Abstract: The invention concerns a method and a device producing beverages in a beverage making machine, wherein inside a pressure vessel (2) water is stored, carbonated and possibly chilled under pressure and wherein water intended to be fed into the pressure vessel is subjected to an increase of pressure in a water inlet circuit between a feed water intake (11, 12) and the pressure vessel (2). The invention is distinguished in that carbonated water which is discharged from the pressure vessel (2) in a water outlet circuit (10, 11, 12) is subjected to a controlled pressure reduction or decompression in order to counteract excessive loss of carbon dioxide which is dissolved in the water by supplying it to a pressure transfer device so that the pressure of this water together with the pressure in incoming (11, 12) feed water is used to obtain said increased pressure. The invention prevents excessive loss of carbon dioxide which is dissolved in the water.

Abstract: In a method and a device for cooling and carbonating a liquid (20), carbon dioxide intended for carbonating is also used for cooling, the carbon dioxide being brought to expand in a room (4; 7) which is separate from the liquid (20) but which is thermally connected to the liquid. By the invention it is achieved that an ice bank is formed in the liquid in the area which is adjacent to said expansion room (4; 7) whereby is achieved i.a. better cooling control than in previously known devices where the carbon dioxide also is used for cooling.