Common rail nozzle diesel engine is one of precision parts, the failure it is easy to produce are: needle taper cone with needle valve body wear, needle and needle hole guide surface wear, nozzle expansion needle stuck, orifice obstruction, the injection pressure is too high or too low.
With the gap Common rail nozzle needle and the needle valve body between only 0.002 ~ 0.003 mm. Nozzle shape of the fuel system is a very important parameter, its spray quality, injection form, the state of the fuel and air mixture has a great influence these factors directly affect the engine's emission targets. In recent years, in order to meet increasingly stringent diesel emission requirements, access to better economic performance and emissions performance, Nozzle appeared the following trends:
(1) Increase the injection pressure, especially at low speed condition;
(2) Increase the number of nozzle orifice, reducing the nozzle diameter;
(3) A variable injection rate of fuel, such as pre-injection and the like.
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