... blast furnace system, working as hot blast valve, combustion valve and high temperature chimney valve Model : QYTR42W,QYTR42fW,QYTR742W,QYTR742fW,QYTR942W, ... QYTR942fW, QYTR9T42W The hot blast valve without lining ... 1Cr18Ni9Ti and the special heat-resistant steel. This valve is applicable for the hot blast pipe of ...