System for introduction of concentrated liquid chemical foamant

Details System for introduction of concentrated liquid chemical foamant System for introduction of concentrated liquid chemical foamant

1993-10-29

1996-02-27

Pike, Andrew C.

Fire extinguishers

Fluid systems

Pump supply

169 14, 13710121, 222 63, 222135, 222255, 222265, 417 5, 417 46, A62C 3100

Patent

active

054941121

ABSTRACT:
A fire fighting system introduces a liquid chemical foam concentrate into a water stream. The system may incorporate either or both of a hydraulic motor driven pump under control of a microprocessor-based hydraulic valve driver and an electric motor driven pump under control of a DC motor drive circuit. The DC motor drive circuit is adapted to be connected in electrical communication with the hydraulic valve driver and with a display/controller also incorporating a microprocessor. When operating in the dual mode, when the quantity of chemical foamant that must be added to the water stream to maintain a desired percentage mixture exceeds the capacity of the electric motor driven foam pump, control is transferred, via the hydraulic valve driver, to allow a hydraulic motor to drive a separate foam pump. In this fashion, the electric motor driven foam pump can cover a first range of flow rates from a very low rate to an intermediate rate and the hydraulic system then taking over to extend the range from the intermediate flow rate to a relatively high flow rate.

REFERENCES:
patent: 4259038 (1981-03-01), Jorgensen et al.
patent: 4899825 (1990-02-01), Bosoni et al.
patent: 5174383 (1992-12-01), Haugen et al.
patent: 5218988 (1993-06-01), McNamara et al.

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