Pneumatic welding anti-mixing butterfly valve

Abstract

The utility model discloses a pneumatic welding mixing-preventing butterfly valve which comprises a pneumatic actuator, an air cylinder is fixedly arranged below the pneumatic actuator, a valve body is fixedly installed below the air cylinder, welding ports are fixedly formed in the two ends of the valve body respectively, an annular valve seat is arranged in the valve body, a valve plate is rotatably installed in the annular valve seat, and the valve plate is fixedly installed on the valve body. A first sealing filler is arranged between the flange of the outer wall of the valve plate and the annular valve seat, a valve rod is fixedly installed in the valve plate, one end of the valve rod penetrates through the interior of the valve body, the extending end of the valve rod is connected to the interior of an air cylinder, a piston barrel is slidably arranged in the air cylinder, and the outer wall of the piston barrel is sleeved with a spring; a sealing ring is arranged between the valve body and the valve rod, a second sealing filler is arranged above the sealing ring, the valve rod penetrates through the valve body and the valve plate, the valve plate is of a double-eccentric structure design, different media can be effectively prevented from being mixed, and the sealing performance of the valve plate is improved.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a pneumatically welded anti-mixing butterfly valve. Background Technology

[0002] In industrial production processes such as chemical, pharmaceutical, and food processing, it is often necessary to transport and control various fluids with different properties, and to prevent mixing between different fluids to avoid affecting product quality, triggering chemical reactions, or even causing safety accidents.

[0003] Traditional butterfly valves have some shortcomings in use. Their sealing performance is limited, and wear can easily occur between the valve plate and the valve seat during long-term use, leading to seal failure and leakage and mixing of different fluids, which affects the stability of the butterfly valve. To address these issues, a pneumatically welded anti-mixing butterfly valve has been proposed for improvement and upgrading. Utility Model Content

[0004] The purpose of this utility model is to provide a pneumatically welded anti-mixing butterfly valve to solve the problems mentioned in the background art.

[0005] To solve the above problems, the following technical solution is provided: a pneumatic welding anti-mixing butterfly valve, including a pneumatic actuator, a cylinder fixedly installed below the pneumatic actuator, a valve body fixedly installed below the cylinder, welding ports fixedly installed at both ends of the valve body, an annular valve seat provided inside the valve body, a valve plate rotatably installed inside the annular valve seat, a first sealing packing provided between the flange of the outer wall of the valve plate and the annular valve seat, a valve stem fixedly installed inside the valve plate, one end of the valve stem passing through the inside of the valve body and the extended end connected to the inside of the cylinder, a piston cylinder slidably installed inside the cylinder, a spring sleeved on the outer wall of the piston cylinder, a sealing ring provided between the valve body and the valve stem, and a second sealing packing provided above the sealing ring.

[0006] As a preferred embodiment of the above technical solution, the valve stem passes through the valve body and the valve plate, the valve plate adopts a double eccentric structure design, the first sealing packing is made of materials such as polytetrafluoroethylene, and the valve plate is adapted to the annular valve seat.

[0007] As a preferred embodiment of the above technical solution, the valve body is provided with a sealing groove inside the cylinder below it, the sealing ring is fixedly installed inside the sealing groove, the second sealing filler is made of flexible graphite material, and the valve stem and valve body are matched in position.

[0008] As a preferred embodiment of the above technical solution, one end of the spring is located at the bottom of the cylinder and the other end is connected to the piston cylinder. Guide rods are symmetrically arranged at the upper end of the piston cylinder, and guide grooves are opened inside the piston cylinder.

[0009] As a preferred embodiment of the above technical solution, a limiting rod is fixedly installed on the outer wall of the valve stem and the limiting rod is slidably connected inside the guide groove, and a sliding sleeve is fixedly installed inside the valve body at the sliding connection of the valve stem.

[0010] As a preferred embodiment of the above technical solution, the valve body has symmetrically arranged joints on its outer wall, and the outer wall of the joints is threaded with nuts.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] 1. This utility model device includes a valve plate, a first sealing packing, a second sealing packing, a sealing ring, and a valve stem. By adopting a double eccentric structure for the valve plate, the valve first disengages from the annular valve seat before rotating when opening, reducing friction and wear. When closed, the sealing flange on the edge of the valve plate fits tightly with the precision-machined valve seat, and the polytetrafluoroethylene material on the outer side of the valve plate achieves an effective seal, preventing fluid leakage and mixing. The valve stem uses flexible graphite material and works with the sealing ring to prevent fluid leakage from the valve stem, further ensuring the anti-mixing effect. The tight fit between the valve plate and the valve seat, as well as the excellent performance of the sealing components, ensures that the valve maintains a reliable seal during long-term use, reducing the possibility of fluid leakage.

