The wide-range proportioner accurately proportions foam concentrate into a water stream over a wide-range of system flow rates. The device is configured to proportion foam concentrate at a 3% ratio. Wide-range proportioners are an integral part of an approved foam system. In addition to the wide-range proportioner, the main components of the approved foam system are: foam concentrate, a foam storage tank, a concentrate control valve, and foam discharge devices.

The system must be designed so that the wide-range proportioner can accurately proportion foam over the range of flow rates expected during the system operation.

The wide-range proportioner has the capability to accurately proportion foam concentrate into the water supply at low flow rates as required when only a small quantity of sprinklers have activated.