... , NF,BSMain materials:WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12M02Ti, CF8, CF8M, CF3, CF3MSeal type: hard seal, soft sealLeakage: hard seal:Grade D (Liquid0.1XDNmm ... /pneumatic switchover Our company can produce various kinds of knife gate valve with high quality and best price.