Gear wafer butterfly valve: DN50-DN300 2"~12", PN10/16/25 Flange: ANSI B16. ... : ANSI B 16.10 NP: PN1.6MPa PN25 Manual operated wafer type butterfly valve:SizeDN40-DN300End flangeANSI B 16.1, EN 1092 ... be used as a device to cut-off or regulate O-Ring ApplyFresh water, sewage, sea water, air, vapor, food, medicine, oils. acids, alkalis ...