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The stainless steel butterfly valve adopts three-eccentricity multi-layer metal hard sealing structure. It is widely used in metallurgy, electric power, petrochemical industry, water supply and drainage, municipal construction and other industrial pipelines with medium temperature ≤425 ° C, it is used for adjusting flow rate and carrying off fluid. The valve adopts three-eccentricity structure, the valve seat and disc sealing surface are made of different hardness and stainless steel, with good corrosion resistance and long service life.