Novel triple-eccentric double-sealing butterfly valve

Abstract

The invention relates to a novel triple-eccentric double-sealing butterfly valve. A butterfly plate, a valve rod, a valve body and an outer hoisting ring are included; the valve rod is fixedly connected with the butterfly plate built in the valve body; a butterfly plate pressing plate fixedly connected with the butterfly plate is arranged on the front side of the butterfly plate; a sealing ring isarranged between the butterfly plate pressing plate and the butterfly plate, and an annular boss is arranged on the inner surface of the valve body; a valve base arranged on the front end face of theannular boss in a clamped manner is arranged in the valve body; an inner hoisting ring is arranged between the outer hoisting ring and the valve base, and the outer hoisting ring and the inner hoisting ring are fixedly connected through a screw; a step is arranged on the front end face of the valve base, and is provided with a PTFE ring, and a pressing plate is arranged between the PTFE ring andthe inner hoisting ring; and the inner diameter surface of the PTFE ring and the inner diameter surface of the valve base are in seal fit with the outer diameter surface of the sealing ring to form sealing pairs. The novel triple-eccentric double-sealing butterfly valve is simple in structure, and capable of achieving double sealing under a severe work condition environment, and the service life of the butterfly valve is prolonged; and when the butterfly valve is closed, half of the outer surface of the butterfly plate is in contact with the PTFE ring, the other half of the outer surface of the butterfly plate is in contact with the valve base, and therefore the double-sealing effect is achieved.

Description

technical field [0001] The invention relates to a butterfly valve, in particular to a novel triple-eccentric double-seal butterfly valve. Background technique [0002] Butterfly valve, also known as flap valve, is a regulating valve with simple structure, which can be used for switching control of low-pressure pipeline medium. of a valve. 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. At present, in the known designs of butterfly valves, there are no more than two structures for the sealing structure. One is a soft sealing structure, which is usually found in centerline butterfly valves, single ec...

AI Technical Summary

Problems solved by technology

However, the above two types have poor sealing effect and short service life under some severe working conditions.

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