Pneumatic type self-locking butterfly valve

Abstract

The invention discloses a pneumatic type self-locking butterfly valve, which comprises a valve body, wherein a connector is fixedly installed at the top of the valve body; a transmission mechanism is fixedly connected to the top of the connector; and a fixing block is fixedly installed in the wall of the transmission mechanism. According to the pneumatic type self-locking butterfly valve, a locking mechanism is arranged in the connector, when a butterfly valve handle is rotated, the valve element rotates, a fixing ball drives an eccentric disc to eccentrically rotate through a telescopic rod, under the inertia effect, the eccentric disc reversely controls the opening angle of a limiting claw through the telescopic rod when rotating, the gravity center of the fixing ball is also changed along with the opening angle change of the limiting claw, the pressure between the outer surface of a clamping ball and the outer surface of an oblique thread is also changed, but the limiting claw is always kept in contact with the oblique thread, so that the sealing performance is ensured, the resistance generated when the handle is rotated is reduced, the labor-saving effect is achieved, and the problems that the surface area of a butterfly plate of a traditional butterfly valve is too large, and opening and closing are strenuous are solved.

Description

technical field [0001] The invention relates to the technical field of butterfly valves, in particular to a pneumatic self-locking butterfly valve. Background technique [0002] Butterfly valve, also known as flap valve, is a regulating valve with simple structure, which 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. The pipeline mainly plays the role of cutting and throttling. The opening and closing part of the butterfly valve is a disc-shaped butterfly plate, which rotates around its own axis in the valve body, so as to achieve the purpose of opening and closing or adjustment. [0003] Since the butterfly plate of the butterfly valve is in direct contact with the fluid medium, and in order to ensure the passage of the medium and the transmission efficiency, the diameter of the butterfly plate is often very large. When the butterfly valve is opened and closed, the ...

AI Technical Summary

Problems solved by technology

[0003] Since the butterfly plate of the butterfly valve is in direct contact with the fluid medium, and in order to ensure the passage of the medium and the transmission efficiency, the diameter of the butterfly plate is often very large. When the butterfly valve is opened and closed, the impact force and pressure of the fluid medium will make the process very laborious. It is not conducive to controlling the passage of fluid medium. At the same time, when the butterfly valve is completely closed, due to the different pressure on both sides of the butterfly valve and the impact force generated by the flow of the fluid medium itself, these factors will break the force balance of the butterfly plate. If this happens for a long time, the butterfly plate will become loose, and the sealing performance of the butterfly valve will be reduced, resulting in leakage.

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