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Three eccentric multi-layer metal hard seal flanged butterfly valve, designed with three-dimensional eccentric principle, small driving torque, easy to operate, with high temperature resistance, high pressure, corrosion resistance, wear resistance and other characteristics! The valve body and the valve seat are connected components, the sealing surface of the valve seat is alloy material, multi-layer metal sealing ring is fixed on the plate, the sealing pair types are various, three eccentric characteristics (valve stem eccentric, sealing cone center line and pipe axis Angle eccentric) produce CAM effect, reduce the friction torque, achieve zero leakage seal.