... system 2.DN100,125,150 3.working pressure:1.2mpa New Cast iron Fire Alarm Valve Fire Fighting Equipment Fire Alarm ... Valve1.Material: Cast Iron 2.Size: DN100mm, 150mm,200mm3.Type: Wet 4.Automatic Hydraulic Operated Nominal diameter: 100mm, 150mm, 200mmFlow coefficient ... function, deluge sprinkler system is widely used for various type of dry type system, such as deluge alarm system, water curtain ...