Flange type metal hard seal butterfly valve belongs to the category of butterfly valve, which is mainly used in petroleum, gas, chemical industry, water treatment and other industries. The valve is designed based on the three-dimensional eccentric principle, and its seal ring rotation axis forms an angle of 6 ° -10 ° with the valve body channel axis to form an inclined conical structure. The friction between the valve plate and the sealing ring is eliminated through the cam effect, and it has the function of closing tighter, flexible operation and reliable sealing.

The sealing surface of butterfly plate adopts the process of inlaying stainless steel sealing ring or surfacing stainless steel and cemented carbide, which is suitable for high temperature and dirty medium conditions. The valve body material covers cast iron, stainless steel and chromium molybdenum steel series, and the sealing ring adopts the composite structure of multi-layer stainless steel and high temperature resistant asbestos plate. The valve stem materials include 2Cr13, 1Cr13 stainless steel and chromium molybdenum steel. The torque stability is ensured by optimizing the contact angle characteristics between the butterfly sealing surface and the valve seat.