| 摘要 |
A foam generating system utilizes a positive displacement pump to deliver liquid at a substantially constant liquid delivery rate to a foam generator. The liquid delivery rate is independent the pressure of air supplied by a pressurized air source to the foam generator, the back pressure of the foam generator itself, the volume of liquid in a supply tank, and the pressure drop of the connection line from the foam generator to a user appliance. The foam generator delivers foam at a constant foam delivery rate (expressed as weight of foam per unit time) to the user appliance. The liquid supply tank is vented to atmosphere.
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