| 摘要 |
A hydraulic system driving working rollers, consisting of a hydraulic pump powered with an electric motor, which supplies power to a hydraulic engine driving working rollers, and an overflow valve stabilizing pressure in accordance with the rated power of the electric motor, characterised in that it is equipped with a cut-off element (6) which allows that overflow valve (5) to be cut off, and an overflow valve (7) stabilizing pressure in accordance with the instantaneous maximum power of the motor (2).<IMAGE>
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