Patent ID: 6766863
Filing Date: 2004-07-27
Classification: A62C,Y10T

Abstract:
In a fire fighting vehicle, a system for introducing a liquid foam concentrate into a water stream in varying amounts to maintain a predetermined percentage mixture, irrespective of variations in water flow rates, said vehicle including a source of electrical power, a water pump for delivering raw water through a delivery hose, a foam pump for delivering liquid foam concentrate from a supply tank into said delivery hose to be mixed with the raw water, a motor connected in driving relation to the foam pump and a microprocessor-based controller adapted to be energized from the source of electrical power and coupled in controlling relation to said motor for controlling the fluid flow output rate of the foam pump, the improvement comprising:(a) means activated upon application of electrical power from said source to the microprocessor-based controller for conditioning the system to introduce the liquid foam concentrate into the water stream by the foam pump upon detection of raw water flow in the delivery hose.