| 摘要 |
<p>PURPOSE:To enable a counterbalance valve to be eliminated by detecting pressures in the main pipe line of an oil hydraulic motor and correcting an opening signal of a direction selector valve in accordance with the detection value of said pressures. CONSTITUTION:Pressure detectors 10a, 10b are provided in the main pipe line of an oil hydraulic motor 1, and a controller 12, which inputs signals from these pressure detectors 10a, 10b and a signal from an instruction signal generator 11, corrects an opening signal of a direction selector valve 9 in accordance with the signals from the pressure detectors 10a, 10b. In this way, a conventional counterbalance valve can be eliminated selector valve 9 when the oil hydraulic motor 1 performs pumping action.</p> |
