Low-pressure air-tight sealing spherical valve clack lifting check valve with ball holding device

Abstract

The invention discloses a low-pressure air-tight sealing spherical valve clack lifting check valve with a ball holding device. The lifting check valve comprises a valve body, a valve deck, a gasket, a fastener, a spring and a spherical valve clack, wherein the sealing face of the valve body is an inclined face, a guide seat, the ball holding device and the spherical valve clack are arranged in an upper end opening of the valve body, a convex face positioning spigot is arranged on the lower end face of the guide seat, the convex face positioning spigot is in matched contact with a groove positioning rabbet formed in the upper end face of the ball holding device, a spherical face consistent with the spherical valve clack in diameter is arranged inside the ball holding device, an inner groove for containing the spherical valve clack is formed in the lower end face of the guide seat, and evenly-distributed drainage holes are formed in the side face of the guide seat. The low-pressure air-tight sealing spherical valve clack lifting check valve has the beneficial effect that the possibility of valve leakage caused by machining errors of two structures of plane sealing and conical surface sealing is avoided.

Description

technical field [0001] The invention relates to a low-pressure gas-sealed spherical disc lifting check valve with a ball valve. Background technique [0002] Lifting check valves are commonly used in modern process conditions as an important component to protect the manufactured equipment, and the process system mostly uses gas media, requiring the valve to be sealed at a back pressure of 0.6MPa, but the existing lift check valves are generally It adopts flat seal or cone seal. For the flat sealing structure, when the valve is to achieve low-pressure air sealing, extremely high requirements are placed on the flatness and roughness of the sealing surface, as well as the verticality of the sealing surface and the valve disc. Sealing; as for the conformity of the sealing surface of the conical sealing surface structure, the shape and position tolerance of the sealing surface and the valve disc can not achieve air sealing due to a little deviation due to processing. Contents ...

AI Technical Summary

Problems solved by technology

For the flat sealing structure, when the valve is to achieve low-pressure gas sealing, extremely high requirements are placed on the flatness, roughness of the sealing surface, and the verticality between the sealing surface and the valve disc. Sealing; as for the fit of the sealing surface of the conical sealing surface structure, the shape and position tolerance of the sealing surface and the valve disc can not be sealed due to a little deviation due to processing.

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