The balanced pressure proportioning system functions
by maintaining an equal pressure in the foam concentrate and water inlets to the proportioner. This balancing ability allows the proportioner to be used over a wide range of ows and pressures. The system will also respond quickly and accurately to changes in the water inlet pressures and ow rates.
The system operates by passing the required portion of AFFF Foam Concentrate which is drawn from a FRP Foam Tank via a positive displacement pump to a Skum propor- tioner with the remaining portion recirculating through the return line to the Foam Storage Tank. The Pressure Relief and Sustaining Valve senses and balances the pressures in the foam concentrate and water lines to the proportioner.
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