A variable pressure device to solubilize carbon dioxide (CO2) in a beverage includes: a carbonation tank, a CO2 inlet valve and a venting valve attached to the tanks top part a discharge valve attached to the tanks bottom part a booster pump arranged immediately after the discharge valve a recycling valve arranged immediately after the booster pump, which is connected to a recycling inlet at the top part of the tank an outlet between the pump and the recycling valve a level sensor arranged on the lid of the tank a CO2 diversion valve attached to a tank side near its top part a modulating valve arranged after the CO2 diversion valve a Venturi attached immediately after the modulating valve a control point arranged between the modulating valve and the Venturi and a beverage inlet valve into the tank attached immediately after the Venturi, which is formed by a pipeline.
