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Application scope of gate valve in high temperature and high pressure power station: the gate valve in pound level power station is applicable to cut off or connect the medium on the pipeline of petroleum, chemical industry, thermal power station and other working conditions with class1500-3500lb and operating temperature of - 29-570 ℃. Applicable media: water, oil, heat transfer oil, steam, etc. The sealing surface of ram and valve seat is made of Stellite cobalt based hardfacing, which has good wear resistance, high temperature resistance, corrosion resistance and scratch resistance.