integrally arranged on the top face of a ball valve body and vertically and upwards extends to the outer side of the valve body, and three communicated flanges A are integrally arranged on the side faces of the valve body respectively. A plurality of limiting blocks are uniformly arranged on the edge of a convex body of the flange A, the limiting blocks are matched with limiting grooves in the edge of the side face of the sealing gasket, and the limiting blocks and the limiting grooves are jointly used for positioning and installing the sealing gasket; the limiting block matched with the sealing gasket is arranged on the convex surface of the flange of the reversing valve, so that the sealing gasket is convenient to position and install, meanwhile, the sealing effect is good, and the sealing gasket is easy to separate from the flange during disassembly.

Description

Technical Field

[0001] This utility model relates to the field of directional valve technology, and in particular to a directional valve for long-distance natural gas pipelines. Background Technology

[0002] In long-distance natural gas pipeline systems, directional valves not only enable flexible switching of gas direction, but also improve system safety and operating efficiency.

[0003] In long-distance natural gas pipelines, the diverting valve is generally connected to the pipeline flange via the valve flange. During the connection, a gasket needs to be placed between the two to enhance the sealing. Metal gaskets are commonly used, but their installation requires high precision. The bolt preload must be precisely controlled during installation, otherwise it is easy to cause excessive crushing of the metal ring or insufficient sealing. Rubber gaskets are also used. Generally, the sides of rubber gaskets are flat, which not only makes them prone to misalignment during installation, resulting in poor sealing, but also makes them susceptible to adhesion to the contact surfaces of the flanges after long-term compression by the flanges on both sides, as well as the influence of environment and temperature, making the gasket difficult to remove.

[0004] Therefore, this application provides a reversing valve for long-distance natural gas pipelines to solve the problems mentioned in the background art. Summary of the Invention

[0005] The purpose of this utility model is to provide a reversing valve for long-distance natural gas pipelines, which solves the problems of easy misalignment and adhesion of existing switching valve gaskets.

[0006] To solve the above-mentioned technical problems, this utility model provides a reversing valve for a long-distance natural gas pipeline, including a valve body, a ball valve installed in the inner cavity of the valve body, a valve stem integrally installed on the top surface of the ball valve body, the valve stem extending vertically upward to the outside of the valve body, and three through flanges A integrally installed on the side of the valve body; a plurality of limiting blocks are evenly arranged on the convex edge of the flange A, the limiting blocks are adapted to the limiting grooves on the side edge of the sealing gasket, and the limiting blocks and limiting grooves are used together for the positioning and installation of the sealing gasket.

[0007] A further improvement of this utility model is that a ball valve is installed in the inner cavity of the valve body, and a T-shaped through channel is machined in the center of the ball valve. The T-shaped channel is connected to the inner cavity of flange A to form an air inlet, an air outlet and a side outlet.

[0008] A further improvement of this utility model is that the sealing gasket is ring-shaped, and several limiting grooves are evenly arranged on the two side edges of the sealing gasket body, and the limiting grooves are adapted to the limiting blocks on the flange A body.

[0009] A further improvement of this utility model is that several protrusions and indentations are arranged at intervals around the center of both sides of the sealing gasket body.

[0010] A further improvement of this utility model is that the thickness of the sealing gasket is 5~15mm.

[0011] A further improvement of this utility model is that the depth of the limiting groove is 2~6mm, and the width of the limiting groove is 1 / 5~1 / 4 of the width of the side of the sealing gasket.

[0012] A further improvement of this utility model is that the diameters of the air inlet, air outlet, and side outlet are equal, and the inner diameter of the sealing gasket is equal to the diameter of the air inlet.

[0013] A further improvement of this utility model is that the outer diameter of the sealing gasket is equal to the outer diameter of the convex top surface.

[0014] A further improvement of this utility model is that the sealing gasket is made of fluororubber.

[0015] A further improvement of this utility model is that flange A is adapted to flange B of a bolted gas pipeline.

[0016] By adopting the above technical solution, this utility model has the following beneficial effects:

[0017] 1. This utility model provides a natural gas long-distance pipeline reversing valve. The three-way ball valve has a limiting block set on the convex edge of the flange. The limiting block is adapted to the limiting groove of the sealing gasket, which facilitates better fitting and tight contact between the sealing gasket and the three-way valve flange during installation. This effectively prevents the sealing gasket from rotating or shifting during installation and improves the sealing effect.

[0018] 2. The present invention provides a reversing valve for a long-distance natural gas pipeline. The sealing gasket body is provided with protrusions and concaves. When disassembling, the sealing ring can automatically separate from the flange contact surface during the elastic deformation process of the protrusions, effectively preventing adhesion.

