| 摘要 |
<p>Apparatus for controlling the dispensing a concentrate from a container at a predetermined flow rate includes a first container part a first valve part in communication with a volume of concentrate; a second part having a second mating valve part and an outlet opening therein, the second part movable with respect to the first part to selectively move the first and second valve parts with respect to each other by a preselected amount to permit flow of the concentrate from the first part, through the valve parts and out the outlet opening; cams for effecting movement of the first and second parts, the preselected amount with respect to each other; a tube to introduce air at atmospheric pressure into the container when the first and second valve parts are moved apart having a cooperating valve to prevent backflow through the tube when the first and second valve parts are in sealing relationship; and a chamber interposed between the volume of concentrate and the tube having an outlet fixed near the outlet opening, the chamber outlet being of a size which will permit a free flow of air whereby air will escape from the chamber, despite any surface tension existing in the concentrate, to replace concentrate which is dispensed through the outlet opening in such a manner so as to maintain a constant head pressure in the interior of the container.</p> |
