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 tank's top part; a discharge valve attached to the tank's 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 inlet valve attached to a tank side near its top part; a modulating valve arranged after the CO2 inlet 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.
