| 摘要 |
The present invention relates to a hydraulic system comprising two thrust cylinders 5 and 6 which actuate the opening leaves 3 and 4, which thrust cylinders 5 and 6 are connected to a water circuit with the pipeline 10 and use the pressure of the mains in order to move, by means of an electric directional control valve 9 of a flow rate limiter 13, and the assembly is directed by remote control. <IMAGE>
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