Abstract: The present invention relates to a device for a beverage brewing machine for the heating and emulsification of liquids, in particular for the preparation of the coffee with milk beverage "Cappuccino". The device comprises a pipe and a nozzle succeeding in the lower section to the bore, from the orifice of which nozzle hot steam exits during operation. The nozzle is encompassed by the pipe such that an annular chamber is formed around the nozzle, which chamber is open in the direction of flow. The open end of the annular chamber extends beyond the orifice of the nozzle. Apertures are formed at the pipe at the level of the orifice of the nozzle, through which the air, which is necessary for the emulsification, can enter the annular chamber. Further, rib structure is provided at the pipe which permits a user to keep a defined distance between the orifice of the nozzle and the liquid's surface by visual check.