[0013] Meanwhile, the valve body adopts an integrated welded structure with welding ports at both ends for welding connection with pipelines. This welding method can ensure a seamless connection between the valve body and the pipeline, preventing fluid leakage from the connection point, while improving the overall strength and pressure resistance of the valve. The valve body is equipped with an annular valve seat, and the inner surface of the valve seat is precision machined to have a high degree of smoothness and flatness.

[0014] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and scope of the appended claims, the embodiments of the present invention include many changes, modifications, and equivalents. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0016] Figure 1 This is a schematic diagram of the overall structure of a pneumatic welding anti-mixing butterfly valve according to the present invention;

[0017] Figure 2 This is a cross-sectional structural diagram of a pneumatically welded anti-mixing butterfly valve according to the present invention;

[0018] Figure 3for Figure 2 Schematic diagram of partial split structure;

[0019] Figure 4 for Figure 3 A schematic diagram of the partially split structure.

[0020] In the diagram: 1. Pneumatic actuator; 2. Cylinder; 3. Valve body; 4. Connector; 5. Nut; 6. Welding port; 7. Valve stem; 71. Limit rod; 8. Piston cylinder; 9. Spring; 10. Sliding sleeve; 11. Valve plate; 12. First sealing packing; 13. Sealing ring; 14. Second sealing packing; 15. Sealing groove. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] like Figures 1 to 4 As shown in the figure, this embodiment provides a pneumatic welding anti-mixing butterfly valve, including a pneumatic actuator 1, a cylinder 2 fixedly installed below the pneumatic actuator 1, a valve body 3 fixedly installed below the cylinder 2, welding ports 6 fixedly installed at both ends of the valve body 3, an annular valve seat provided inside the valve body 3, a valve plate 11 rotatably installed inside the annular valve seat, a first sealing packing 12 provided between the flange of the outer wall of the valve plate 11 and the annular valve seat, a valve stem 7 fixedly installed inside the valve plate 11, one end of the valve stem 7 passing through the inside of the valve body 3 and the extended end connected to the inside of the cylinder 2, a piston cylinder 8 slidably provided inside the cylinder 2, a spring 9 sleeved on the outer wall of the piston cylinder 8, a sealing ring 13 provided between the valve body 3 and the valve stem 7, and a second sealing packing 14 provided above the sealing ring 13.

[0023] like Figures 3 to 4 As shown, the valve stem 7 passes through the valve body 3 and the valve plate 11. The valve plate 11 adopts a double eccentric structure design. The first sealing packing 12 is made of polytetrafluoroethylene and other materials. The valve plate 11 is adapted to the annular valve seat. The valve body 3 is located below the cylinder 2 and has a sealing groove 15 inside. The sealing ring 13 is fixedly installed inside the sealing groove 15. The second sealing packing 14 is made of flexible graphite material. The valve stem 7 and the valve body 3 are adapted to each other. One end of the spring 9 is set at the bottom of the cylinder 2 and the other end is connected to the piston cylinder 8. Guide rods are symmetrically arranged at the upper end of the piston cylinder 8. Guide grooves are opened inside the piston cylinder 8.

[0024] The first sealing packing 12, made of high-performance polytetrafluoroethylene and other materials, is installed on the sealing flange of the valve plate 11. It possesses good elasticity, wear resistance, and corrosion resistance, forming a reliable seal between the valve plate 11 and the valve seat. The second sealing packing 14, made of flexible graphite, is located at the connection between the valve body 3 and the valve stem 7. It has good self-lubricating properties, reducing friction on the valve stem 7, and is highly flexible, adapting to frequent rotation of the valve stem 7. This prevents fluid leakage from the valve stem 7, ensuring the valve's sealing and anti-mixing effects. Furthermore, the valve stem 7 is made of high-strength alloy steel with a wear-resistant surface treatment, capable of withstanding significant torque and pressure. This ensures that under the drive of the pneumatic actuator 1, the valve stem 7 can stably and reliably rotate the valve plate 11. The pneumatic actuator 1 includes components such as a cylinder 2, piston cylinder 8, guide rod, and spring 9.

[0025] A limiting rod 71 is fixedly installed on the outer wall of the valve stem 7 and the limiting rod 71 is slidably connected inside the guide groove. A sliding sleeve 10 is fixedly installed inside the valve body 3 at the sliding connection of the valve stem 7. A connector 4 is symmetrically arranged on the outer wall of the valve body 3 and a nut 5 is threadedly connected to the outer wall of the connector 4.

