| 摘要 |
<p>PROBLEM TO BE SOLVED: To miniaturize a device by opening and closing a pump line by a valve member and performing communicating and communicating closing with the pump line for a pilot line by a spool. SOLUTION: When pump discharge pressure of a pump passage 1a becomes higher than second set pressure, pressure of a pilot chamber 15a is prevented from exceeding second set pressure and pilot pressure of a pilot line 14 which is communicated with the pilot chamber 15a is maintained to second set pressure. Conversely, when pilot pressure of the pilot line 14 is going to be lower than second set pressure, pressure of the pilot chamber 15a is prevented from being lower than second set pressure and pilot pressure of the pilot line 14 which is communicated with the pilot chamber 15a is maintained to second set pressure. Thus, a hydraulic control device can be miniaturized because a spool 40 of a pressure reducing valve 15 is incorporated into a valve member 30 of a sequence valve 13 and these sequence valve 13 and the pressure reducing valve 15 are integrally constituted.</p> |
