A pressure medium supply device for a tire of a wheel unit, a wheel unit, and a valve arrangement for a rotationally fixed transition of a pressure medium supply device for a wheel unit are provided. The valve arrangement has a housing part through which a pressure medium can flow, a control piston, in particular an axially movable control piston which is received on the housing part, and a discharge element with an outlet for conducting the pressure medium. The housing part and the discharge element are received in a rotatable manner relative to each other. The control piston has a flow channel for the pressure medium, has a force application surface to which the pressure medium can be applied, and can be moved between a disengaged position and an engaged position. A pressure medium line can be established between the housing part and the discharge element in the engaged position.