| 摘要 |
A dispensing device includes a first chamber that is longitudinally movable in a second chamber and has an outer surface sealingly contacting an inner surface of the second chamber. An intermediate valve is positioned between an interior part of the first chamber and an interior part of the second chamber. The intermediate valve includes a valve seat plate having at least one opening and a valve flapper plate having at least one flapper for covering the at least one opening in the valve seat plate. The at least one flapper moves to an open position allowing 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 moves to a closed position limiting flow of the liquid product when the first chamber is moved in an opposite second longitudinal direction. |
