NAFFCO

• 0-90 second field replaceable time delay retard • Easy to read retard time delay adjustment knob • Weatherproof and UV resistant • Easy to read wire terminal designations • Two SPDT (form C) contacts

Deluge valve is a quick release, hydraulically operated diaphragm valve. It has three chambers, isolated from each other by the diaphragm operated clapper and seat seal. While in ‘SET’ position, water pressure is transmitted through an external bypass check valve and restriction orifice from the system supply side to the top chamber, so that supply pressure in the top chamber acts across the diaphragm operated clapper which holds the seat against the inlet supply pressure because of differential pressure design.