Bosch fuel injector armature F00RJ02517 for Cummins QSB6.7 injector 0445120123

When the Bosch common rail fuel injector doesn’t injection fuel, the return spring presses the needle valve tightly on the valve seat through the armature to prevent oil dripping. When the electromagnetic coil is energized, electromagnetic attraction is generated, which sucks up the armature and drives the needle valve to leave the valve seat. At the same time, the return spring is compressed, and the fuel passes through the needle valve and is ejected from the ring gap or nozzle hole between the needle and the nozzle. When the electromagnetic coil is de-energized, the electromagnetic attraction force disappears. The port position spring quickly closes the needle valve, and the injector stops injecting fuel.