Top-mounted ball valve

Abstract

The invention relates to a top-mounted ball valve which comprises a valve seat between a ball body and a valve body, and a spring assembly between the valve body and the valve seat, wherein the valve seat is hermetically connected with the ball body through a sealing material and hermetically connected with the valve body through a sealing piece; one end of the spring assembly abuts on the valve body; a first step is formed in the valve body; the sealing piece is arranged in a sealing gap formed by the shoulder of the first step and the radial end surface of the spring assembly; one end of the sealing piece abuts to the shoulder of the first step, and the other end of the sealing piece abuts on the radial end surface of the spring assembly, so that the sealing piece cannot be moved; a limiting piece is arranged on the outer circumferential surface of the valve seat, the radial end surface of the limiting piece abuts with the other end of the spring assembly, and the limiting piece is used for limiting the spring assembly.

Description

Technical field [0001] The invention relates to the technical field of valve manufacturing, in particular to a top-mounted ball valve. Background technique [0002] The ball valve has become one of the more widely used valves due to its reliable sealing, simple structure and convenient maintenance. Compared with side-mounted ball valves, top-mounted ball valves have the advantages of fewer leakage points and less impact on the pipeline stress. At the same time, top-mounted ball valves are widely used because they can realize convenient online maintenance. In the top-mounted ball valve, DBB and DIB are two types of valve seat functions. Among them, the DBB valve seat is also called the single piston effect valve seat. Each valve seat can resist the force in one direction and can discharge the middle cavity. DIB valve seat is divided into DIB-1 valve seat and DIB-2 valve seat. Each valve seat of DIB-1 valve seat resists the force in two directions, which is called double-piston ...

AI Technical Summary

Problems solved by technology

[0006] For this reason, the technical problem to be solved by the present invention is that in the prior art, the ball valve capable of realizing bidirectional sealing has a short service life and poor sealing reliability due to the movement of the sealing element, while the valve seat assembly structure capable of realizing the fixed sealing element can only realize unidirectional sealing Therefore, by rationally designing the structure of the valve seat assembly, a ball valve that can prevent the seal from moving and achieve bidirectional reliable sealing can be provided.

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