| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a valve device having a regenerative function capable of achieving an operator's intended control over to a hydraulic actuator which can regenerate operations. <P>SOLUTION: The valve device is provided on a hydraulic shovel and comprises a directional control valve 1 for controlling the drive of an arm cylinder 6 and a regenerative valve 30 which can supply the return oil from the arm cylinder 6 to the arm cylinder 6 via the directional control valve 1 by regenerating the oil returned from the arm cylinder 6. In a first oil chamber 35 of the regenerative valve 30 in opposition to the force of a spring 37 which energizes a regenerating valve spool 32, there is a control pressure which slides the regenerative valve spool 32 in the direction of a regenerative release and which is connected with the drive of the arm cylinder 6 is provided and at the same time, another control pressure competing with the above mentioned control pressure is given to the regenerating spool 32, for example, a control pressure imparting means including a passage 45 which imparts a pilot pressure input at the time of operation by the operating device of the arm cylinder 6 and a spring chamber 36 is provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
