New Common Rail Injector Accessories Valve Assembly F00RJ02714 for Injector 0445120235

HOW INJECTION NOZZLES WORK: FUNCTIONAL PRINCIPLE

Injection valves provide each cylinder with the required fuel and simultaneously atomize the fuel so that it can burn most effectively in the combustion chamber. Scroll through this page and find out how injection valves work and potential fault symptoms. You will also find useful tips for performing troubleshooting work on injection valves with the engine running and switched off.

The purpose of injection valves is to precisely inject the fuel quantity calculated by the control unit in all engine operating states.

To ensure the fuel is atomized effectively while minimizing condensation losses, a certain engine-specific distance and injection angle need to be observed.

Injection valves are actuated electromagnetically. The control unit calculates and controls the electrical pulses for opening and closing the injection valves on the basis of the current sensor data regarding the engine operating state.

Injection valves comprise a valve body, which houses a magnet winding and a guide for the nozzle needle, and a nozzle needle with magnet armature. When the control unit applies voltage to the magnet winding, the nozzle needle rises up from its valve seat and releases a precision bore hole. As soon as the voltage drops, a spring presses the nozzle needle back onto the valve seat and the bore hole is closed again.

The flow rate when the injection valve is open is precisely defined by the precision bore hole.

In order to inject the fuel quantity calculated for the operating state, the control unit calculates the opening time for the injection valve in a comparison with the flow rate. This ensures that the precise fuel quantity is always injected. The design of the valve seat and the precision bore hole ensure that the fuel is optimally atomized.