| 摘要 |
Provided is a hydraulic circuit for a construction machine, capable of enhancing the effect of reducing a pressure loss due to return oil from a head-side chamber of a hydraulic cylinder, with a simple structure. The circuit includes a hydraulic cylinder (8), a control valve (23), a return pipeline (28), and a tank direct-communication line (33) providing direct communication between the control valve (23) and a tank (T) separately from the return pipeline (28). The control valve (23) has a flow path leading return oil from a head-side chamber (8a) of the hydraulic cylinder (8) to the tank direct-communication line (33) and a flow path leading return oil from a rod-side chamber (8b) of the hydraulic cylinder (8) to the return pipeline (28). |
