The Injector Nozzle Needle In A Common Rail Diesel Fuel System Is Closed By

High pressure chamber nozzle 10.

Frasi x le nozze doro. Spray hole 6 each. In a running engine with a cr diesel system what forced hold the nozzle needle seat when the actuator is not energized. The fuel then reaches the injectors filling two spaces one above and one below the needle of the nozzle.

Siemens vdo piezo actuated servo controlled diesel common rail injector for the pcr2 fuel system 1. Figure 1 and figure 2 show several examples of nozzle seat designs that have been used in closed nozzle diesel fuel injectors 219721922195. Fuel injector closed the fuel is fed under pressure from the fuel rail via the fuel feed to the nozzle prechamber and into the control chamber.

Tolerances in nozzle opening pressure for common rail injectors for some applications can be as tight as 1 2194. The piezo actuator is de energized and the orifice for fuel return is closed by means of the spring loaded mushroom valve. When a multi orifice injector nozzle is closed what seals the nozzle assembly from the engine cylinder.

The upper space called control chamber can be vented when a solenoid or piezoelectric valve opens. Tech b says that ehis are used with common rail fuel injection systems. The two forces balance each other out and the needle is kept closed thanks to a spring.

8 injector needle the fuel is fed at high pressure from the fuel rail via the high pressure feed line into the control chamber and the nozzle prechamber.