High Quality Common Rail Diesel /Fuel Injector BOSCH Injector Nozzle DLLA150SN739

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 atomised.