Abstract text

A beverage dispensing apparatus for enclosing a keg (2) containing a beverage, comprising pumping means (7) for compressing air, and gas transport means (8) for transporting compressed gas from said pumping means (7) to the keg (2) for driving the beverage out of the keg (2) The beverage dispensing apparatus comprises a membrane (10) enveloping a space through which compressed air can pass, whereby oxygen can pass much faster through the membrane (10) than nitrogen can pass through the membrane (10), so that the percentage of oxygen in the gas that is transported to the keg (2) is reduced.