... ,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, ... drag: < 0.07Mpaalarm bell : >80dbSuitable temperature:4~80°CAutomatic fire deluge valve for fire prevention is a kind of lever-type structure with ... various type of dry type system, such as deluge alarm system, water curtain system and water mist system.