2"~12" 1.0/1.6/2.0/2.5MPa PTFE liner ring inside, corrosion resistant. ISO, API, ASTM, ANSI, DIN, BS, ... , Cast Steel, Stainless Steel+EPDMStem: SS316, Stainless Steel.Seat: PTFE, NBR.Bushing: PTFE, Bronze.O-Ring: EPDM, Fluorine RubberStandard:1) Design Standard ... , ISO5752 series 20, BS5155.5) Test&Check: API598. Wafer Type PTFE Lined Butterfly Valve