| 摘要 |
In this gate, the valve 15 is connected to a ring 10, fastened to chains 9, by a chain 23 whose length L is less than the distance D separating the ring 10 from the coffer dam 5 when the two lateral chains 9 are tensioned, so that the lifting force, at the start of the opening operation, brings about the raising of the valve 15 and the opening of the balancing gate before the chains 9 are tensioned. <IMAGE>
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