| 摘要 |
A method and device for controllably feeding hydraulic oil, wherein a center bypass line (13) which feeds hydraulic oil sequentially to a plurality of throttle valves (28, 15, 16, 29) and a parallel line (14) which feeds hydraulic oil independently to each of the throttle valves (28, 15, 16, 29) are connected to a hydraulic pump (10), one supply line (18) branched from the center bypass line between the throttle valve for swing (15) and the throttle valve for arm (16) and the other supply line (19) branched from the parallel line (14) are connected to the supply port of the throttle valve for arm (16), and a swing priority valve (21) is provided in the other supply line (19), whereby the swing priority valve (21) pilot-operates the throttle opening sequentially through a pressure reducing valve (31) which controllably reduces an output pressure (P1) according to an increase in a pressure of a remote controller which operates the throttle valve for swing (15).
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