Heat-resistant and wear-resistant metal seal ball valve

Abstract

The invention relates to a heat-resistant and wear-resistant metal-sealed ball valve, which includes a valve body, a valve seat, a sphere, and a valve stem; mainly, a plane is respectively formed on the sphere on both sides of the center line of the through hole of the sphere, and the circles of the planes on both sides of the sphere A ball petal is installed in each hole; an annular spring cavity and a spring in the cavity are formed in the sphere plane radially outside the circular protruding column of the ball petal; an annular anti-blocking groove is formed in the sphere plane outside the annular spring cavity. A medium dredging groove leading to the outer spherical surface of the ball and communicating with the annular anti-blocking groove is formed in the plane of the sphere near the spring cavity of the outer circular surface of the circular convex post; the valve seat is fixed and installed in the valve body channel by a positioning ring, and the positioning ring A concave spherical surface for positioning the ball disc is formed on the side of the valve cavity. Its ball valve floats reliably, has good temperature resistance and wear resistance, and is suitable for high temperature and high wear conditions of granular media.

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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