Patent ID: 8366401
Filing Date: 2013-02-05
Classification: F04B

Abstract:
1. A system comprising: a pumping chamber forming a loop; a pump inlet in fluid communication with the pumping chamber; a pump outlet in fluid communication with the pumping chamber; a drive piston disposed within the pumping chamber to travel through the loop in the pumping chamber; a recess chamber in fluid communication with the pumping chamber a drive mechanism for moving the drive piston through the loop; and a valve piston disposed between the pump inlet and pump outlet, wherein the valve piston rotates in response to one of the drive mechanism and one or more electromagnets between the pumping chamber and the recess chamber, such that when the valve piston is in the pumping chamber, flow between the pump outlet and pump inlet is substantially occluded, and when the valve piston is in the recess chamber, the drive piston moves in the pumping chamber past the valve piston.