Nozzle Needle And Needle Control Spring

The high pressure chamber uses the high fuel pressure to lift the nozzle needle inwards whenever the piezo actuator is energized. When the nozzle needle is lifted the fuel at the high pressure nozzle is atomized and is injected directly into the combustion chamber through 8 spray holes. The needle control spring holds the nozzle needle in a closed position when the piezo actuator is not energized.