Patent ID: 8261764

Claim:
An air charging system configured to maintain a supply of pressurized air in a water tank, comprising: a water supply; a charging tank comprising a water supply inlet, a venturi inlet, and a storage tank outlet, wherein said charging tank is configured to receive water from said water supply through said water supply inlet; a storage tank configured to receive water from said water supply, wherein the water from the water supply inlet conducts air from said charging tank to said storage tank; and a venturi comprising a storage tank inlet, a vent, and a charging tank outlet, wherein said vent is in fluid communication with an air source; wherein in response to the water supply being active, there is substantially no flow through the venturi, and wherein in response to the water supply being inactive, water from said storage tank is supplied to said venturi, such that said air is siphoned through said vent and introduced to and mixed with said water to create an air-water mixture which is supplied to said charging tank for pressurizing said storage tank.