Dosing a liquid
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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May 28, 1991
Grant Date -
N/A
app pub date -
May 23, 1990
filing date -
Jun 19, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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