Patent ID: 8661968

Claim:
A device for foaming a liquid foodstuff, comprising: a foaming chamber, a foodstuff feed line, a steam feed line, and an air feed line, the foodstuff, steam, and air feed lines are connected in a fluid-conducting manner to the foaming chamber, a solenoid air valve is provided for the air feed line that is controllable using a control unit, and the solenoid air valve is an intermittent air valve in which at least one opened state with high air flow and one essentially closed state with at least one of a relatively lower air flow or no air flow is specified selectively by the control unit, and the control unit and the solenoid air valve have an interacting construction such that, through repeated switching between the closed and open states of the solenoid air valve, an average air flow of the solenoid air valve is controlled by specifying at least one of a switching frequency in a range from 1 Hz to 50 Hz at which switching is performed between the at least two states of the solenoid air valve or a pulse-duty ratio between the at least two states for production of a specified foam product.