| 摘要 |
A hydraulic circuit for a hydraulic cylinder capable of executing and adjusting a shock absorbing function at the time of stopping the operation of a cylinder piston rod and releasing the function, comprises a damping control valve (v 1 ) having a first switching position (v 11 ) which blocks the connection of the accumulation port ( 22 ) with outside and performs supply and discharge or discharge and supply of the operating oil with respect to the first cylinder chamber ( 3 ) and the second cylinder chamber ( 4 ), a second switching position (v 12 ) connecting at least the accumulation port ( 22 ) and the second cylinder chamber ( 4 ), and a third switching position (v 13 ) connecting at least the accumulation port ( 22 ) and the first cylinder chamber ( 3 ).
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