| 摘要 |
<p>A hydraulic circuit device (2, 20), comprising an electromagnetic proportional valve (6) having a supply position for supplying hydraulic oil to a main engine side, a discharge position for discharging the hydraulic oil from the main engine side, and a stop position for stopping the supply and discharge of the hydraulic oil installed in a hydraulic oil feed passage (5) to a main engine hydraulic circuit (1) to regulate the supply flow and pressure of the hydraulic oil.</p> |
