Importance

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Abstract

A dosing pump for metering a predetermined quantity of a displaceable material, usually a solvent-containing fluid substance, per stroke of the pump, comprises a chamber connected by an intake valve with a source of the material and with a discharge valve with a location into which the material is to be dispensed. The chamber is provided with a drive member, e.g. a membrane or piston, preferably actuatable by fluid pressure and, according to the invention, at least one displaceable member whose stroke is such that it corresponds to a displacement of material less than the displacement by the drive member and is effective upon retraction of the drive member to allow the material to recede slightly from the outlet of the pump without re-entering the chamber.

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First Claim