[0019] 3. The present invention provides a reversing valve for a long-distance natural gas pipeline. The protrusions and concaves on the side of the sealing gasket body allow the sealing ring to undergo elastic deformation under pressure, filling the external defects of the flanges on both sides and adapting to pressure and temperature changes. For natural gas containing particles, the protrusions and concaves can also reduce the embedding of impurities into the sealing surface and avoid scratching the sealing surface.

[0020] 4. The natural gas long-distance pipeline reversing valve provided by this utility model has a sealing gasket made of fluororubber, which can effectively resist the chemical corrosion caused by hydrogen sulfide in natural gas and has a long service life. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of a reversing valve for a long-distance natural gas pipeline.

[0023] Figure 2 for Figure 1 A cross-sectional view of the air inlet and outlet;

[0024] Figure 3 This is a diagram showing the effect after the reversing valve is connected to the gas pipeline.

[0025] Figure 4 Diagram showing the location relationships of the reversing valve, gasket, and gas pipeline;

[0026] Figure 5 This is an enlarged view of the convex surface of flange A;

[0027] Figure 6 This is a schematic diagram of the sealing gasket structure;

[0028] Figure 7 This is a schematic diagram of the ball valve and valve stem.

[0029] Reference numerals in the attached diagram: 1. Valve body; 11. Ball valve; 12. Valve stem; 21. Air inlet; 22. Air outlet; 23. Side outlet; 3. Flange A; 31. Raised face; 311. Limiting block; 4. Sealing gasket; 41. Limiting groove; 42. Raised dot; 43. Recessed dot; 5. Gas pipeline; 51. Flange B. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] The present invention will be further explained below with reference to specific embodiments.

[0034] like Figures 1-7 As shown, this embodiment provides a natural gas long-distance pipeline reversing valve, comprising a valve body 1, a ball valve 11 disposed within the valve body 1, a valve stem 12 integrally disposed on the top surface of the ball valve 11, the valve stem 12 extending vertically upward to the outside of the valve body 1, and three interconnected flanges A3 integrally disposed on the side of the valve body 1; a plurality of limiting blocks 311 are evenly disposed on the convex surface 31 of the flange A3, the limiting blocks 311 being adapted to the limiting grooves 41 on the side edge of the sealing gasket 4, the limiting blocks 311 and the limiting grooves 41 being used together for positioning and installing the sealing gasket 4, the limiting blocks 311 being able to be embedded in the limiting grooves 41, so that the sealing gasket 4 can be positioned and installed. Positioning and installation; specifically, valve body 1 is a three-way switching valve, valve core is ball valve 11, and a valve seat (not shown in the figure) is provided between ball valve 11 and the inner wall of valve body 1. Ball valve 11, valve stem 12 and valve seat are all commercial products, and their specific structures will not be described in detail here. The convex surface 31 of flange A3 and the limiting block 311 are integrally formed. The interior of valve body 1 is designed as a T-shaped flow channel. The three ports are connected to flange B51 of gas pipeline 5 through flange A3. When connecting, the limiting groove 41 of sealing gasket 4 is fitted and snapped into the limiting block 311 of flange A3, and then it is tightened and fixed to flange B51 of gas pipeline 5 with bolts.

[0035] like Figure 2 , Figure 7As shown, in this embodiment, a ball valve 11 is installed in the inner cavity of the valve body 1. A "T"-shaped through channel is machined in the center of the ball valve 11. The T-shaped channel is connected to the inner cavity of the flange A3 to form an air inlet 21, an air outlet 22, and a side outlet 23. Specifically, the air inlet 21 and the air outlet 22 are horizontally connected, and the direction of the side outlet 23 is perpendicular to the direction of the air inlet 21. It is connected to the spare gas pipeline 5. Under normal circumstances, the air inlet 21 and the air outlet 22 are connected. When maintenance of the air outlet pipeline is required, the ball valve 11 can be rotated 90° counterclockwise to close the air outlet 22, and at the same time, the side outlet 23 is opened and connected to the air inlet 21.

[0036] like Figures 4-6 As shown, in this embodiment, the sealing gasket 4 is ring-shaped, and several limiting grooves 41 are evenly arranged on both sides of the sealing gasket 4 body. The limiting grooves 41 are adapted to the limiting blocks 311 on the flange A3 body. Several protrusions 42 and concave points 43 are arranged at intervals around the center of both sides of the sealing gasket 4 body. Specifically, four limiting grooves 41 are evenly arranged on both sides of the sealing gasket 4 body. The limiting grooves 41 are crescent-shaped and are used to fit and engage with the limiting blocks 311 integrally formed with the edge of the flange A3 body, which facilitates the positioning and installation of the sealing gasket 4. The protrusions 42 are circular. The arc-shaped protrusion has a height of 0.5mm, and the concave point 43 is an arc-shaped groove with a depth of 0.5mm. During disassembly, the gasket 4 can automatically separate from the contact surfaces of flange A3 and flange B51 during the elastic deformation process of the protrusion 42, effectively preventing adhesion. The protrusion 42 and concave point 43 allow the gasket 4 to undergo elastic deformation under pressure, filling the external defects of the contact surfaces of flange A3 and flange B51, adapting to pressure and temperature changes. For natural gas containing particles, the protrusion 42 and concave point 43 can also reduce the embedding of impurities into the sealing surface and avoid scratching the sealing surface.

