... wafer or lug butterfly valve, with various rubber seats, EPDM,NBR,VITON,PTFE,e Rubber Seat For concentric butterfly valves. Various of ... .The feature is as following: MaterialsApplicable mediumFeatureApplicable temperature°C Natural rubber(X1)Fresh water, Sea water,Salt, Strong base,Weak base ... ,Food High elasticity-20°C~+85°C Hypalon(X2)Fresh water,Sea water,Salt, Strong base,Weak base ...