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Abstract

A valve assembly includes a valve housing defining a metering chamber and an elongated stem. The stem is axially movable with respect to the valve housing for dispensing liquid and is rotatable for adjusting the length of the stroke of a piston to thereby select the volume of liquid dispensed with each actuation of the stem. A sliding float member is fitted around the stem within the chamber and is axially slidable with respect to the stem but is locked for rotation with the stem. The lower surface of the sliding float abuts, and floats above the upper surface of the piston, and the lower end of the stem is rotatable within the piston. A spring extends between a prong on the stem and the sliding float for urging the stem axially outward of the container and for urging the piston in a direction which maximizes the volume of the metering chamber such that the spring rotates with the stem and the stem rotates free of the piston.

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First Claim