[0037] like Figures 4-6 As shown, in this embodiment, the sealing gasket 4 has a thickness of 5~15mm; the limiting groove 41 has a depth of 2~6mm, and the width of the limiting groove 41 is 1 / 5~1 / 4 of the width of the side of the sealing gasket 4; the diameters of the air inlet 21, the air outlet 22, and the side outlet 23 are equal, and the inner diameter of the sealing gasket 4 is equal to the diameter of the air inlet 21; the outer diameter of the sealing gasket 4 is equal to the outer diameter of the top surface of the convex surface 31; the sealing gasket 4 is made of fluororubber; specifically, the sealing gasket 4 is a corrosion-resistant fluororubber with a certain hardness and elasticity, the sealing gasket 4 has a thickness of 10mm, the limiting groove 41 has a depth of 4mm, and the corresponding limiting block 311 has a thickness of 4mm. The sealing gasket 4 matches the contact surfaces of flange A3 and flange B51, facilitating installation and sealing.

[0038] This utility model provides a working principle for a reversing valve for a long-distance natural gas pipeline: In use, the operator first fits a sealing gasket 4 with the limiting block 311 on the flange A3 at the inlet 21. Then, the flange B51 of the gas pipeline 5 is tightened with bolts. During tightening, the protrusions 42 and concave points 43 undergo elastic deformation under pressure, filling the external defects on the contact surfaces of flange A3 and flange B51, making the sealing gasket 4 fit more tightly with the contact surfaces of flange A3 and flange B51, resulting in a better sealing effect. Then, following the above operation, the flanges A3 at the outlet 22 and side outlet 23 are connected to the flange B51 of the gas pipeline 5 respectively. Finally, the ball valve 11 is rotated to connect the inlet 21 and outlet 22, and the side outlet 23 is closed. When maintenance of the outlet pipeline is required, simply rotate the ball valve 11 counterclockwise by 90° to close the outlet 22, while simultaneously opening the side outlet 23 and connecting it to the inlet 21.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A reversing valve for a long-distance natural gas pipeline, characterized in that, The valve body (1) includes a ball valve (11) installed inside the valve body (1). A valve stem (12) is integrally installed on the top surface of the ball valve (11). The valve stem (12) extends vertically upward to the outside of the valve body (1). Three through flanges A (3) are integrally installed on the side of the valve body (1). Several limiting blocks (311) are evenly arranged on the edge of the convex surface (31) of the flange A (3). The limiting blocks (311) are adapted to the limiting grooves (41) on the side edge of the sealing gasket (4). The limiting blocks (311) can be embedded in the limiting grooves (41) so that the sealing gasket (4) can be positioned and installed. The sealing gasket (4) is ring-shaped. Several limiting grooves (41) are evenly arranged on the two side edges of the sealing gasket (4). The limiting grooves (41) are adapted to the limiting blocks (311) on the flange A (3). Several protrusions (42) and concave points (43) are arranged at intervals in the middle of the two side surfaces of the sealing gasket (4).

2. The natural gas long-distance pipeline reversing valve according to claim 1, characterized in that, A ball valve (11) is installed in the inner cavity of the valve body (1). A T-shaped through channel is machined in the center of the ball valve (11). The T-shaped channel is connected to the inner cavity of the flange A (3) to form an air inlet (21), an air outlet (22), and a side outlet (23).

3. The natural gas long-distance pipeline reversing valve according to claim 1, characterized in that, The thickness of the sealing gasket (4) is 5~15mm.

4. The natural gas long-distance pipeline reversing valve according to claim 1, characterized in that, The depth of the limiting groove (41) is 2~6mm, and the width of the limiting groove (41) is 1 / 5~1 / 4 of the width of the side of the sealing gasket (4).

5. The natural gas long-distance pipeline reversing valve according to claim 2, characterized in that, The diameters of the air inlet (21), air outlet (22) and side outlet (23) are equal, and the inner diameter of the sealing gasket (4) is equal to the diameter of the air inlet (21).

6. The natural gas long-distance pipeline reversing valve according to claim 1, characterized in that, The outer diameter of the sealing gasket (4) is equal to the outer diameter of the top surface of the convex surface (31).

7. The natural gas long-distance pipeline reversing valve according to claim 6, characterized in that, The sealing gasket (4) is made of fluororubber.

8. The natural gas long-distance pipeline reversing valve according to claim 2, characterized in that, Flange A (3) is adapted to flange B (51) of the threaded gas pipeline (5).

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