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A liquid dispensing cartridge pump suitable for dispensing reagent in an automatic system includes a compressible metering chamber suspended from a reservoir bag mounted within a rigid housing. Check valves between the reservoir and metering chamber and at a lower end of a metering chamber are forme

A liquid dispensing cartridge pump suitable for dispensing reagent in an automatic system includes a compressible metering chamber suspended from a reservoir bag mounted within a rigid housing. Check valves between the reservoir and metering chamber and at a lower end of a metering chamber are formed of flexible membranes having apertures which close against conical projections on rigid disks. The reservoir and metering chamber pivot as a compression member squeezes the metering chamber against a back surface.

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[ What is claimed is:] [1.]1. 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

[ What is claimed is:] [1.]1. 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.