Full lining bidirectional composite soft sealing butterfly valve

Abstract

The invention discloses a full lining bidirectional composite soft sealing butterfly valve, belonging to the butterfly valves for pipelines of a large-scale water supply and drainage engineering, sea water and wastewater treatment, fresh water, gases and the like. The full lining bidirectional composite soft sealing butterfly valve comprises a valve body, a valve seat, valve shafts, a valve plate, a connecting seat, a pressing cover, bushes, a seal ring and a rear end cover, wherein the valve seat is arranged on the valve body; the valve shafts are arranged on the central line of the valve body; the valve plate is connected with the valve shaft; the connecting seat, the pressing cover, the bush and the seal ring are mounted on the upper part of the valve body; and the rear end cover is arranged at the bottom of the valve body. The full lining bidirectional composite soft sealing butterfly valve is characterized in that the valve shaft is formed by connection of an upper valve shaft (4) and a lower valve shaft (9); the valve seat (3) adopts a composite off-center inclined plane sealing form to be directly vulcanized on the valve body (1) and fully cover the valve body (1); the valve plate (2) is an inclined plate sphere; the upper and lower supports of the valve body (1) are sealed through an O-shaped seal ring (8); and the bushes (7) are respectively installed in the upper and lower supports of the valve body (1). The invention has the advantages of corrosion resistance, long service life and good sealing property while avoiding lock or setover of closure.

Description

technical field [0001] Fully lined two-way composite soft-sealed butterfly valve belongs to the butterfly valve used in large-scale water supply and drainage projects, seawater, sewage treatment, fresh water, gas and other pipelines. Background technique [0002] Butterfly valve refers to a valve whose closing part (disc or butterfly plate) is a disc that rotates around the valve shaft to open and close. It is mainly used for cutting and throttling on pipelines. Sewage treatment, fresh water, gas and other pipelines. 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. Existing butterfly valve is made up of valve body, valve seat (rubber seat), valve plate, pressing plate, valve shaft, axle sleeve, connecting seat, end cover, transmission device etc. In the process of use, there are many problems such as serious internal corrosion,...

AI Technical Summary

Problems solved by technology

In the process of use, there are many problems such as serious internal corrosion, inaccurate sealing position, easy locking of the valve plate or over-closed position when closing, unable to meet the requirements of two-way sealing, and excessive switching torque of large-diameter valves.

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