| 摘要 |
<p>PROBLEM TO BE SOLVED: To meet plural type directional control valve with one kind of control valve. SOLUTION: A main valve 12 comprises first to fifth ports 17 to 21, a pilot port X, an external pilot supply passage 23 which is communicated to a pilot supply port (p) of a pilot valve 13, and inner pilot supply passages 24a, 24b and 24c which communicates the first, the fourth and the fifth ports, 17, 20 and 21 to the pilot supply port (p). Check valves 38a to 38d which only allow pressure fluid to run off to the pilot supply port are provided at the pilot supply passages, a valve element 33 of the main valve 12 is driven by pilot fluid supplied and exhausted from a pilot output port (a) of the pilot valve 13, and the second port 18 and the third port 19 are changed over to the first and fourth ports 17, 20 or the fifth port 21 to communicate to each other.</p> |
