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A sealing arrangement for the sealing-off of metallic cylindrical bodies is disclosed, particularly for shafts in cryogenic valves which are surrounded by an essentially ring-shaped sealing device which cannot be glued to metal. The sealing device is surrounded by a ring which is arranged concentric

A sealing arrangement for the sealing-off of metallic cylindrical bodies is disclosed, particularly for shafts in cryogenic valves which are surrounded by an essentially ring-shaped sealing device which cannot be glued to metal. The sealing device is surrounded by a ring which is arranged concentrically with respect to the shaft, consists of a metal alloy with shape memory characteristics and with a one-way characteristic and the interior shape of which is adapted to the exterior shape of the sealing device and which contracts when the transition temperature is exceeded.

대표청구항 ▼

An arrangement for the sealing-off of metallic cylindrical bodies, particularly shafts in cryogenic valves, the shaft being arranged such that it can be skid coaxially in the axial direction in a cylindrical housing and being surrounded by an essentially ring-shaped sealing device made of a material

An arrangement for the sealing-off of metallic cylindrical bodies, particularly shafts in cryogenic valves, the shaft being arranged such that it can be skid coaxially in the axial direction in a cylindrical housing and being surrounded by an essentially ring-shaped sealing device made of a material that cannot be glued to metal, wherein the sealing device is surrounded by a ring which is arranged concentrically with respect to the shaft and is made of a metal alloy with shape memory characteristics, the interior shape of the ring being adapted to the exterior shape of the sealing device and the crystal structure of the ring being arranged such that, when a transition temperature is exceeded, the ring contracts radially and, as a result, connects the sealing device with the cylindrical housing in a force-locking and form-locking manner, wherein the ring which surrounds the sealing device has an essentially L-shaped cross-section, and wherein an interior wall of the ring which rests against an exterior wall of the sealing device in parallel to an exterior wall of the shaft is provided with several sealing cutting edges, wherein the cylindrical housing has a flange which surrounds the shaft concentrically and which has a collar which projects upward concentrically with respect to the shaft and engages in an adapted recess in the sealing device, and wherein an exterior wall of the collar is provided with at least one sealing cutting edge which, in an axial sectional view, is arranged between two adjacent sealing cutting edges on an interior wall of the ring.