Butterfly valve with inflation seal valve plate

Abstract

The invention discloses a butterfly valve with an inflation seal valve plate, belongs to the technical field of butterfly valves, and aims to provide a butterfly valve with a good seal effect and small sealing and opening resistance. According to a technical scheme, the valve plate of the butterfly valve consists of an upper ball panel, a lower ball panel, an elastic ring and a seal holder ring; radii of curvature of the upper and lower ball panels are positioned on the same side, and ball centers are opposite in the same line on the same side; the elastic ring and the seal holder ring are in parallel encircling connection between circumferences of the upper and lower ball panels; and an air source connector is communicated with a cavity formed among the upper ball panel, the lower ball panel, the elastic ring and the seal holder ring of the valve plate through air holes. A rigidity seal structure of the traditional butterfly valve is changed, an inflation hollow valve plate with a double-layer structure is adopted, and the whole working process of the valve is qualitatively changed. The seal accuracy of the butterfly valve can reach a high level. The butterfly valve is skillful in design and novel in style, is an innovation for the seal design of the butterfly valve, achieves unexpected good effect and deserves promotion and application.

Description

technical field [0001] The invention relates to a sealed butterfly valve used in industrial pipelines, belonging to the technical field of butterfly valves. Background technique [0002] Butterfly valve is a valve widely used in metallurgy, building materials, petroleum, chemical industry and other industries. It is an indispensable and irreplaceable product in current industrial production. The main function of the butterfly valve is to control the on-off of the pipeline. The requirement for the butterfly valve is that the medium in the pipeline passes smoothly when it is opened, and it can achieve reliable sealing and stable function when it is closed, and it can withstand harsh environments such as high temperature, adhesion, corrosion and erosion. , with corrosion resistance, wear resistance, high temperature resistance and other sealing and reliable performance. [0003] Among the butterfly valves, the closed butterfly valve has high technical content, strict requi...

AI Technical Summary

Problems solved by technology

Since the hard seal is a head-to-head between metal and metal, the tightness is completed during rotation, the process requirements are high, and the manufacturing is difficult. It is difficult to manufacture high-quality A and B-level excellent products.

[0004] At the same time, during the opening and closing process of the sealed butterfly valve, due to the high pressure in the pipeline, the high sealing specific pressure, and the relatively large opening torque, this strong friction not only brings difficulties to manufacturing, but also causes serious damage to the sealing pair, which requires frequent maintenance. And replacement, also greatly reduces the service life of the sealed butterfly valve, is also an important problem that is difficult to solve at present

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