Patent ID: 7997348
Filing Date: 2011-08-16
Classification: A62C

Abstract:
1. A foam proportioning system comprising: a foam pump; at least one foam line in fluid communication with a source of liquid foam concentrate, at least one discharge line, and the foam pump; a divert having a recirculation line and a low-end control valve, the recirculation line having a first end positioned downstream of the foam pump and a second end positioned upstream of the foam pump, the divert operable to direct a portion of a flow of the liquid foam concentrate through the recirculation line; and at least one controller in communication with the foam pump and divert, the controller configured to automatically operate the foam pump and the divert to maintain a minimum flow rate of the liquid foam concentrate through the foam pump; the low-end control valve being in communication with the at least one controller, operating in response to a signal from the at least one controller, and automatically opening when a foam demand is less than the minimum flow rate of the liquid foam concentrate through the foam pump.