| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic system for accurately controlling a flow amount. SOLUTION: The hydraulic system 50 comprises an oil tank 51, a hydraulic cylinder 52, a flow-in side pipe 53 in which a hydraulic pump is provided between the oil tank 51 and the hydraulic cylinder 52, and a flow-out side pipe 55 in which a slow return valve (a flow control valve) B is provided between the hydraulic cylinder 52 and the oil tank 51, the slow return valve B being formed by combining a plurality of rotary valves 60, 70 having different opening phases. COPYRIGHT: (C)2006,JPO&NCIPI
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