Steam wand for frothing milk

A method for whipping milk with a coffee machine with a steam wand the steam wand comprising:

• a steam conveyance pipe having a steam dispensing nozzle at one end, wherein the steam dispensing nozzle has a non-return valve inside, said non-return valve comprises a valve body having a steam passage channel having a steam inlet end for an inlet of steam coming from said steam conveyance pipe, a steam outlet end for an outlet of steam and a sealing seat positioned between the steam inlet end and the steam outlet end;
• a shutter positioned against the sealing seat in a closed position of the steam passage channel and movable to open the steam passage channel by a flow of steam coming from the conveyance pipe;
• and an elastic element for automatically recalling the shutter in said closed position of the steam passage channel;
• the method comprising:
• generating steam with a steam generator present in the coffee machine and conveying along said steam conveyance pipe the flow of steam having a pressure at least sufficient to exert on the shutter an opening force of the steam passage channel greater than a predetermined elastic force to close the steam passage channel exerted by the elastic element.