Hard sealing double eccentric butterfly valve for S-shaped elastic double O-shaped metal sealing ring

Abstract

The invention discloses a hard sealing double eccentric butterfly valve for an S-shaped elastic double O-shaped metal sealing ring, which comprises a double eccentric butterfly plate, a valve body and a valve rod and is characterized in that the S-shaped elastic double O-shaped metal sealing ring is placed between the double eccentric butterfly plate and the valve body, and a regulation mechanism consisting of a pressing ring, a control ring, a positioning plate, a regulating screw bolt and a retainer ring is arranged at the sealing ring part. The S-shaped elastic double O-shaped metal sealing ring structure is adopted, so the problem of complicated sealing structures or single static sealing design structures caused by the dynamic and static sealing coupling is effectively solved, and the sealing structure is simplified. The sealing ring part is provided with a regulating structure, the elastic deformation quantity and the deformation direction of large and small elastic O-shaped metal sealing rings can be simultaneously regulated, the elastic deformation quantity and the elastic force can be effectively provided, the reliability of the sealing performance is improved, the deformation caused by the heat expansion and cold contraction of materials can be obviously and perfectly compensated particularly in high and low temperature application occasions with sharp temperature change, and the internal sealing performance of the butterfly valve is ensured.

Description

technical field [0001] The invention relates to a butterfly valve for controlling the circulation of pipeline media, in particular to a double eccentric butterfly valve with S-shaped elastic double O-shaped metal sealing ring and hard seal. Background technique [0002] Butterfly valve is a valve widely used in the pipeline system of petroleum, chemical industry, shipbuilding, nuclear power plant and other industries to control the flow of pipeline medium. Among them, the elastic metal hard seal double eccentric butterfly valve has good low and high temperature resistance and double eccentric structure. It has the advantages of reducing unnecessary excessive extrusion between the butterfly plate and the sealing ring, the degree of scraping, and low opening and closing torque, and is used in special working conditions such as high temperature. The existing elastic metal hard sealing structure mainly adopts elastic sealing rings such as U-shaped metal sealing ring and hollow O...

AI Technical Summary

Problems solved by technology

[0005] Due to the use of S-shaped elastic double O-shaped metal sealing ring structure, it effectively solves the problem of complex sealing structure or separate design of static sealing structure caused by dynamic and static sealing coupling, and simplifies the sealing structure; design pressure ring, adjusting bolt, The adjustment structure composed of the control ring and other parts can simultaneously adjust the elastic deformation and deformation direction of the large and small elastic O-shaped metal sealing rings, which can effectively provide the elastic deformation and elastic force, and improve the reliability of the sealing performance, especially in the In high and low temperature applications where the temperature changes rapidly, it can obviously better compensate the deformation caused by thermal expansion and contraction of the material, ensuring the internal sealing performance of the butterfly valve

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