Multimedia-compatible rotary union

A multimedia-compatible rotary union for transferring fluid media from a stationary machine part into a rotating machine part, in particular suitable both for compressible media and for incompressible media of different viscosities, comprising:

• a stationary housing part for installation in the stationary machine part, and comprising a media main channel into which fluid media can be introduced in a pressurized manner,
• a rotor for connection to the rotating machine part and having a rotor fluid channel, which is fluidically connected to the media main channel of the stationary housing part,
• a mechanical seal between the stationary housing part and the rotor, wherein the mechanical seal comprises a rotor seal ring that rotates together with the rotor, and a stator seal ring, wherein the stator seal ring or the rotor seal ring is fastened to an axially movable seal ring carrier, by which an axially movable seal ring assembly is formed, wherein a pressure of a medium in the rotary union exerts a first axial force component on the axially movable seal ring assembly, which axial first force component has a closing effect on the mechanical seal, and
• a tensioning device which acts on the axially movable seal ring assembly and which is activated by the medium pressure in the multimedia-compatible rotary union when the medium pressure in the multimedia-compatible rotary union exceeds a predefined pressure threshold value and which, in the activated state, exerts a second axial force component on the seal ring assembly, which second axial force component influences a closing force of the mechanical seal.