Common Rail Injection System

Common Rail Injection System


1. Nozzle needle

2. Thrust piece

3. Injector body

4. High-pressure connection

5. Valve group

6. Valve ball

7. Armature

8. Magnet coil

9. Magnet core

10. Sealing ball

11. Electrical connection

12. Setting shim

13. Valve spring

14. Magnet tightening nut

15. Clamping screw

16. Disk

17. A- choke

18. High-pressure sealing ring

19. Valve plunger

20. Overflow oil

21. Setting disk

22. Nozzle tightening nut

Common Rail Injector
The Common Rail system controls the injection process by means of an extremely fast solenoid valve in the injector. When there is electrical power flowing in the solenoid coil, the anchor of the solenoid valve with valve ball moves upwards and opens the drain restrictor. The fuel return with opened drain restrictor causes the pressure in the control chamber on the control plunger to fall and the nozzle needle opens.
When there is no current on the solenoid coil, the valve springs presses the anchor of the solenoid valve with valve ball downwards again and closes the drain restrictor. This increases the pressure in the control chamber and the nozzle needle is closed by the control plunger. The opening and closing speed of the nozzle needle is determined by the feed restrictor in the control chamber of the injector. The exact injection volume results from the outflow cross section of the nozzle, the duration of opening of the solenoid valve and the fuel high pressure.