| 摘要 |
The present invention provides a sealing device for sealing a casing comprising: a housing with an outside diameter, a core inside the housing; at least two sealing segments in slidable engagement with the core to change the outside diameter of the sealing device on at least one position of the sealing device; and at least two wedges in slidable engagement with the core and the sealing segments to seal the sealing device against the casing.
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