Metering and pumping devices

Details Metering and pumping devices Metering and pumping devices

2007-11-01

2009-08-18

Thompson, Jewel (Department: 2855)

Measuring and testing

Volume or rate of flow

Using differential pressure

Reexamination Certificate

active

07574925

ABSTRACT:
The present disclosure presents several embodiments for metering devices some of which also have pumping capability. The devices utilize one or more pistons located within a cylindrical rotor. As the cylindrical rotor is turned by a suitable torque/power source, a first face of each piston is exposed to an inlet supplying a fluid to be metered. The piston is then moved within the associated channel or bore within the rotor, allowing the volume of the channel to be filled with fluid. The continuing rotation of the rotor then removes the piston from the fluid supply and moves the channel through an angular displacement. The piston is then moved—either through applied power for active pistons or the force of the fluid supply for passive pistons—in the opposite direction, forcing the fluid out of the channel. In this way, a precise amount of fluid can be metered from each channel.

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International Search Report PCT/US07/83373. International filing date Nov. 1, 2007. Date of mailing May 15, 2008.

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