Foam proportioning system with low-end controller
First Claim
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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.
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Abstract
Embodiments of the invention provide a foam proportioning system. The foam proportioning system can include a foam pump, at least one foam line, a divert, and at least one controller. The divert can direct a portion of a flow of a liquid foam concentrate downstream of the foam pump back through the foam pump. The controller, which can be in communication with the foam pump and the divert, can be configured to automatically maintain a minimum flow rate of the liquid foam concentrate through the foam pump.
45 Citations
10 Claims
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1. A foam proportioning system comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification