Low-torque and two-way zero leakage all-metal sealing butterfly valve

Abstract

The invention relates to a low-torque and two-way zero leakage all-metal sealing butterfly valve. According to the technical scheme, the low-torque and two-way zero leakage all-metal sealing butterflyvalve comprises an actuating mechanism, a thread sleeve, a lead screw, a connecting shaft, a valve rod, a bracket, a packing gland, a valve rod packing, a valve body, a valve seat, a butterfly plate,a reinforcing rib, a wedge splitting sliding component, a valve seat sealing filler, an all-metal sealing ring, a butterfly plate sealing filler, needle roller bearings and rollers. The low-torque and two-way zero leakage all-metal sealing butterfly valve adopts metal hard sealing and active sealing, sealing specific pressure is high, and zero leakage and two-way sealing are achieved; wear-proof,temperature-resistant and corrosion-resistant alloy materials are overlayed on the sealing surfaces of the valve seat and the butterfly plate, so that the service life is long; in the valve opening and closing processes, the sealing surfaces are not in contact, no friction is caused, operating torque is little, and the closing speed is high; the valve seat and the butterfly plate are of detachable structures, and are simple in structure, convenient in overhaul and low in maintenance cost; and the valve plate is relatively thin, so that the flow resistance is little, the discharge coefficientis high, and the scope of application is wide.

Description

technical field [0001] The invention belongs to the field of control valves, and relates to a low-torque, two-way zero-leakage all-metal sealing disc valve. Background technique [0002] The butterfly valve is a fluid switch that uses a disc-type opening and closing member to reciprocate and rotate about 90 degrees. It is usually used as a blocking opening, flow regulating valve and damping valve in liquid, gas, and other fluid pipeline systems. Large-diameter butterfly valves refer to valves with a diameter larger than 100cm. High temperature and high pressure metal hard seal butterfly valve can be widely used in the transportation of high temperature and high pressure medium in petrochemical, coal chemical, electric power and other industries. At present, the structure of domestically produced butterfly valves is mainly based on multi-level three-eccentric butterfly valves and rubber-lined centerline butterfly valves. However, these valve structures still have deficienci...

AI Technical Summary

Problems solved by technology

However, these valve structures still have deficiencies: the valve structure design is unreasonable, and the metal-sealed valve generally has a longer service life than the elastic-sealed valve, but it is difficult to achieve complete sealing, poor sealing, easy to leak, unstable work, and maintenance or repair. Troublesome maintenance operation, inconvenient use, poor practicability

At the same time, the replaceable integral metal sealing surface solves the different requirements for sealing surface materials in various working conditions; but because the technology and process are not perfect and mature, there are still many inherent defects in actual production and use. 1. The structure of the valve plate is relatively thick and the flow resistance is large, so it is not suitable for small-diameter pipelines below DN200; 2. The principle of the triple eccentric structure, the sealing between the sealing surface of the valve plate and the valve seat depends on the torque of the transmission device Press the disc against the seat

3. The sealing section between the butterfly plate and the valve seat of the triple eccentric butterfly valve is not circular but elliptical, and the shape of the sealing surface is therefore asymmetrical. One side is inclined to the centerline of the body, and the other side is parallel to the centerline of the body. Manufacturing and processing are more difficult (such as patent publication numbers CN107289143A, CN105299285A, etc.)

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