| 摘要 |
To obtain high availability of an actuator, several drives (9, 10; 9', 10') activated in parallel via separate channels (6, 6') are provided. The drives (9, 10; 9', 10') jointly operate the final control element (3). Each of them is designed in such a way that it can operate the final control element (3) by itself. The invention is used in valve control at the sea bed. <IMAGE>
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