Preaction alarm valve group is the automatic fire detection and alarm technology and automatic sprinkler system, closed sprinkler installation in the system.In the system when a fire breaks out at the end of the pipe is usually filled with low pressure air or nitrogen for testing, so the system has the characteristics of dry type system.So it is suitable for installation in the need to put out the fire with water, but both are definitely not allowed to fire running water.For example, library, archives, valuables storage room, computer room and so on.Also alternative dry systems installed in high temperature cold freezing, etc.

Preaction alarm valve group is made up of deluge valve and wet alarm valve series, up and down deluge valve located at the side of water supply, wet alarm valve side as preaction valve group is located in the system.

 

System consists of preaction valve, hydraulic alarm, pressure switch, air compressor, air maintenance device, signal butterfly valve and so on, closed sprinkler installation, and using the commonly used detection system as the alarm and start the device.