High-performance butterfly valve capable of ensuring double seal

Abstract

The invention discloses a high-performance butterfly valve capable of ensuring double seal. The butterfly valve comprises a valve body, a butterfly plate and a valve shaft; the valve shaft is divided into an upper valve shaft and a lower valve shaft, and the butterfly valve further comprises a composite bearing and an adjusting pressing plate; a first sealing ring is arranged at the positions, close to the sealing face of the valve body, of the two sides of the butterfly plate, an adjusting screw hole is formed in the adjusting pressing plate, an adjusting screw is arranged on the adjusting pressing plate, a second sealing ring is arranged at the position, close to a nut of the adjusting screw, of the adjusting screw hole, and a third sealing ring located between the adjusting pressing plate and the butterfly plate is arranged at the end, close to the adjusting pressing plate and away from the first sealing ring, of the surface of the butterfly plate; and the composite bearing is adopted to support the valve shaft, the butterfly plate and the valve shaft are connected through a flat key for transmission, the transmission torque is large, detaching and overhauling are convenient, the first sealing ring makes contact with the wide valve body sealing face, when the butterfly plate is opened and closed, torque of the valve is effectively reduced, meanwhile the service life of the valve is prolonged, the adjusting pressing plate can achieve reverse seal of the valve, and the phenomenon that when the butterfly plate is closed, seal of the butterfly plate fails under medium pressure is avoided.

Description

technical field [0001] The invention relates to a butterfly valve, in particular to a high-performance butterfly valve ensuring double sealing. Background technique [0002] The butterfly valve is a control element connected with pipeline equipment. During the opening and closing operation of the valve, the customer hopes to reduce the opening and closing torque of the valve as much as possible. At present, the butterfly plate and the valve shaft of the butterfly valve are connected and driven by a conical pin, and the conical pin runs through the valve shaft. In order to increase the strength of the valve shaft, the diameter of the valve shaft needs to be increased, which will lead to an increase in production costs and an increase in torque, and the conical pin is The tight fit of the cone makes it very difficult to remove the cone pin when the valve shaft and the butterfly plate need to be disassembled and separated. At present, customers require two-way sealing for butt...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that increasing the diameter of the valve shaft will lead to an increase in torque, and the existing two-way sealing butterfly valve has a complicated structure and high production cost.

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