| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic valve system to recover a valve even from a stop due to dust to a normal state with minimizing scratches caused on the valve in the worst case. SOLUTION: A hydraulic valve control system operates a valve through a valve control amplifier 5 according to a valve opening command from a cylinder position controller, operates a hydraulic cylinder according to a valve opening, and feeds back the cylinder position detected by a cylinder position detector to the valve control amplifier 5. The valve control amplifier 5 is provided with a valve alarm detector 35, a valve position monitor 37, a valve operation memory 39 and a return action command operation part 41.
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