Abstract: A device (10) for producing a heated milk-air emulsion comprises, at the inside thereof, circulation paths for steam, milk and air towards a delivery outlet (11). A blocking means (20) is drivingly slidable to close the delivery outlet (11) and thereby enable execution of an inner-cleaning cycle in the device on activation of steam circulation. Advantageously, the delivery outlet (11) is formed of a duct (25) the free end (26) of which is of tapered shape. Axially disposed inside duct (25) is a dispenser (27) at which the circulation paths arrive and which has radial passageways (28) opening into the duct (25). For accomplishment of the blocking means, the duct and dispenser are axially slidable relative to each other to bring the dispenser (27) to a sealing contact position against the duct (25) thereby closing passage of same to the the outside.