| 摘要 |
PROBLEM TO BE SOLVED: To provide an operating machine capable of realizing satisfactory operability even when a load acting on a single rod cylinder is inverted in a closed circuit system and provided with a small-sized flushing valve adapted to a large flow rate.SOLUTION: A flushing valve comprises: a valve body; a spool that can select one of connecting a first channel to a third channel, connecting a second channel to the third channel, and cutting off the first channel, the second channel, and the third channel from one another depending on a position at which an interior of the valve body is disposed; a first liquid chamber which is provided within the valve body, and into which a hydraulic oil from the first channel flows; a first piston pressing the hydraulic oil flowing into the first liquid chamber, and moving the spool to a position at which the second channel is connected to the third channel by a hydraulic pressure of the first liquid chamber; a second liquid chamber which is provided within the valve body, and into which the hydraulic oil from the second channel flows; and a second piston pressing the hydraulic oil flowing into the second liquid chamber, and moving the spool to a position at which the first channel is connected to the third channel by a hydraulic pressure of the second liquid chamber.SELECTED DRAWING: Figure 2 |
