The Cla-Val  414-01 Pneumatically Operated Remote Control Valve is used where “on-off” control is required. Pressure signals from a remote control “open or close” a small auxiliary valve installed on the main valve cover, which in turn opens or closes the main valve. Once sensing pressure drops to “set” pressure the snap action pilot opens to relieve main valve cover pressure to open deluge  valve. Once open the pilot valve must be “manually reset” in order to close the valve.