| 摘要 |
PROBLEM TO BE SOLVED: To provide a flushing circuit for a hydraulic cylinder driving circuit and a flushing method in which circuit flushing is performed while protecting precision parts by performing flushing of a reciprocal hydraulic cylinder and within a driving circuit while bypassing a control valve element.SOLUTION: In a hydraulic fluid supply/discharge circuit connecting a tank for a hydraulic fluid, a hydraulic pump 62 generating a working pressure oil and a hydraulic cylinder 10, a control valve element including at least a direction switch valve 43 near the hydraulic pump and a multifunctional valve 30 including a bypass circuit near the hydraulic pump are provided. A detour circuit 50 is provided which is branched from the hydraulic fluid supply/discharge circuit between the multifunctional valve and the control valve element and detours the control valve element. In flushing of the hydraulic cylinder and the hydraulic fluid supply/discharge circuit, the hydraulic fluid contaminated by a contaminant is circulated to the tank while detouring the control valve element through the detour circuit, thereby protecting the control valve element from the contaminated hydraulic fluid. |
