Full-flow-channel drift-diameter triple-eccentric metal lining sealing butterfly valve

Abstract

The invention discloses a full-flow-channel drift-diameter triple-eccentric metal lining sealing butterfly valve which comprises a valve body, a valve seat and a butterfly plate, a cavity is formed in the valve body, openings are formed in the two sides of the valve body to form a flow channel communicated with the cavity, the valve seat is installed at the openings, shaft holes are formed in the two ends of the valve body, a driving shaft connected with a power unit and a linkage shaft rotating along with the driving shaft are installed in the shaft holes respectively, the section of the butterfly plate is in a C shape along the center line of the shaft holes, the two ends of the butterfly plate are connected with the driving shaft and the linkage shaft respectively, and one side of the cavity is concave inwards relatively to form a concave cavity. The butterfly plate rotates between a closed state and a full-open state, wherein when the butterfly plate is in the close state, the butterfly plate makes sealing contact with the valve seat so that the flow channel can be blocked and broken, and when the butterfly plate is in the full-open state, the butterfly plate is located in the concave cavity to form a full-flow-channel full-open state. A full-fluid channel design is adopted, the inner diameter of the channel is consistent with the diameter of a pipeline, a butterfly plate pressing ring and a sealing ring cannot hinder media from passing when the butterfly plate is in the full-open state, the butterfly valve almost has zero flow resistance, the flow resistance coefficient is small, and the pressure drop is low.

Description

technical field [0001] The present invention relates to the technical field of a butterfly valve, and more specifically, the disclosure relates to a triple-eccentric metal-lined sealing butterfly valve with full channel diameter. Background technique [0002] Butterfly valve, also known as flap valve, is a shut-off valve and regulating valve with simple structure. The closing part (disc or butterfly plate) of butterfly valve is a disc, and the butterfly plate rotates around the valve shaft to achieve the purpose of opening and closing. The butterfly valve is simple in structure, small in size and light in weight. It consists of only a few parts, and it can be opened and closed quickly only by rotating 90°. The operation is simple, and the valve has good fluid control characteristics. [0003] However, all traditional butterfly valves, whether centerline, double eccentric or triple eccentric butterfly valves, due to their own structural limitations, when the butterfly valve i...

AI Technical Summary

Problems solved by technology

[0004] 1). The thickness of the butterfly plate produces a corresponding flow resistance. The thicker the butterfly plate, the greater the flow resistance. When a high-pressure butterfly valve is required, the thickness of the butterfly plate will be large, the corresponding flow resistance will become larger, and the pressure loss will be large.

[0005] 2). The diameter of the sealing seat of the valve body is usually smaller than the diameter of the pipe, so when the medium passes through the valve seat of the butterfly valve, flow resistance and turbulent flow will occur, and the pressure loss will be large

[0006] 3). When the butterfly valve is fully opened, the medium will wash the butterfly plate and sealing ring in front for a long time, the sealing ring will wear quickly, and the service life of the valve will be short

[0007] 4). When some medium passes through the butterfly valve, it usually accumulates around the valve seat or wraps around the sealing ring, resulting in poor sealing and reduced sealing performance

[0008] 5). After long-term use, the seat surface of the oblique elliptical cone section and the sealing ring of the disc plate are prone to severe wear on one side

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