| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a hydraulic control device for avoiding the poor responsiveness of the operation of a spool to the operation of a pilot control valve and suppressing the consumed flow amount of pilot fluid even when forming the pilot control valve separately from an amplitude valve. <P>SOLUTION: The hydraulic control device comprises the pilot control valve 20 formed separately from the amplitude valve 10. In a valve case 11, a pilot fluid discharge port 114 is formed in communication with a pressure control valve 119. The pilot control valve 20 is connected to the pilot fluid discharge port 114. The pressure control valve 119 is therefore located on the midway of a pilot fluid distribution passage, not at the terminal end thereof. This actualizes construction such that the communication of a pilot fluid supply chamber 141 with a pressure control chamber 119 can be cut off by the spool 12. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
