Deluge alarm valve can be initiated under wet-type, dry, electric or manual control. It is a non-return valve to let water flow in the spraying system automatically without return and give alarm. It is widely used in shower system, pre-operating system, atomizing system and water curtain system.
　Shower system is applicable to places with high fire hazard, much flammables, large heating capacity, fierce combustion and quick spreading as well as the need of dense spraying within the same protective area, such as the storage room of liquefied gas bottles, the production workshop of foam rubber, the warehouse of chemical fibers, the stage of theater, telecasting studio and movie studio.
　Pre-operating system is a new auto spraying extinguishments system, which is more and more widely used. It has the advantages of early alarm, quick spaying, complete functions and wide application. Beside of places where wet-type system and dry system are applicable, it is also applicable to high temperature by water and forbid miss-spraying due to non-fire causes, e.g. high class hotel, library of treasured books, archives and storage of valuables.
　Atomizing system is used for the extinguishments of solid fire, liquid fire and electric fire as well as the protection and cooling for the production, storage, loading or unloading equipment of flammable gas and liquid type A, B and C, e.g. the drying place of common flammables such as paper and textile, industrial equipment with fire danger, workshop with dust fire danger, transformer, cable, oil tank as well as the reservoir of liquefied gas and flammable liquid.
　Water curtain system is applicable to the stage entrance, door, window, hole and flammable structure wall as an independent fire protection or joint protection with fireproof rolling-up curtain and glass curtain wall, for fire retardant, isolation of space, sealing of door, window and hole, separation of entrance, cooling of the external surface of building, etc.