... , stainless steel JIS, ANSI,DIN,GB standard Size DN50-1800 304/316 knife gate valve,Flange Knife gate valve, Chain wheel ... , SS301, 316L), Cast Iron 4). Seal: Rubber, PTFE, Stainless steel, Hard Alloy 5). Working temperature: Rubber <100'C, Hard-seal< 425'C ... if you neede. Welcome to contact us for more information. 304 Knife gate valve