A device for foaming a liquid foodstuff, in particular, milk, including a foaming chamber (5), a foodstuff feed line (4), a steam feed line (7), and an air feed line (8) is provided. The foodstuff, steam, and air feed lines are connected in a fluid-conducting manner to the foaming chamber (5). The air feed line (9) includes an air valve (10) that can be controlled by a control unit (9), and the air valve (10) is an intermittent air valve in which, by use of the control unit (9), at least one state with a high air flow and a state with relatively lower air flow and/or with no air flow can be specified selectively. The control unit (9) and air valve (10) have an interacting construction such that the average air flow of the air valve (10) can be controlled by repeated switching between the at least two states of the air valve (10). The invention further includes a method for foaming the liquid foodstuff.
