| 摘要 |
PROBLEM TO BE SOLVED: To provide a flow rate control mechanism of a hydraulic oil of a control valve for stably controlling a flow rate of the hydraulic oil regardless of load pressure, and capable of improving inching performance of a spool valve in crawling control by controlling the flow rate of the hydraulic oil according to the opening quantity of the spool valve for controlling the flow rate of the hydraulic oil. SOLUTION: This flow rate control mechanism of the hydraulic oil of the control valve is arranged so as to connect a hydraulic cylinder, a hydraulic pump, and a pressure oil tank, and controls a hydraulic circuit. The spool valve V2 is arranged in the control valve V for controlling the flow rate of the hydraulic oil. A pressure compensating valve 2 is arranged for controlling a flow rate of the hydraulic oil according to the opening quantity of the spool valve V2 by applying pressure of the upstream and downstream hydraulic oil of the spool valve V2.
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