| 主权项 |
1. A precise-dosing dispensing device, comprising:
a first chamber and a second chamber, the first chamber being longitudinally movable in the second chamber and having an outer surface sealingly contacting an inner surface of the second chamber; an outlet passage adapted to deliver the liquid product being dispensed by the dispensing device, said outlet passage being fluidly connected to the second chamber; an intermediate valve positioned between an interior part of the first chamber and an interior part of the second chamber, wherein the valve is configured to (a) allow the liquid product to flow from the interior space of first chamber to the interior space of the second chamber when the first chamber is moved in a first longitudinal direction and to (b) limit flow of the liquid product from the interior space of the second chamber to the interior space of the first chamber when the first chamber is moved in an opposite second longitudinal direction to dispense the liquid product from the second chamber through the outlet passage; and a blocking member movable in concert with the first chamber, the blocking member configured to seal the outlet passage when the valve limits flow of the liquid product from the interior space of the second chamber to the interior space of the first chamber. |
