| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a control valve to be used for maintenance of a hydraulic cylinder and maintenance of a hydraulic cylinder drive circuit. <P>SOLUTION: The control valve includes: a head side control valve 25a provided between a head side passage 23a to be connected to a head side pressure chamber 11a formed in a cylinder body and a head side supply/discharge passage 21 to be selectively connected to a working fluid hydraulic pressure source or a tank; a rod side control valve 25b provided between a rod side passage 23b to be connected to a rod side pressure chamber 11b formed in the cylinder body and a rod side supply/discharge passage 21b to be selectively connected to the working fluid source or the tank; and a bypass passage 27 to connect the head side control valve to the rod side control valve. The head side supply/discharge passage is connected to either the head side passage or the bypass passage via the head side control valve, and the rod side supply/discharge passage is connected to either the rod side passage or the bypass passage via the rod side control valve. <P>COPYRIGHT: (C)2012,JPO&INPIT |
