Solberg Ratio Controllers are a modified venture device designed to meter the correct amount of foam concentrate into a water stream over a specified range of flow and pressure rates with minimal pressure loss. The ratio controller consists of three components: the body with water inlet, metering orifice located in the foam concentrate inlet, and throat (nozzle) located downstream from the water inlet. The ratio controller is manufactured in four sizes 3.0″, 4.0″, 6.0″ and 8.0″ (76 mm, 102 mm, 152 mm, 203 mm).
