| 摘要 |
<p>A flow control device includes a control valve (30) having a discharge line to be connected to a hydraulic motor (4), a supply line to be connected to a hydraulic pump (1), a first bleed-off control passage (30F) having a line connected to a tank (T0), and a second bleed-off control passage (30J) having a line connected to the tank (T0) through a secondary control valve (5), flow dividing valve (2) provided in the supply line and having a first position (24) for allowing a first desired flow of oil discharged from the hydraulic pump (1) and a second position (2B) for allowing a second desired flow of the oil, and a selector valve (6) operable for the secondary control valve (5) and the flow dividing valve (2) and having a first selection position for closing the secondary control valve (5) and shifting the flow dividing valve (2) to the first position (24) and a second selection position for opening the secondary control valve (5) and shifting the flow dividing valve (2) to the second position (2B).</p> |
