| 摘要 |
<p>PURPOSE: To adjust and control hydraulic consumer in a low energy manner at a low cost. CONSTITUTION: In a hydraulic device, an adjusting pump 15 is driven while a pressure differential is detected through the intermediary of a valve 14 so as to maintain a constant operating pressure drop. The adjusting pump 15 is driven by an a.c. motor 18 which is connected to a power source network so that the speed thereof can be changed by means of a frequency converter 19.</p> |
