Eccentric butterfly valve

Abstract

The invention belongs to the technical field of butterfly valves, and particularly relates to an eccentric butterfly valve. The eccentric butterfly valve comprises a valve body, wherein a valve plateis rotationally connected to the inside of the valve body, and an upper shaft and a lower shaft are fixedly connected to the top and the bottom of the valve plate respectively; a driving mechanism used for driving the upper shaft to rotate is arranged at the position, corresponding to the upper shaft, of the top of the valve body; the lower shaft is rotationally connected with the valve body, a valve seat used for sealing the valve plate is arranged in the valve body in the radial direction, and the valve plate is in sealing connection with the valve seat after rotating; an annular cavity is formed in the position, corresponding to the valve seat, of the valve plate, and a sealing cylinder is connected to the inside of the annular cavity in a sliding and sealing mode; and the bottom of theannular cavity communicates with a high-pressure air source through a vent hole and an air valve. According to the eccentric butterfly valve, the sealing cylinder is pushed out after the annular cavity is inflated, so that the sealing performance of the valve plate and the valve seat is improved, and internal leakage of the butterfly valve is reduced.

Description

technical field [0001] The invention belongs to the technical field of butterfly valves, in particular to an eccentric butterfly valve. 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. [0003] Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. It mainly plays the role of cutting and throttling on the pipeline. The opening and closing part of the butterfly valve is a disc-shaped butterfly plate that rotates around its own axis in the valve body to achieve the purpose of opening and closing or adjustment. Landslides, sideslips, and collapses of slopes. Eccentric butterfly valves are divided into single eccentric butterfly valves, double eccentric butterfly valves, triple eccentric butterfly valves and variable ec...

AI Technical Summary

Problems solved by technology

[0005] In order to make up for the shortcomings of the existing technology, the valve plate in the existing butterfly valve relies on the eccentric distance after rotation to control the extrusion force between the valve plate and the valve seat, which is a passive seal. When the valve seat is scratched or slightly corroded, It is easy to cause internal leakage of the butterfly valve and affect the sealing performance of the butterfly valve. An eccentric butterfly valve proposed by the present invention

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