Dispensing assembly for automatically adjusting the carbon dioxide level in beer in a draught beer keg

A dispensing assembly for automatically adjusting the carbon dioxide level in beer in a draught beer keg, said dispensing assembly comprising a beer tap to be placed in the outlet opening of the draught beer keg, a tapping cock connected to said beer tap through a hose, a reducing valve communicating with the beer tap and a carbon dioxide compressed air cylinder which in turn communicates with the reducing valve through a pressure hose, characterised in that the reducing valve is formed as a needle/cone valve, the needle with the cone being controlled by a bellows device arranged in the housing of the valve, the bellows device including a closed control gas mixture and in that the reducing valve is directly connected to a gas channel arranged in the housing of the beer tap, and communicates with the interior of the draught beer keg, said control gas mixture at least including carbon dioxide and being selected such that the carbon dioxide-pressure-temperature-relation of the beer in the keg within a predetermined temperature range, preferably 5 to 30° C., coincides substantially with the carbon dioxide-pressure-temperature-curve for beer with a constant carbon dioxide level of R (% by weight) within said temperature range, R being in the range of 0.43 to 0.62% by weight.