| 摘要 |
<p>The present invention, a volumetric displacement dispenser comprising a cap assembly, which further comprises a air pump/air vent assembly in communication with a volumetric displacement device; a liquid dispensing valve having an outlet connected to a spigot and inlet connected to a liquid discharge tube, which is in contact with the dispensable liquid; and a ported stopper whereby the liquid discharge tube and the volumetric displacement dispenser device are maintained in isolated contact with the dispensable liquid. The fluid in the container, once opened, is sealed with the volumetric displacement dispenser wherein the bulk of the atmosphere over the fluid is evacuated as the volumetric displacement dispenser device is inflated by atmospheric air. A small volume of liquid serves to seal the outlet check valve assembly closed. This serves to create a vacuum effect within the container, so that upon dispensing the liquid, a vacuum is applied to the liquid side of the volumetric displacement dispenser device, which causes it to expand, drawing air into its internal volume in an effort to maintain equilibrium with the atmospheric pressure. As a function of this expansion, air is excluded from the container thereby protecting the contents from oxidation.</p> |
