Patent ID: 6945042

Claim:
A system for moving fluid from a source located at a lower elevation to a higher elevation and then either returning the fluid to its source or alternatively to a level above its beginning lower elevation comprising: a buoyancy chamber adapted for holding and releasing a fluid; a variable volume chamber adapted for holding and releasing a fluid, the chamber being located above the buoyancy chamber and comprising an upper section and a lower section connected to one another by a flexible membrane; the lower section of the variable volume chamber comprising a movable weighted lower component upon which the effect of gravity is greater than the weight of the chamber, when the buoyancy chamber is at least partially free of fluid; the upper section of the variable volume chamber being operatively connected to a source of fluid; means for raising the weighted movable lower component of the variable volume chamber into an elevated position inside the buoyancy chamber; means for releasing fluid from the buoyancy chamber, whereby gravity acting upon the movable weighted lower component of the chamber pulls the weighted lower component down into the buoyancy chamber, thereby creating a vacuum in the variable volume chamber which draws fluid from the fluid source up into the flexible membrane of the variable volume chamber; and means for releasing fluid from the variable volume chamber into the buoyancy chamber, thereby floating the weighted movable lower component inside the buoyancy chamber and raising the variable volume chamber to an elevated position.