U-shaped ring metal sealing butterfly valve and manufacturing method thereof

Abstract

The invention discloses a U-shaped ring metal sealing butterfly valve and a manufacturing method thereof. The sealing butterfly valve comprises a valve body, wherein the middle part of the valve body is hollowed out, a rotatable butterfly plate is installed at the middle part of the valve body, and a valve seat ring is arranged between the valve body and the butterfly plate; wherein the valve plate can be arranged in the valve body in an eccentric rotating mode, the valve seat ring is a metal elastic sealing ring, the cross section of the valve seat ring is roughly in a U shape, and metal sealing is formed between the valve seat ring and the butterfly plate through radial elastic force of the U-shaped ring. The U-shaped ring metal sealing butterfly valve provided by the invention is convenient to disassemble and assemble and high in sealing grade, can achieve eccentric structure sealing and pure metal elastic sealing at the same time, is not affected by forward and reverse pressure of a medium and further cold and hot expansion temperatures of the medium and effectively overcomes the disadvantage of a three-eccentric-center butterfly valve.

Description

technical field [0001] The invention relates to a butterfly valve and a preparation method thereof, in particular to a U-shaped ring metal sealing butterfly valve and a preparation method thereof. Background technique [0002] Butterfly valve, also known as flap valve, is a regulating valve with simple structure, which can be used for switch control of low-pressure pipeline medium. of a valve. It has the advantages of simple structure, small size, short structure length, small volume, light weight, convenient and quick opening and closing, etc. [0003] The triple eccentric structure is the most advanced butterfly valve structure at present, and it has many advantages that other types of butterfly valves cannot match. When it is opened, the valve seat and the sealing surface of the butterfly plate are disengaged instantly, and there is no friction between the two, thus prolonging the service life of the valve. However, there are also many problems in the use of this valve...

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Problems solved by technology

However, there are also many problems in the use of this valve. Since the multi-layer soft and hard laminated sealing ring is fixed on the butterfly plate, when the valve plate is normally open, the medium forms a positive wash on the sealing surface, and the metal sheet interlayer After the soft sealing belt is washed, it will directly affect the sealing performance; limited by the structural conditions, this structure is not suitable for valves with a diameter below DN200, because the overall structure of the valve plate is too thick and the flow resistance is large; due to the principle of triple eccentric structure, the butterfly plate The sealing between the sealing surface and the valve seat depends on the torque of the transmission device to make the valve plate press against the valve seat

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