Top-mounted ball valve

Abstract

The invention relates to a top-mounted ball valve, comprising a valve body, a valve ball, a valve seat component, a valve cover component and a valve shaft component, wherein the valve seat component includes a valve seat with a shoulder, which is installed between the valve ball and the valve body; a spring pressing sleeve and a hinged separation sleeve which are sleeved on the valve seat. The separation sleeve is installed between the valve seat shoulder and the spring pressing sleeve and the width of the separation sleeve is at least equal to that of the valve ball part extended to the valve seat. A pressure spring is arranged between the spring pressing sleeve and the valve body; the valve body is provided with a cavity installed with the valve seat; the cooperated part of the valve seat and the valve body is provided with a sealing piece. The ball valve is easy to detach and maintain by means of a hinged separation sleeve between the valve seat shoulder and the spring pressing sleeve; the compression of the pressure spring during the detachment is also reduced; under proper valve seat seal pressure, the bigger rigidity of pressure spring can be used so as to increase the stability of the valve seat. The invention has few parts to be sealed and also has low requirement on the processing and mounting precision.

Description

technical field [0001] The invention relates to a ball valve, in particular to a top-mounted ball valve which is easy to disassemble and maintain. Background technique [0002] At present, the commonly used ball valves mainly include three types: side-entry type, top-entry type and fully welded type. Among them, compared with the other two types, the top-entry ball valve has the characteristics of high strength and online maintenance, so it is widely used in high-end technical fields. However, the existing top-mounted ball valve generally has the following problems during assembly and maintenance: (1) For the top-mounted ball valve with a direct spring-loaded seat structure, it is necessary to overcome the pressure of the spring to push the valve seat away during assembly. Only when the valve ball can be installed in the valve body, the compression of the spring is large, and the stability of the valve seat is poor under working conditions; and during maintenance, since the...

AI Technical Summary

Problems solved by technology

However, the existing top-mounted ball valve generally has the following problems during assembly and maintenance: (1) For the top-mounted ball valve with a direct spring-loaded seat structure, it is necessary to overcome the pressure of the spring to push the valve seat away during assembly. Only when the valve ball can be installed in the valve body, the compression of the spring is large, and the stability of the valve seat is poor under working conditions; and during maintenance, since the valve is installed on the pipeline, it is laborious to push the valve seat away, and it is difficult to achieve online maintenance. Maintenance; (2) For the structure that uses a circlip to load the valve seat spring, the circlip needs to be assembled in the circlip groove during assembly. Although it can solve the problem of online maintenance and stability, it is also very difficult in assembly and maintenance

The above-mentioned patent solves the problem of online maintenance, but requires more sealing parts, which is prone to leakage, and also requires higher precision for installation and processing

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