[0026] By setting the sliding sleeve 10, the valve stem 7 and valve body 3 are relatively stable when rotating. The cylinder 2 is provided with a piston cylinder 8, which divides the inside of the cylinder 2 into two air chambers. When compressed air is introduced into one of the air chambers, the piston cylinder 8 moves under the action of air pressure. By using the limit rod 71 to slide on the guide groove, it causes the valve stem 7 to rotate, thereby realizing the opening or closing of the valve plate 11.

[0027] The working principle and process of this utility model are as follows: First, clean the welded port 6 of the pipeline to remove oil, rust, and other impurities, ensuring the port is smooth and clean. Place the valve in the installation position, ensuring that the welded ports 6 on both sides of the valve body 3 are precisely aligned with the pipeline port. Weld using appropriate processes such as argon arc welding. After the pipeline and welded port 6 are sealed, the piston cylinder 8 inside the cylinder 2 of the pneumatic actuator 1 divides the air chambers within the cylinder 2. When compressed air is introduced into one of the air chambers, the piston cylinder 8 moves under air pressure, compressing the spring 9. This, in turn, causes the limit rod 71 to move within the guide groove of the valve stem 7, thereby rotating the valve stem 7 and controlling the opening, closing, or adjustment of the valve plate 11. By precisely controlling the compressed air pressure and on / off time, the opening degree of the valve plate 11 can be accurately adjusted, thereby achieving flexible control of fluid flow. At the same time, the valve body 3 adopts an integrated welded structure, forming a seamless connection with the pipeline after welding, eliminating leakage problems at the connection. The valve plate 11 adopts a double eccentric structure, which first disengages from the annular valve seat before rotating when the valve is opened, reducing friction and wear. When closed, the sealing flange on the edge of the valve plate 11 fits tightly with the precision-machined valve seat, and together with the polytetrafluoroethylene material on the outside of the valve plate 11, it achieves effective sealing and prevents fluid leakage and mixing. The valve stem 7 is made of flexible graphite material and works with the sealing ring 13 to prevent fluid leakage from the valve stem 7, further ensuring the anti-mixing effect.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

Claims

1. A pneumatically welded anti-mixing butterfly valve, characterized in that, The device includes a pneumatic actuator (1), a cylinder (2) fixedly installed below the pneumatic actuator (1), a valve body (3) fixedly installed below the cylinder (2), welding ports (6) fixedly installed at both ends of the valve body (3), an annular valve seat is provided inside the valve body (3), a valve plate (11) is rotatably installed inside the annular valve seat, a first sealing packing (12) is provided between the flange of the outer wall of the valve plate (11) and the annular valve seat, a valve stem (7) is fixedly installed inside the valve plate (11), one end of the valve stem (7) passes through the inside of the valve body (3) and the extended end is connected to the inside of the cylinder (2), a piston cylinder (8) is slidably provided inside the cylinder (2), a spring (9) is sleeved on the outer wall of the piston cylinder (8), a sealing ring (13) is provided between the valve body (3) and the valve stem (7), and a second sealing packing (14) is provided above the sealing ring (13).

2. The pneumatically welded anti-mixing butterfly valve according to claim 1, characterized in that, The valve stem (7) passes through the valve body (3) and the valve plate (11). The valve plate (11) adopts a double eccentric structure design. The first sealing packing (12) is made of polytetrafluoroethylene material. The valve plate (11) is adapted to the annular valve seat.

3. A pneumatically welded anti-mixing butterfly valve according to claim 2, characterized in that, The valve body (3) is located below the cylinder (2) and has a sealing groove (15) inside. The sealing ring (13) is fixedly installed inside the sealing groove (15). The second sealing filler (14) is made of flexible graphite material. The valve stem (7) and the valve body (3) are matched in position.

4. A pneumatically welded anti-mixing butterfly valve according to claim 1, characterized in that, One end of the spring (9) is located at the bottom of the cylinder (2) and the other end is connected to the piston cylinder (8). Guide rods are symmetrically arranged on the upper end of the piston cylinder (8), and guide grooves are opened inside the piston cylinder (8).

5. A pneumatically welded anti-mixing butterfly valve according to claim 4, characterized in that, The valve stem (7) has a limit rod (71) fixedly installed on its outer wall and the limit rod (71) is slidably connected inside the guide groove. The valve body (3) has a sliding sleeve (10) fixedly installed inside the valve stem (7) at the sliding connection point.

6. A pneumatically welded anti-mixing butterfly valve according to claim 1, characterized in that, The valve body (3) has symmetrically arranged connectors (4) on its outer wall, and the outer wall of the connectors (4) is threaded with nuts (5).

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