Dual chamber foam pump

Details Dual chamber foam pump Dual chamber foam pump

1997-09-10

1999-06-08

Kashnikow, Andres

Fire extinguishers

Fluid systems

Plural source, mixing in transit

239 61, 239310, 239318, 417404, A62C 3500

Patent

active

059097752

ABSTRACT:
A fire fighting foam proportioner for use in providing precise proportioning of foaming agent to fire fighting liquid, e.g., water, includes a conduit incorporating a check valve and a venturi with a dual chamber piston pump having one part connected to the high pressure water source at the inlet to the conduit and the other part connected to a source of the foaming agent and arranged to pump the foaming agent through a foam conduit to the throat of the venturi where it is mixed with the water. Reversible valves responsive to pump movement are connected to the first pump part to cause it to reverse direction at the end of each stroke. A pair of one-way check valves at each of the inlet and outlet ports of the second pump part keep the foaming agent moving through the foam conduit where it is controlled by a pressure equalizing valve and a metering valve. The area of the foam conduit is controlled by the equalizing valve which includes a spool valve having pressure sensing areas at each end. One end senses inlet water pressure and the other end senses foaming agent pressure at the outlet of the second pump part. The metering valve is adjustable to vary the percentage of foam to water.

REFERENCES:
patent: 4722358 (1988-02-01), Christensen

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