The multi-layer hard seal butterfly valve with worm gear utilizes a precise J-shaped elastic sealing ring and a triple-eccentric multi-layer metal hard seal structure. It is widely used in industrial pipelines with medium temperatures up to 425°C in metallurgy, electric power, petrochemical industry, as well as water supply and drainage and municipal construction, for regulating flow and cutting off fluids. This valve adopts a triple-eccentric structure, with the valve seat and disc sealing surface made of stainless steel with different hardnesses, providing excellent corrosion resistance and a long service life
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