DEVICE FOR FOAMING MILK

The invention relates to a device for foaming milk, comprising a tubular steam lance with an open end, which faces downwards, for inserting into a milk vessel; a steam generator which is connected to the steam lance via a steam line; a Venturi nozzle which is arranged in the steam line and into which an air supply line opens; and a valve assembly which is arranged upstream of the Venturi nozzle in the steam line for opening and closing the steam line. The aim of the invention is to improve such a device. This is achieved in that the air line is provided with an electrically actuatable air valve which limits an air flow suctioned via the Venturi nozzle to a volumetric flow that can be adjusted via the air valve on the basis of a control signal. Preferably, the air valve is designed as a synchronized air valve which opens and closes on the basis of a periodic switch signal in order to generate a pulsed air flow with an average volumetric flow. An electric control circuit is provided for generating the periodic switch signal, wherein a frequency and/or a duty ratio of the periodic switch signal can be adjusted in order to adjust the average volumetric flow.