Twin check valve pump system having fail-safe characteristic

Details Twin check valve pump system having fail-safe characteristic Twin check valve pump system having fail-safe characteristic

A - Human Necessities

61

M

128/82

A61M 1/00 (2006.01) A61M 5/36 (2006.01) A61M 39/24 (2006.01) F04B 49/24 (2006.01) F04B 53/06 (2006.01)

Patent

CA 1070585

TWIN CHECK VALVE PUMP SYSTEM HAVING FAIL-SAFE CHARACTERISTIC Inventor: Robert A. Virag ABSTRACT OF THE DISCLOSURE A twin check valve pumping system for use with a syringe or other variable volume pumping device for the pumping of liquids. Along a flow path between the check valves, a porous, hydrophobic member is positioned, in communication with a portion of the flow path upstream of the first, inlet check valve. The second, downstream out- let check valve is biased so that pressure in the conduit between the check valves is required for expulsion of li- quid. When gas enters the system, such pressure cannot be achieved, because, upon attempted pressurization of the area between the two check valves, the gas passes through the porous, hydrophobic member hack to a position upstream of the first, inlet valve. However, aqueous liquids cannot pass through the porous member, and accordingly the device pumps such liquids normally in the absence of gas.

263566

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