| 摘要 |
<p>A multiple control valve for operating a civil construction machine or the like comprises a valve body, at least two parallel direction change-over plungers assembled in the valve body, by-pass passages and fluid supply passages formed in the valve body and operatively communicated with the plungers for feeding fluid from an external source to the plungers. One of plungers disposed most downstream side of the multiple control valve is provided with inner passages arranged on both sides thereof, a passage crossing the plunger, an axial passage having one end closed and the other end opened towards one of the inner passages, and a lateral port communicated with the inner passage. The crossing passage is communicated with the axial passage at a portion near the closed end thereof. When the most downstream side plunger is displaced from its neutral position in a direction to operate a corresponding actuator for operating a mechanism of the machine in a predetermined direction, the crossing passage intercommunicates with one of the supply passage and the lateral port intercommunicates with the by-pass passage and when the most downstream side plunger and another plunger disposed upstream side thereof are simultaneously displaced in the direction described above, only the connection between the crossing passage and one of the supply passages is established.</p> |
