| 摘要 |
PROBLEM TO BE SOLVED: To enable a reduction in cost of a directional control valve despite a configuration for supplying oil to one actuator from two pumps.SOLUTION: A directional control valve 53E for a boom, which is connected to a supply passage 43E for the boom, a first unload passage 31, a second unload passage 32 and a tank passage 35, supplies/discharges oil to/from a cylinder 23E for the boom. The directional control valve 53E for the boom adjusts a flow rate of the oil flowing into the supply passage 43E for the boom from first and second supply passages 41 and 42, by adjusting opening of the first and second unload passages 31 and 32, according to an operation (lever operation) of the directional control valve 53E for the boom. Thus, the flow rate of the oil supplied to/discharged from the cylinder 23E for the boom is adjusted. |
