Pumps

The Balanced Pressure Pump Proportioning System functions by maintaining an equal pressure in the foam concentrate and water inlets to the Proportioner, allowing the Proportioner to be used over a wide range of flows and pressures. The system connects to an atmospheric storage tank which allows refilling during operation. Controls respond quickly and accurately to changes in the water inlet pressures and flow rates.

The system operates by passing the required portion of foam concentrate from a positive displacement pump to a venturi Proportioner with the remaining portion recirculating through a diaphragm valve in the return line to the tank. The diaphragm valve senses and balances the pressure (which can also be balanced manually) in the foam and water lines to the Proportioner. The foam concentrate then enters the Proportioner where a built-in orifice regulates the flow of pressurized foam concentrate entering the water stream.

The skid units are available in six Proportioner sizes ranging from 2 to 8 in. with flow rates from 30 to 5500 gpm (114 to 20,816 Lpm). Each unit consists of a positive displacement foam pump with electric motor and starter; various control, drain, and check valves; pressure balancing diaphragm valve; duplex gauge; foam Proportioner; interconnecting brass pipe; and stainless steel valve identification and system instruction nameplates.

Pump Skids are used in combination with atmospheric storage tanks.