Patent ID: 9127622
Filing Date: 2015-09-08
Classification: F02K,F15D,F16L,G05D

Abstract:
1. A fluid flow system comprising: an orifice providing a throat having a throat radius, the orifice including entrance and exit ramps adjoining either side of the throat, the entrance ramp providing a smooth approach to the orifice throat, and the exit ramp including an exit ramp surface having a divergent angle of 20-60° and an exit ramp radius adjoining the exit ramp at a location near the throat, the exit ramp radius less than twice the throat radius; a shut-off valve having open and closed positions; a pump fluidly connected to the shut-off valve by a fluid passage, wherein a tube is arranged in the fluid passage, the tube includes the orifice; and wherein the pump is configured to convey a fluid through the orifice in a first direction with the shut-off valve in the open position, the fluid flows from the entrance ramp to the exit ramp in the first direction, and the pump is configured to reverse the flow of fluid through the orifice to a second direction opposite the first direction with the shut-off valve in the closed position.