Large-caliber butterfly valve with high sealing performance

Abstract

The invention relates to a large-caliber butterfly valve with high sealing performance. The large-caliber butterfly valve comprises a valve body, a valve plate and a valve seat, wherein the valve seatmade of a rubber material is vulcanized on the inner wall of the valve body; the valve plate is mounted in the valve seat in a sealing mode; a valve shaft is vertically arranged in the valve plate ina penetrating mode; the valve shaft drives the valve plate to horizontally rotate; a plurality of supporting parts which are uniformly distributed peripherally are integrally arranged at the outer edge of the valve body; the lower end part of the valve body which corresponds to the bottom of the valve shaft is equipped with an end cover; and a coaxial press-fitting bearing is arranged between theend cover and the valve shaft. The butterfly valve improves stability, in a mounting process, of the butterfly. The supporting parts and the reinforcing ribs of the butterfly valve are integrated with the valve body, so that manufacturing cost is effectively saved. Torsion force of the valve plate is reduced by mounting the bearing; coaxiality of upper and lower end parts of the valve shaft is guaranteed by fixedly arranging a locating pin roll on the cover plate; and the valve plate is prevented from moving downwards under action of gravity, so that sealing performance of the valve is improved. The large-caliber butterfly valve has the characteristics of small flow resistance, reliable sealing, quick opening-closing and a long service life.

Description

technical field [0001] The invention belongs to the field of valves, in particular to a large-diameter butterfly valve with high sealing performance. Background technique [0002] The butterfly plate of the large diameter butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0°-90°. When the rotation reaches 90°, the valve is fully open. At present, especially in the fields of large and medium caliber, medium and low pressure, butterfly valve will become the dominant valve form. [0003] Traditional butterfly valves have the following problems: [0004] 1. Due to the large diameter of the flange butterfly valve, it is not easy to fix it during installation, and it is also inconvenient to lift. [0005] 2. During the use of the traditional butterfly plate, due to long-term operation, with the extension of the u...

AI Technical Summary

Problems solved by technology

[0004] 1. Due to the large diameter of the flange butterfly valve, it is not easy to fix during installation, and it is also inconvenient to lift

[0005] 2. During the use of the traditional butterfly plate, due to long-term operation, with the extension of the use time, the valve plate will move downward under the influence of gravity and other factors, which will greatly reduce the sealing of the butterfly valve. It brings great inconvenience to users, and also causes economic losses to users

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