Abstract: A sealing device for sealing a rod that is moveable movable in a high-pressure chamber of a pressure-resistant housing filled with a liquid medium, between the high-pressure chamber and a low-pressure region. The sealing device includes a sealing cylinder and a sealing ring for statically sealing a first annular gap and which is arranged resting on an outer jacket surface of the sealing cylinder near the high-pressure-side end face. The sealing cylinder has at least one connecting channel extending from its outer jacket surface to an inner jacket surface. The position of the connecting channel is adapted to the material of the sealing cylinder for preventing deformation of the sealing cylinder in an area remote from the press ring.

Abstract: A rotor nozzle includes a carrier element having an axial bore for supplying a pressurized liquid, a nozzle head rotatably mounted thereon and rotatably drivable by a hydraulically generated torque. The nozzle head has at least one laterally emerging removal nozzle in fluid-open communication with the axial bore. The removal nozzle is radially aligned. The nozzle head has at least one laterally emerging, separate drive nozzle extending at a distance from the radial and, depending on the rotational position of the nozzle head, is in communication with the axial bore via a through-bore of the carrier element.

Abstract: A pressure limiting valve for a fluid medium under system pressure, with a valve housing, in which are provided an inlet channel and an outlet channel communicating therewith for the medium, wherein the flowrate of the medium can be regulated by an axially movable valve body, in effective connection with an energy accumulator, and interacting with a valve seat, is so configured that a piston coaxially adjoining the valve body bounds with its lateral surface a throttle gap, which communicates with the inlet channel and can be subjected to pressure directly or indirectly by the energy accumulator.

Abstract: A rotary drive for a hydraulic tool includes a housing; a hydraulic connection on the housing; and a rotatable hollow shaft in the housing, having an axially extending center passage duct and being connected with a nozzle carrier. A sleeve is inserted from a hydraulic connection end of the housing into the passage duct. A seal consisting of at least one separate ring seal rests in a sealing manner on the wall of the passage duct and on the sleeve. A device exerts pressure on the seal.