| 摘要 |
The advantageously shrunk-on runner ring(s) (6, 16) seated on an extension (9) of the back disc (2) or an annular projection (10) of the supporting disc (1) is (are) fastened with a thread (7, 17) which runs in the direction opposite to that of the impeller rotation. This results in the runner ring(s) being fastened and, at the same time, secured in such a way as to require no additional elements and/or manipulations and be highly reliable. <IMAGE>
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