Novel pneumatic expansion butterfly valve convenient to maintain

Abstract

The invention discloses a novel pneumatic expansion butterfly valve convenient to maintain, and belongs to the field of valves. The novel pneumatic expansion butterfly valve convenient to maintain comprises a valve body, a valve rod, a butterfly plate and a rubber expansion ring. The valve rod is fixedly connected to an end face of the butterfly plate. The novel pneumatic expansion butterfly valveconvenient to maintain further comprises a baffle ring and a removable ring seat. The baffle ring is fixed to the circumferential inner wall of the valve body. Annular clamping grooves are formed intwo opposite end faces of the movable ring seat respectively. The rubber expansion ring comprises an annular body and two annular retainer rings. The annular retainer rings overturn outwards and are matched with the annular clamping grooves respectively. The two annular retainer rings are tightly pressed by a junk ring and the baffler ring respectively. A plurality of positioning pins which are evenly distributed in the circumferential direction are arranged on the outer wall of the valve body in a penetration manner. Positioning pin holes are formed in the movable ring seat. An inflation holewhich communicates with the rubber expansion ring is formed in the circumferential outer wall of the movable ring seat. An inflation connector is connected with the outer wall of the valve body through threads. The inflation connector is connected with the inflation hole through threads. The novel pneumatic expansion butterfly valve convenient to maintain is simple in structure and reasonable indesigning; and the rubber expansion ring can be replaced conveniently and quickly.

Description

technical field [0001] The invention relates to the field of valves, in particular to a novel pneumatic expansion butterfly valve which is easy to maintain. 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. A valve; the valve 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. [0003] Aiming at the problems that the traditional butterfly valve has too much frictional torque between the valve plate and the valve seat when it is opened and closed, the service life of the valv...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in the prior art that it is troublesome to replace the rubber expansion ring of the pneumatic expansion butterfly valve and the sealing effect of the joint between the valve stem and the rubber expansion ring is not good, the purpose of the present invention is to provide a new type of pneumatic expansion butterfly valve that is easy to maintain

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