Dispensing device (OE/A; OE/B; OE/C), connected via a conduit (CA) to a store of liquid CO2 and apt to supply variable flow rates of said liquid CO2 in a use apparatus (UT) operating at a pressure lower than that of its triple point, comprising: a hollow outer body (11; 40) extended along an axis X defining internally at least one hollow part (21; 55-1; 55-2; 56-1; 56-2), provided with a first inlet (14; 43) in order to allow the passage of a flow of CO2 (L+V), coming from said store towards said use apparatus (UT) via an outlet (17), and a mobile component (CM) apt to slide inside said hollow outer body (11; 40) in order to vary the area of the section of passage of the outlet (17) for the flow (L+V) of CO2, acting on said mobile component (CM) a pressure (Pa) of said flow of CO2 (L+V) and a pressure Pu of said use apparatus (UT), as well as a pressure contrary to Pa, characterised in that in said hollow outer body (11) a second inlet (12; 41) is provided for feeding a fluid (G), apt to exert on the mobile component (CM) a pressure Pc contrary to Pa.