| 摘要 |
<p>PURPOSE:To make smooth sensing of a load pressure while steep rise of the pump line pressure is suppressed by the use of a relatively simple structure. CONSTITUTION:In two passages 6a, 6b provided in the spool 3 of a direction selector valve, high pressure holes 7a, 7b in the radial direction which are shut by a spool hole wall between bridge ports PA, PB and actuator ports A, B when the spool is in neutral state, and radially stretching low pressure holes 8a, 8b which are leading to a tank port and opened and closed by load check valves 9a, 9b installed in the respective passage, are furnished. One of the passages is equipped near its foremost with a throat 100 and a communication hole 10 leading to a load sensing port LS when the spool is in neutral state, and the other passage is equipped near its foremost with No.1 communication hole and No.2 communication hole leading to the load sensing port even when the spool is in the neutral state.</p> |
