D343W stainless steel butterfly valve (also known as stainless steel flapper valve) usually 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 for regulating 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.