| 摘要 |
PURPOSE: A joystick pilot valve is provided to soft the operation of a boom or a bucket of a construction machine with an actuator, and to reduce safety accidents and noise due to jolting. CONSTITUTION: A joystick pilot valve comprises a valve body including a returning hole(105), first to fourth holes(111,113), a hole, a hydraulic oil discharge chamber(120), and a hydraulic oil feeding chamber(121). A hydraulic oil returning port(T) formed in the bottom center of a valve body is connected to the returning hole and vertically penetrates through the valve body. The first to fourth holes are radially formed in the outside around the returning hole. The holes are respectively connected to first to the fourth ports at the bottom of the valve body. A hydraulic oil feeding port(P) feeding from an auxiliary pump is communicated to the hole. |
