High-performance butterfly valve

Abstract

The invention relates to a high-performance butterfly valve. The high-performance butterfly valve comprises a valve body, a valve seat, a butterfly plate and a valve rod; the butterfly plate is provided with a conical metal sealing face; primarily, the valve seat is a flexible self-sealing valve seat which is composed of an arc metal sealing ring, and the arc metal sealing ring is embedded in theinner wall of a valve body channel, the left end of the arc metal sealing ring is provided with a left arc face, and the right end of the arc metal sealing ring is provided with a right arc face; theleft arc face abuts against the right-angle position between the inner wall of the valve body channel and a first radial step, and the right arc face abuts against an axial pressing device; a reinforcing ring is installed in an arc cavity formed by the arc metal sealing ring and the inner wall of the valve body channel; a positioning spring is arranged on the face, in contact with the inner wall of the valve body channel, of the reinforcing ring; and the side, facing the arc metal sealing ring, of the reinforcing ring is provided with an arc face. Thermal expansion and cold shrinkage caused byabrasion to a sealing surface and temperature change are automatically compensated through elastic energy storage and deformation of the arc metal sealing ring. The high-performance butterfly valve has the characteristics of reliable sealing performance, long product service life, high-temperature resistance, abrasion resistance and the like.

Description

technical field [0001] The invention belongs to the field of valves, in particular to a hard-sealed butterfly valve. The invention is suitable for working conditions of high temperature and abrasive media. Background technique [0002] Butterfly valves have the characteristics of simple structure, convenient opening and closing, and low manufacturing cost, and are widely used in medium conveying pipeline systems in various industries of the national economy. Triple eccentric butterfly valve is currently the most common structural design of butterfly valve due to its high sealing specific pressure. Its structure includes valve body, valve seat, butterfly plate and valve stem. In the high temperature and abrasive medium conveying pipeline, the butterfly valve is required to have high temperature resistance and wear resistance, and the butterfly plate and the valve seat are generally fitted with hard seals. At present, the seat sealing surface of hard-sealed butterfly valves ...

AI Technical Summary

Problems solved by technology

At present, the seat sealing surface of hard-sealed butterfly valves is generally directly processed in the valve body channel. Since the seat sealing surface is an oblique cone structure, the processing technology is relatively complicated, and both the seat sealing surface and the butterfly plate sealing surface are processed. There is always a matching error between the sealing surfaces after the two cooperate with each other, resulting in poor sealing performance of the existing hard-sealed butterfly valve

Moreover, during use, friction occurs between the sealing surface of the valve seat and the sealing surface of the butterfly plate, causing irreversible wear on the sealing surface, resulting in a decrease in the sealing performance of the sealing pair and a short service life of the product

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