Patent ID: 6244474
Filing Date: 2001-06-12
Classification: B01L,B05B,B67D,F04B,F16K,G01N

Abstract:
A method of supplying liquid to be dispensed comprising:filling a liquid reservoir with liquid to be dispensed, the reservoir having a metering chamber attached thereto to receive liquid through an inlet from the reservoir, the metering chamber comprising unidirectional check valves at an inlet and an outlet, respectively, of a compressible elastomeric housing, the check valve at the outlet comprising a valve member having an aperture of a first diameter which seats against a valve seat, and a liquid dispensing guidepost extending from the valve seat to assure straight flow of liquid from the outlet, the guidepost having a diameter less than the first diameter;supporting the reservoir on a moving platform with the metering chamber exposed for compression by an external compression member for dispensing liquid from the outlet of the metering chamber;moving the platform to position the metering chamber adjacent to the compression member; andcompressing the metering chamber with the compression member to dispense liquid from the outlet of the metering chamber.