Floating spherical crown dredge type metal sealing ball valve

Abstract

The invention relates to a floating spherical crown dredge type metal sealing ball valve. The floating spherical crown dredge type metal sealing ball valve comprises a valve body, a valve seat, a ball body and a valve rod, and is mainly characterized in that the two sides of a through hole of the ball body are each provided with one plane; round holes perpendicular to the through hole of the ball body are formed in the centers of the planes on the two sides of the ball body and are each internally provided with one ball clack; the ball clacks are connected with the round holes in the ball body through round convex columns in a movable fit mode; positioning rings are installed at the upper and lower ends of the connection position, between the ball body and each ball clack, of the ball surface; the positioning rings and the valve rod are concentric; an annular spring cavity is manufactured in the position, between each ball clack plane and the ball body plane, of the outer side of the corresponding round convex column in the radial direction; a spring is installed in each annular spring cavity; an annular anti-blocking groove is manufactured in the position, between each ball clack plane and the ball body plane, of the outer side of the corresponding annular spring cavity; medium dredge channels are manufactured in the ball body plane inside each annular spring cavity close to the external circular surface of the corresponding round convex column and are communicated with one another, and the two ends of the medium dredge channels are communicated with the external ball surface of the ball body. The ball clacks float reliably and are good in temperature resistance performance and suitable for high temperature and ultralow temperature working medium conditions.

Description

technical field [0001] The invention belongs to the field of valves, in particular to a metal hard-sealed ball valve. The invention is suitable for high temperature, low temperature, high pressure and high abrasion working conditions of granular media. Background technique [0002] High-temperature hard-sealed ball valves are often used in high-temperature and high-wear media conditions. In order to prevent the valve seat and the ball from being stuck due to high-temperature expansion, floating valve seats are generally used to absorb the high-temperature expansion between the two, but the radial direction of the valve seat and the valve The spring cavity between the round walls in the body is easy to enter the medium particles and block it, so that the valve seat loses its floating function. For this reason, preventing the spring cavity from entering the medium becomes the key to product structure design and product performance assurance. For example, the scraper-type two...

AI Technical Summary

Problems solved by technology

However, when the sealing device expands at high temperature, the space between the floating valve seat and the valve body will also expand radially to death, and the valve seat at the other end of the spring chamber and the valve body is sealed with a graphite sealing ring, and when the floating valve seat moves During the project, the radial wear of the graphite sealing ring will cause the medium particles to enter the spring cavity, causing the floating valve seat to lose its floating function, causing the ball and the valve seat to swell at high temperature or stuck at ultra-low temperature

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