... rubber seats, EPDM,NBR,VITON,PTFE,e Rubber Seat For concentric butterfly valves. Various of rubber for ... different medium. There are soft seat and rubber seat with glass back.The feature is as following ... ,Food. High performance resistant, corrosion resistant-20°C~+200°CShort time +250°C PTFEFresh water, Sea water, ... High performance resistant, corrosion resistant -10°C~+200°C Rubber seat