Deluge Valve China is a core element in wet pipe fire sprinkler systems. It serves a dual purpose which prevents a reverse flow of water (non-return), also provides for the use of the water motor gong. Meanwhile, in the event of variable pressure conditions, a false alarm is prevented with the provision of retard chamber at the external bypass. A deluge valve is a quick release, hydraulically operated diaphragm valve used in a deluge system. And deluge system is used in conditions that require the quick application of large volumes of water, such as storage tanks, equipment pits, conveyor protection, etc.