Bidirectional pressure high-temperature butterfly valve

Abstract

The invention relates to a bidirectional pressure high-temperature butterfly valve which comprises a valve body, a valve seat, a butterfly plate, and a valve rod. The valve body, the butterfly plate and the valve seat adopts the floating valve seat. The floating valve seat is composed of a fixed ring and a floating ring. The fixed ring is pressed on a radial step of a valve body outlet channel through a press ring and is in static seal fit with the valve body. The floating ring is movably installed on the radial step of the valve body outlet channel on the inner side of the fixed ring throughthe press ring. An axial gap is formed between the radial step of the floating ring and the radial step in the valve body outlet channel. An annular arc groove is formed in the position, at the junction of the fixed ring and the floating ring, in the radial plane on one side of the press ring. A metal sealing membrane matched with the annular arc groove is welded in the annular arc groove. The outer arc surface of the metal sealing membrane is welded in the annular arc groove in one side of the fixed ring in a sealed mode, and the inner arc surface of the metal sealing membrane is welded in the annular arc groove in one side of the floating ring in a sealed mode. The bidirectional pressure high-temperature butterfly valve has the advantages of being high in applicable temperature, good inbidirectional sealing performance and the like.

Description

technical field [0001] The invention belongs to the field of valves, in particular to a triple eccentric butterfly valve. The invention is suitable for working condition of high temperature medium. Background technique [0002] Triple eccentric butterfly valves are widely used in industrial pipelines such as metallurgy, electric power, petrochemical industry, water supply and drainage, and municipal construction, for regulating flow and carrying and breaking fluid. Due to its own structure, the traditional triple eccentric butterfly valve can only be positively pressure-bearing and sealed. Even if the floating seat two-way pressure butterfly valve developed in the later period uses an O-ring to prevent the valve seat from leaking the medium, the service temperature of the valve is limited and the service temperature is low. Contents of the invention [0003] The object of the present invention is to provide a bi-directional pressure high temperature butterfly valve suita...

AI Technical Summary

Problems solved by technology

The traditional triple eccentric butterfly valve can only be positively pressure-bearing and sealed due to its own structure

Even if the floating seat two-way pressure butterfly valve developed in the later stage uses an O-ring to prevent the valve seat from leaking the medium, the service temperature of the valve is limited, and the service temperature is low.

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