Rotary valve

A rotary valve comprising:

• a housing which has at least one inlet connection and at least one outlet connection for a liquid and/or gaseous medium,
• at least one valve element which is rotatably mounted in the housing, between the connections, to set at least one desired flow cross-section,
• a control shaft which is non-rotatably connected to the valve element,
• wherein the control shaft is led out of the housing with a coupling end through an opening in a housing wall of the housing,
• wherein the control shaft has an annular projection which has an axial stop for axial contact with an annular sealing projection of the housing wall, and with at least one sealing element acting between the control shaft and the housing,
• wherein the annular projection is continuous in a circumferential direction,
• wherein a chamber is formed between the annular projection, the control shaft, the housing wall, and the sealing projection, in which chamber the sealing element is located,
• wherein the control shaft protrudes into the sealing projection with an axial projection protruding axially from the annular projection in order to limit the chamber,
• wherein an outer diameter of the axial projection is smaller than a diameter of the sealing projection so that a gap remains therebetween,
• wherein the annular projection comprises an end face facing the sealing projection,
• wherein the annular projection has at least one axial recess extending in an axial direction into the annular projection away from the annular sealing projection from the end face into a bottom surface within the annular projection, and
• wherein the at least one axial recess extends over a circumferential section of the end face up to the radial outer edge of the annular projection and up to the axial projection so that the medium can reach the chamber.