Patent ID: 8733460

Claim:
A liquid disbursement system configured to selectively provide a source of pressurized liquid to a desired location in the absence of electricity, the liquid disbursement system comprising: a pump having a gas inlet, a liquid inlet, and a liquid outlet; a source of liquid coupled to the liquid inlet of the pump; a liquid discharge line coupled to the liquid outlet of the pump, the liquid discharge line configured to supply liquid from the liquid outlet of the pump to a liquid delivery system; a source of gas coupled to the gas inlet of the pump via a gas intake line, the gas intake line including a valve disposed between the source of gas and the pump, the valve receiving a gas pressure from the source of gas, the valve configured to open so as to supply the gas to the pump so as to cause the pump to expel the liquid from the liquid inlet out the liquid outlet; and a sensing line connected between the liquid discharge line and the gas intake line, the sensing line applying a liquid pressure from the liquid discharge line to the valve, such that the valve is open when the applied liquid pressure has a predetermined relationship with respect to the gas pressure, and is closed when the applied liquid pressure does not have the predetermined relationship with respect to the gas pressure.