Abstract: The invention provides an improved rotating seal apparatus including a plurality of concentrically spaced annular rotating seals. The invention also provides a rotating seal apparatus including a pressurized annular chamber surrounding an annular rotating seal.

Abstract: A sealing arrangement for a direct-controlled cartridge valve in an insertion bore, which valve is arranged in a hydraulic system of a device for varying the valve timing of an internal combustion engine wherein to avoid leakages between the individual annular chambers (20, 21, 22) in the insertion bore (23) resulting from the radial clearance between the annular webs (8, 9, 10) of the cartridge (5) and the bore wall (24) of the insertion bore (23), the annular webs (8, 9, 10) on the outer peripheral surface (6) of the cartridge (5) are made with a smaller diameter than the insertion bore (23) and additionally comprise annular grooves (14, 15, 16) into which annular sealing elements (17, 18, 19) made of a shear-resistant material are inserted, and leakages between the sealing elements (17, 18, 19) and the cartridge (5), as also leakages between the sealing elements (17, 18, 19) and the bore wall (24) of the insertion bore (23) are sealed by a static radial force resulting from the pre-stress of the sealing el