A dispensing assembly for a machine for the preparation of liquid food products, comprising a preparation chamber (7, 8) and a hydraulic circuit configured for supplying water and/or steam to the preparation chamber (7, 8), wherein the preparation chamber (7, 8) is configured for receiving at least one dose of a precursor of a liquid food product and for dispensing the liquid food product following upon passage of water and/or steam through the preparation chamber (7, 8), the dispensing assembly further comprising a pneumatic circuit configured for supplying compressed air to the preparation chamber (7, 8), the pneumatic circuit having a respective pumping means, wherein the preparation chamber (7, 8) has a first inlet in fluid communication with the hydraulic circuit and a second inlet in fluid communication with the pneumatic circuit, wherein the dispensing assembly has a control system pre-arranged for controlling the hydraulic circuit and the pneumatic circuit for supplying compressed air to the preparation chamber (7, 8) after supply of water and/or steam to the preparation chamber (7, 8), wherein the preparation chamber (7, 8) comprises a first chamber part and a second chamber part, at least one chamber part being displaceable relative to the other chamber part between a spaced-apart position, to enable loading of the aforesaid dose into the preparation chamber (7, 8), and a close position, to enable introduction of water and/or steam into the preparation chamber (7, 8) and dispensing of the liquid food product from the preparation chamber (7, 8), one of said chamber parts having associated thereto a dispensing duct for dispensing the liquid food product, wherein the control system is pre-arranged for controlling the hydraulic circuit and the pneumatic circuit so as to supply compressed air to the preparation chamber (7, 8) when the first chamber part and the second chamber part are in the close position, wherein - the preparation chamber (7, 8) is pre-arranged for receiving capsules containing said dose of the precursor of the liquid food product, - the hydraulic circuit has a respective pumping means, for supplying water and/or steam under pressure to the preparation chamber (7, 8), and - the control system is pre-arranged for carrying out a purging step of the preparation chamber (7, 8) and the dispensing duct, by controlling automatically the hydraulic circuit and the pneumatic circuit for supplying compressed air to the preparation chamber (7, 8) after the liquid food product has been dispensed via the dispensing duct. wherein the preparation chamber (7, 8) has a first inlet in fluid communication with the hydraulic circuit and a second inlet in fluid communication with the pneumatic circuit, wherein the dispensing assembly has a control system pre-arranged for controlling the hydraulic circuit and the pneumatic circuit for supplying compressed air to the preparation chamber (7, 8) after supply of water and/or steam to the preparation chamber (7, 8), wherein the preparation chamber (7, 8) comprises a first chamber part and a second chamber part, at least one chamber part being displaceable relative to the other chamber part between a spaced-apart position, to enable loading of the aforesaid dose into the preparation chamber (7, 8), and a close position, to enable introduction of water and/or steam into the preparation chamber (7, 8) and dispensing of the liquid food product from the preparation chamber (7, 8), one of said chamber parts having associated thereto a dispensing duct for dispensing the liquid food product, wherein the control system is pre-arranged for controlling the hydraulic circuit and the pneumatic circuit so as to supply compressed air to the preparation chamber (7, 8) when the first chamber part and the second chamber part are in the close position, wherein - the preparation chamber (7, 8) is pre-arranged for receiving capsules containing said dose of the precursor of the liquid food product, - the hydraulic circuit has a respective pumping means, for supplying water and/or steam under pressure to the preparation chamber (7, 8), and - the control system is pre-arranged for carrying out a purging step of the preparation chamber (7, 8) and the dispensing duct, by controlling automatically the hydraulic circuit and the pneumatic circuit for supplying compressed air to the preparation chamber (7, 8) after the liquid food product has been dispensed via the dispensing duct. - the preparation chamber (7, 8) is pre-arranged for receiving capsules containing said dose of the precursor of the liquid food product, - the hydraulic circuit has a respective pumping means, for supplying water and/or steam under pressure to the preparation chamber (7, 8), and - the control system is pre-arranged for carrying out a purging step of the preparation chamber (7, 8) and the dispensing duct, by controlling automatically the hydraulic circuit and the pneumatic circuit for supplying compressed air to the preparation chamber (7, 8) after the liquid food product has been dispensed via the dispensing duct.