A. Pilot check valve
Pilot check valve function is to prevent the occurrence of drop (down) on the work equipment (attaccement) when the control valve neutral position. Example usage of this is the pilot check valve on the unit motor grader. Construction and check valve pilot symbols can be seen in the figure 4131 (a) and 4131 image (b) and how to work on the image 4132
Pictures 4131 (a) and (b) Construction and pilot symbol check valve
Figure 4132 How the pilot check valve
B. Orbitrol valve
Orbitroll valve function is as a booster. Its working principle is as follows:
- When given the oil flow, working as iretional ontrol valve
- If not given the flow of oil, can work as a hand pump (hand pump) and directs the oil flow.
Pictures 4132 (a) Construction orbitroll valve
Pictures 4132 (b) The symbol orbitroll valve
Pictures 4132 (b) The symbol orbitroll valve
4132 image (c) The working principle orbitroll valve as a directional control valve.
![clip_image004[1]](http://lh3.googleusercontent.com/-P5ZKigahlj0/VW02vjBuQwI/AAAAAAAAJWM/7-OVm7TpCnM/s1600-h/clip_image00412.jpg "clip_image004 [1]")
Pictures 4132 (d) The working principle as a hand pump valve orbitrol