At present, the butterfly valve as a pipeline system used for on-off and flow control components, has been in the petroleum, chemical industry, metallurgy, water, electricity and many other fields has been very widely used. The public to know in the butterfly valve technology, the use of its seal form sealed structures, sealing materials for rubber, PTFE and so on. Structural characteristics as a result of the restrictions, not meet high temperature, high pressure and corrosion resistance, abrasion resistance and other industries.
A more advanced existing three eccentricity metal butterfly hard seal butterfly valve, valve body and seat components for the Siamese, the valve seat sealing surface layer welding temperature, corrosion resistant alloy material. Stacked multi-layer soft ring fixed in the valve plate, the butterfly valve butterfly valve as compared with traditional high temperature, operation light, no friction hoist, the closure of the torque transmission mechanism with the increase to compensate for sealing to improve the a butterfly valve sealing performance and durability advantages.

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