Double-eccentric butterfly valve

Abstract

The invention relates to angle seat valves, and discloses a double-eccentric butterfly valve. The double-eccentric butterfly valve comprises a valve body, a shaft rod and a disc plate, wherein the valve body is provided with a sealing face, and a step with an annular shape is arranged at the inner edge of the sealing face; an annular first sealing ring is arranged at the step, an annular first groove is formed in the middle of the first sealing ring, the top of the outer wall of the first groove extends outwards to form an annular boss, and the bottom face of the boss is tightly attached to the sealing face; and the upper part and the lower part on the inner side of the inner wall of the first groove are divided into two inclined faces which are inclined inwards, a second sealing ring is further inlaid on the sealing face, and an insert covering the sealing face is further arranged at the sealing face. According to the valve, the first sealing ring and the second sealing ring cooperatefor sealing, moreover, the structure of the first sealing ring is improved, several seals are formed by the inner wall and the outer wall of the first sealing ring during sealing, so that the influence of the outside on the sealing performance is reduced; in addition, the friction between the disc plate and the first sealing ring is reduced, the torque of the disc plate is small, and the servicelife is long; and the upper part of the shaft rod is of a stepped structure, so that the shaft rod can be prevented from being blown out due to accidental breakage.

Description

technical field [0001] The invention relates to an angle seat valve, in particular to a double eccentric butterfly valve. Background technique [0002] Butterfly valve is a valve commonly used in the industrial valve industry at present. It is a regulating valve with simple structure and can be used for switching control of low-pressure pipeline media. A valve that achieves opening and closing. The most common problem encountered in the use of existing valves is that the sealing valve seat cannot withstand high temperature, and the sealing structure will greatly reduce its sealing performance and service life under the influence of temperature, pressure and wear. Contents of the invention [0003] The main purpose of the present invention is to provide a double eccentric butterfly valve, which can effectively solve the problems in the background technology. [0004] In order to achieve the above object, the technical scheme that the present invention takes is: [0005] ...

AI Technical Summary

Problems solved by technology

The most common problem encountered in the use of existing valves is that the sealing valve seat cannot withstand high temperature, and the sealing performance of the sealing structure will be greatly reduced under the influence of temperature, pressure and wear, and the service life will also be greatly reduced

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