Metering pump especially for volatile materials

Details Metering pump especially for volatile materials Metering pump especially for volatile materials

1981-11-19

1984-05-22

Reeves, Robert B.

Dispensing

With discharge assistant

With discharge volume varying means

137539, 141116, 222334, 222380, 222496, B65D 8854, B67D 540

Patent

active

044496508

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.

REFERENCES:
patent: 3302662 (1967-02-01), Webb
patent: 3851801 (1974-12-01), Roth
patent: 3913801 (1975-09-01), Wise et al.
patent: 3976250 (1976-08-01), Bentzinger
patent: 4197875 (1980-04-01), Schieferstein et al.
patent: 4358027 (1982-11-01), Poitras

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