... DN 50 - 300 2)Nominal pressure:PN10 PN16 Wafer Type Butterfly Valve SizeDN50 - 300Design StandardAPI 609End flangeANSI 150# ... /PN10/PN16Top flangeISO 5211 BodyDuctile iron,Stainless steel,WCBDiscDuctile iron,CF8,CF8M,C95400Stem416,420,431,316SeatNBR, ... petrochemical, heat supply, shipbuilding, medicine and metallurgy industries. Valves are used for regulating or cutting off liquids in pipelines ...