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Preaction Valve Preaction sprinkler system is developed in recent years, it will fire detection and alarm and sprinkler system technology to combine protect objects of dual protection role in the fire did not occur in the system inflatable inner piping system side, so the system has the characteristics of dry system, to meet the conditions of high temperature and cold sprinkler requirements. in case of fire, installed in protected areas temperature, smoke detector first sends fire alarm, fire alarm controller after receiving the alarm signal, issue a command signal to open the deluge valve, then filled with water to the system side of the pipe network, in front of closed nozzle is not open, the system into a wet system. at the same time the hydraulic police bell alarm, pressure switch operation, start sound and light alarm to within the display tube network has been filled with water. in this case, if the fire continues to develop, closed sprinklers glass ball broken sprinkler nozzle .