Abstract: A valve suitable for dispensing effervescent liquids under pressure includes a frusto-conical core member disposed in a similarly configured frusto-conical valve chamber section to both define a restrictive diffusing flow path when the valve is open and the sole pressure seal when the valve is closed. The pressure seal is created along a substantial length of the core member which is preferably made of resiliently compressible plastic to enhance the seal. The outlet spout located downstream of the diffusing flow path is provided with interior baffles to prevent vortical flow and the resulting frothing in the liquid. The valve chamber and components are sloped to assure that all liquid downstream of the seal can flow toward the outlet spout after the valve is closed. Immediately downstream of the diffusing flow path there is a transition path permitting the flowing liquid to expand gradually without cavitation before entering the expanded downstream end of the valve chamber.

Abstract: Carbonated and non-carbonated beverages are selectively dispensed under the driving force of a one time charge of pressurized inert gas inserted into the headspace of the beverage container at the time of bottling/canning. The gas, preferably nitrogen, is inert to the beverage liquid and is pressurized sufficiently to permit dispensing of all of the liquid from the container via a siphon tube. A cap valve seals the container and includes an elastomeric check valve preventing escape of gas while permitting the siphon tube to be inserted into the container. A throttling and diffusing valve controls outflow from the siphon tube to ambient and prevents fracturing of gas from the beverage liquid to minimize foaming/frothing.

Abstract: Carbonated and non-carbonated beverages are selectively dispensed under the driving force of a one time charge of pressurized inert gas inserted into the headspace of the beverage container at the time of bottling/canning. The gas, preferably nitrogen, is inert to the beverage liquid and is pressurized sufficiently to permit dispensing of all of the liquid from the container via a siphon tube. A cap valve seals the container and includes an elastomeric check valve preventing escape of gas while permitting the siphon tube to be inserted into the container. A throttling and diffusing valve controls outflow from the siphon tube to ambient and prevents fracturing of gas from the beverage liquid to minimize foaming/frothing.