fire alarm system 1.cast iron 2.DN100,125,150 3.working pressure:1.2mpa fire alarm system1.Material: Cast Iron 2.Size: DN100mm, 150mm,200mm3.Type: Wet 4.Automatic Hydraulic Operated Nominal diameter: 100mm, 150mm, 200mmFlow coefficient : 15~60 (L/min)Nominal working pressure: 1.2MPaStrength test pressure: 4.8MPaFriction drag: < 0.07Mpaalarm bell : >80db Suitable temperature:4~80°CAutomatic fire ...