| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To improve the interlocking of pumps with a specified actuator by feeding a working fluid to the specified actuator from both a first pump and a second pump even when any of the first actuator which receives the supply of the working fluid from the first pump and the second actuator which receives the supply of the working fluid from the second pump. <P>SOLUTION: A control valve 16 incorporates a plurality of spools of a first group which receive the supply of a working fluid from the drive pump 12 and a plurality of spools of a second group which receive the supply of the working fluid from the idle pump 13. A solenoid selector valve device 27 changes over the pilot line of the tool control spool 16at2 of the second group in a communicating state when the operation of the spool is detected by a first pressure switch 28, and the pilot line of the tool control spool 16at1 of the first group in a communicating state when the operation of the spool is detected by a second pressure switch 29. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
