Patent ID: 6886639

Claim:
An apparatus in which metered quantities of a liquid foam concentrate are injected into a plurality of water discharge lines conveying a water stream to thereby establish a predetermined concentration of the liquid foam concentrate in the water stream, comprising: (a) a tank for holding the liquid foam concentrate; (b) a positive displacement foam pump having an inlet port coupled to the tank and an outlet port; (c) a plurality of water discharge lines, each adapted to convey raw water from a source thereof to a discharge orifice selected from one of the water discharge lines including a water flow sensor; (d) a plurality of foam concentrate delivery lines leading from said outlet port of the foam pump to individual ones of the plurality of water discharge lines having a water flow sensor, each of the foam concentrate delivery lines including an electrically operated foam valve and a foam flow sensor; and (e) a line controller module for each of the foam concentrate delivery lines, the line controller modules coupled to receive flow information from the water flow sensor and the foam flow sensor of a water discharge line and a foam concentrate delivery line with which a given line controller module is associated and providing a control signal to the electrically operated foam valve for the foam concentrate delivery line with which said given line controller module is associated.