Bi-directional three-eccentric center butterfly valve

Abstract

The invention discloses a bi-directional three-eccentric center butterfly valve. The bi-directional three-eccentric center butterfly valve comprises a valve body and a valve seat. A left inlet connecting pipe and a right inlet connecting pipe are arranged on the two sides of the valve seat respectively. The left inlet connecting pipe communicates with an upper left air inlet hole. The right inletconnecting pipe communicates with an upper right air inlet hole. A control box is arranged on the upper part of the valve body. A cavity with the fan-shaped section is formed in the control box. A pressurization plate is arranged in the cavity. One end of the pressurization plate is fixedly connected with a valve rod. The cavity is divided by the pressurization plate into a pressurization chamberon one side and a decompression chamber on the other side. According to the bi-directional three-eccentric center butterfly valve, the pressure of media is utilized to generate action force on the pressurization plate, torque is generated by the pressurization plate on the valve rod, then the additional action force is applied to a valve plate, the sealing specific pressure between a sealing surface of the valve plate and a sealing surface of the valve seat is increased, and the sealing effect is improved; and the pressurization effect is also achieved when reverse connection is carried out, the bi-directional strengthened sealing effect is achieved, and the problem that a three-eccentric center butterfly valve only has the good sealing effect in one direction is solved.

Description

technical field [0001] The invention relates to a valve, in particular to a bidirectional triple eccentric butterfly valve. Background technique [0002] Triple eccentric butterfly valves can be used in petroleum, chemical, electric power and other industries. It has three metal hard-sealed butterfly valves with geometric eccentric structures, which are sealed by torque and applied to severe working conditions. [0003] The existing triple eccentric butterfly valve only has the characteristics of good one-way sealing, that is, if the medium enters the inner cavity of the butterfly valve from the inlet of the valve, it has good sealing performance when the valve is closed, but if the medium enters from the outlet side of the valve Butterfly valve cavity, the valve will not be able to maintain a good seal. Contents of the invention [0004] The purpose of the present invention is to provide a bi-directional triple eccentric butterfly valve to solve the problems raised in t...

AI Technical Summary

Problems solved by technology

[0003] The existing triple eccentric butterfly valve only has the characteristics of good one-way sealing, that is, if the medium enters the inner cavity of the butterfly valve from the inlet of the valve, it has good sealing performance when the valve is closed, but if the medium enters from the outlet side of the valve Butterfly valve cavity, the valve will not be able to maintain a good seal

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