Patent ID: 6213348
Filing Date: 2001-04-10
Classification: F04F

Abstract:
A system for pumping a single liquid under a substantial pressure comprising a source (20) of liquid, a chamber (10) having a first orifice (11) for receiving liquid from said source, a vent (14) opening while said liquid is being received in said chamber, a second orifice (12) for discharging liquid from said chamber and from said system, said vent (14) closing while said liquids is being discharged from said chamber and from said system, a third orifice (13) opposite said second orifice for introducing pressurized gas into said chamber under said substantial pressure, valve means (15, 16, 17) at each orifice, control means for synchronizing said valves in two phases, a first of said phases being a fill phase with a first of said valves being open at the first orifice and with second and third of said valves closed at said second and third orifices, respectively, and a second of said phases being an emptying phase with said second and third valves open at said second and third orifices, respectively, and with said first valve at said first orifice closed, and discharge means for introducing pressurized gas under said substantial pressure through said third orifice during said second phase for forcing said liquid from said system responsive to said substantial pressure.