| 摘要 |
A bridging device for docks. A lifting cylinder is provided for raising a bridge plate, in which is mounted an extension that can be retracted or extended via a feed cylinder. A hydraulic arrangement is associated with the bridging device, and includes a reversible pump. A relief valve that can be hydraulically closed is provided in the return line from the lifting cylinder. The actuating connection of this relief valve is connected to the feed lines for the feed cylinder.
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