| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic circuit provided with a control valve of a pilot actuation type for controlling pressure oil supply to a hydraulic actuator and a pilot valve for outputting a pilot pressure to the control valve, with improved operability in conducting fine operation. SOLUTION: The hydraulic circuit is provided with an input side pressure reducing valve 11 for reducing a pressure inputted from a pilot hydraulic source 3 to the pilot valve 9, and output side pressure reducing valves 13X, 13Y for reducing a pressure outputted from the pilot valve 9 to the control valve 5, and is so structured that pressure reducing operation of these input side and output side pressure reducing valves is performed on the basis of operation of a work speed changeover switch 16. COPYRIGHT: (C)2004,JPO
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