... butterfly valve 1. Size: DN50-DN350; Pressure: PN10/PN16 2. Body:CI/DI; Disc: DI/SS; Seat: NBR/EPDM 3. Gear operated Wormgear Wafer Butterfly ... ISO 5752, BS EN 558.Flange Drilling: ANSI B 16.1, BS EN 1092-2, JIS 5K, 10K, 16K ... times rated pressure,Seat: 1.1 times rated pressure.Working Temperature-10°C to 80°C (NBR)-10°C to ... energy engineering as well as light industry. Wormgear wafer butterfly valve