Patent ID: 8191899

Claim:
An apparatus for rotationally fixing a seal ring of a mechanical seal assembly retained at a mounting component to be axially movable, comprising a force transmitting ring retained at the mounting component to be axially movable and a rotation prevention device comprising at least one first engaging member configured to engage with the mounting component and the force transmitting ring in a form-fit manner and at least one second engaging member configured to engage with the force transmitting ring and the seal ring in a form-fit manner, the first engaging member and the second engaging member being circumferentially aligned and being spaced apart along the same circumference, wherein the first engaging member protrudes axially from the mounting component towards the force transmitting ring and is configured to be received in an axial recesses provided in the force transmitting ring with a play, and the second engaging member protrudes axially from the force transmitting ring towards the seal ring and is configured to be received in an axial recess provided in the seal ring with a play.