Dosing a liquid

Details Dosing a liquid Dosing a liquid

1990-05-23

1991-05-28

Huppert, Michael S.

Dispensing

Processes of dispensing

222309, 222380, 141258, G01F 1100

Patent

active

050191276

ABSTRACT:
A liquid is dosed by an apparatus that has a housing formed with an inlet connected to a supply of the liquid, an outlet, a filling chamber, and a bypass chamber having an outlet side from which the outlet opens and an inlet side connected to the inlet. A pumping piston subdivides the filling chamber into an inlet compartment into which the inlet opens and an outlet compartment. A valve element in the housing can move between a filling position blocking the outlet and connecting the inlet through the bypass chamber with the outlet compartment and a feed position exposing the outlet and blocking flow between the inlet and the outlet compartment through the bypass chamber. The piston is alternately retracted through a back stroke while the element is in the filling position to draw liquid into the outlet compartment from the inlet through the bypass chamber and is advanced through a predetermined advance stroke while the element is in the feed position to eject the drawn-in liquid from the outlet. At least periodically the length of the back stroke is changed while maintaining the advance stroke always of the same length so that the end positions of the piston move and the inlet compartment is flushed.

REFERENCES:
patent: 3168225 (1965-02-01), Miller et al.
patent: 3833155 (1974-09-01), Farfaglia
patent: 3850345 (1974-11-01), Merritt
patent: 3865281 (1975-02-01), Byrd et al.
patent: 4076482 (1978-02-01), Whetstone
patent: 4178929 (1979-12-01), Voegele
patent: 4399932 (1983-08-01), Zimmermann
patent: 4437498 (1984-03-01), Pankratz et al.
patent: 4708269 (1987-11-01), Willerding
patent: 4842026 (1989-06-01), Nordmeyer et al.
patent: 4860926 (1989-08-01), Juenkersfeld et al.

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