ball valve

Abstract

The invention relates to a ball valve. The ball valve comprises a fixing apparatus and a valve seat, wherein the fixing apparatus is arranged between a valve body and a ball body; the fixing apparatus is connected with the valve body in a sealing manner through a first sealing material; the valve seat is positioned between the fixing apparatus and the ball body; the valve set is connected with the ball body in a sealing manner; the valve seat is connected with the fixing apparatus in a sealing manner through a second sealing material; a limiting part is arranged between the fixing apparatus and the valve body and used for limiting axial movement of the fixing apparatus; and an elastic part is also arranged between the fixing apparatus and the valve seat and used for applying axial elastic force and pressing the valve seat to the ball body. As the elastic part is positioned between the fixing apparatus and the valve seat, the sealing between the valve seat and the ball body is realized through the second sealing material by only pushing the valve seat to the ball body due to the axial elastic force of the elastic part after the fixing apparatus is limited by the limiting part between the fixing apparatus and the valve body, so that the elastic part is low in performance requirement in assembly and disassembly processes; and meanwhile, the fixing apparatus in the valve body is connected with the valve body in a sealing manner through the second sealing material, so that the sealing effect of the ball valve is guaranteed.

Description

technical field [0001] The invention relates to the field of valve manufacturing, in particular to a ball valve. Background technique [0002] Ball valve has become one of the most widely used valves due to its reliable sealing, simple structure and convenient maintenance. Among the ball valves, the top entry ball valve has the advantages of less external leakage points, no influence of pipeline stress on the middle flange, and online maintenance, etc., and is widely used. [0003] When assembling the existing top-entry ball valve, the retainers on both sides of the valve ball are usually slid along the inner wall of the valve to leave a space for the valve ball to be put in, and then the valve ball is installed. The disassembly process is opposite to the assembly process. For large-diameter ball valves, due to the large volume of the valve ball and the retainer, it is difficult to disassemble the ball valve. For example, the Chinese patent document CN202402694U discloses ...

AI Technical Summary

Problems solved by technology

[0006] For this reason, the technical problem to be solved by the present invention is that the unreasonable structural design of the existing high-temperature top-entry ball valve causes the moving distance of the sealing ring of the valve seat to the valve body and the sphere to be too long, which eventually leads to the inability to realize the gap between the valve seat and the sphere. Sealing; the invention shortens the moving distance of the sealing ring of the valve seat by rationally designing the structure of the valve seat, and realizes the reliable sealing performance of the ball valve

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