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DOUBLE INTERLOCK, PREACTION SYSTEM
www.hdfire.comDouble Interlock Pre-Action System to automatical-ly actuate, two independent events must occur. The Deluge Valve Releasing Panel must operate and open the Solenoid Valve upon automatic operation of the electric fire detection initiating circuit and the sprin-kler system piping must lose air pressure due to op-eration of one or more sprinklers.