FP-400E-7DM Double Interlock Pre-action Electric-Pneumatic Release System
The BERMAD Model FP 400E-7DM Double Interlock Pre-action, Electric-Pneumatic Release System is suitable for use in systems requiring that water be kept out of the sprinkler piping until an electric detecting device and a sprinkler have both been activated. Electric-pneumatic double interlock systems include automatic sprinklers attached to a dry sprinkler piping system, with a supplementary electric detection system and a Pneumatic Supervised System of air pressure in the system piping, installed in the same area. The Supervised System consists of a Pneumatic Pilot Valve (PORV), pneumatic low pressure supply and an additional listed check valve including trim with low pressure switch, installed downstream from the Preaction Valve. The Double Interlock Electric-Pneumatic System admits water into the sprinkler piping only when the detection system through the control panel triggers the solenoid while simultaneously the PORV is activated due to the supervised system pressure drop.