Proper proportioning is achieved simply by maintaining identical water and foam concentrate pressures at the respective inlets of the ratio controller. The diaphragm balancing valve automatically adjusts the foam concentrate pressure to correspond to the water pressure when foam concentrate is supplied to the ILBP Proportioning Module, at a constant pressure, from the foam concentrate pump system. As an option, the unit can be supplied with a manual override feature which includes a duplex gauge for monitoring the balancing of the foam concentrate and water pressures at the ratio controller as well as allowing the system to be manually balanced in the event of the diaphragm valve failure. Features May be used with either fresh or salt water. All foam concentrate valves, pipe and fittings are brass for compatibility with all types of foam concentrates, better corrosion resistance and reduction of sedimentation due to internal corrosion.
All manual valves are brass or bronze ball valves, which provide low loss characteristics.
Allows independent selection of water or foam discharge on systems with multiple discharge devices. Module utilizes an integral check valve in the foam concentrate line to prevent backflow of water into foam proportioning system. Proportioning Module shall be a complete self-contained unit designed to proportion foam concentrate with fresh or salt water, at the required percentage of concentration over the entire flow range of the ratio controller. See chart for appropriate flow range of proportioner. Proportioning Module shall include all piping, valves and fittings necessary to comprise a complete foam proportioning unit and shall be factory assembled using corrosion resistant materials ready for installation into the customers water supply main.