Double-eccentricity all-metal seal butterfly valve

Abstract

A double-eccentricity all-metal seal butterfly valve comprises a valve body, a valve plate, a valve shaft, a disc spring type metal valve seat, an O-shaped elastic metal ring and a gland. The valve body and the valve plate are arranged in an eccentric manner, the disc spring type metal valve seat is fixed to the valve body through the gland, and the O-shaped elastic metal ring is arranged between the disc spring type metal valve seat and the valve body. The disc spring type metal valve seat is adopted in the double-eccentricity all-metal seal butterfly valve, the extending length within unit size is increased, so that elastic deformation of the valve seat during work is increased, and plastic deformation of the valve seat is reduced. Meanwhile when the valve works in the reverse direction, the O-shaped elastic metal ring can absorb part of deformation of the valve seat caused by medium pressure, so that the service life of the valve is greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a double-eccentric all-metal sealing butterfly valve suitable for high-temperature, high-pressure, and strongly corrosive liquid medium delivery pipelines. Background technique [0002] Double eccentric butterfly valves are also called high-performance butterfly valves. They are mainly used for water drainage in water plants, power plants, steel smelting, chemical engineering, water source engineering, and environmental facility construction. They are especially suitable for water pipelines as regulating and intercepting equipment. Compared with the centerline butterfly valve, the double eccentric butterfly valve is more resistant to high pressure, has a longer life and good stability. Compared with other valves, the larger the caliber, the lighter the material, and the lower the cost. However, due to the limitation of its material, its application in the field of high temperatur...

AI Technical Summary

Problems solved by technology

However, due to the limitation of its material, the application in the field of high temperature, high pressure and strong corrosive liquid medium transportation is greatly restricted.

[0003] In the past, metal seal butterfly valves usually used in the field of high temperature, high pressure, and strong corrosive liquid medium transportation are mostly triple-eccentric design, and the cost in design, processing, assembly and other aspects is very high; the valve seat is designed as multi-layer metal sheets, and each layer uses The transportation of high temperature, high pressure and strong corrosive liquids can only be realized by using non-metallic materials as intervals, and due to the complicated design of the triple eccentricity, once a leak occurs, it must be repaired by professionals, the maintenance cost is high, and the production cost of the triple eccentric butterfly valve is expensive. higher cost

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