| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a hydraulic circuit capable of allowing a hydraulic actuator to operate within a predetermined range with high accuracy. SOLUTION: The operation in the predetermined range, of the hydraulic actuator 1 is controlled by a proportional valve 4, and the operation excluding that in the predetermined range, of the hydraulic actuator 1 is controlled by a control valve 5. The control valve 5 executes the control by utilizing the control pressure of the proportional valve 4.</p> |
