fire alarm system 1.cast iron 2.DN100,125,150 3.working pressure: ... alarm system1.Material: Cast Iron 2.Size: DN100mm, 150mm,200mm3.Type: Wet 4.Automatic Hydraulic Operated Nominal diameter: 100mm, 150mm, 200mmFlow ... , deluge sprinkler system is widely used for various type of dry type system, such as deluge alarm system, water curtain system and water mist system.water flow ...