... valve Size from DN50-1800mm High quality and competitive price Manual Knife gate valve, wafer type knife gate valve, Lug knife ... Steel (WCB), Stainless Steel (SS304, SS316, SS301, 316L), Cast Iron 4). Seal: Rubber, PTFE, Stainless steel, Hard Alloy 5). Working temperature ... stainless steel stainless steel Rubber,TPFE,stainless steel,hard alloy Manual flanged knife gate valve