Self-tightening seal ball valve

Abstract

The invention provides a self-tightening seal ball valve which comprises a valve body, a sphere, a valve seat and a valve rod, wherein the valve body comprises an upper valve part, a lower valve part, and a cavity in which the sphere is arranged, and the valve rod connected with the sphere in the cavity extends out of the valve body through a central through hole at the upper valve body; the ball valve also comprises floating bodies and compression rings; the numbers of the floating bodies and the compression rings are respectively two, and the floating bodies and the compression rings are respectively arranged on the left and right sides of the valve body; the compression rings are sleeved on the floating bodies and fixedly arranged on the valve body through nuts and studs, and the floating bodies are fixed connected to the valve body through the compression rings; and a middle-path seal ring is arranged in a groove between each floating body and the valve body, each compression ring is provided with a draw bolt, and the draw bolt passes through each compression ring from the outside of each compression ring and then is inserted into each floating body so as to tightly draw each floating body, thereby pre-tightening the middle-path seal ring between each floating body and the valve body. According to the self-tightening seal ball valve, the larger the outward traction forces exerted on the left and right floating bodies are, the more reliable the sealing is.

Description

technical field [0001] The invention relates to the field of ball valves, in particular to a self-tight sealing ball valve. Background technique [0002] The ball valve is evolved from the cock. Its opening and closing part is a sphere, and the sphere is rotated 90° around the axis of the valve stem to achieve the purpose of opening and closing. The ball valve is mainly used to cut off, distribute and change the flow direction of the medium on the pipeline. The ball valve not only has a simple structure and good sealing performance, but also has a small volume, light weight, less material consumption, and a small installation size within a certain nominal passage range. Moreover, the driving torque is small, the operation is simple, and it is easy to realize rapid opening and closing. The ball valve is one of the fastest-growing valve varieties in the past ten years. Especially in industrialized countries such as the United States, Japan, Germany, France, Italy, Spain, and ...

AI Technical Summary

Problems solved by technology

As a result, the middle of the valve is prone to leakage and other failures.

It has an immeasurable impact on the efficiency of the enterprise and the safety of personnel

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