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 ... 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 ...