Hard seal butterfly valve is a high-performance butterfly valve using metal hard material as the sealing surface, widely used in petroleum, chemical industry, electric power, metallurgy, mining and paper and other high-temperature, high-pressure and corrosive working conditions. The valve is suitable for water, steam, oil, gas and strong corrosive media, with excellent wear and corrosion resistance. Hard seal butterfly valve adopts metal-to-metal sealing structure, reliable sealing, long life, suitable for frequent opening and closing and harsh working conditions. Product features include sturdy structure, flexible opening and closing, small flow resistance, easy operation, and can be equipped with manual, pneumatic, electric and other driving methods to realize automatic control. Its advantage lies in the high temperature and high pressure resistance, the sealing surface is not easy to be damaged, and the maintenance cost is low. Hard seal butterfly valve can not only effectively cut off and regulate the flow of media, but also ensure the safe and stable operation of the system, is the ideal fluid control equipment for demanding industrial fields.