High Quality Common Rail Control Valve Set Assembly F00RJ01865 for Diesel Injector

Influence of Structural Parameters of Needle Valve Coupling on Fuel Injector

1. The influence of the diameter of the needle valve on the injector
The diameter of the needle valve here is the diameter of the sealing cone of the pointer valve. The diameter of the sealing cone will affect the fuel throttling flow area of the injector, which directly leads to the larger the diameter of the needle valve, the lower the throttling effect and the control chamber As the fuel pressure increases, the fuel injection volume and needle valve closing time will increase accordingly, but at the same time, the needle valve opening time will also be correspondingly reduced.
2. The influence of the quality of the moving parts of the needle valve on the injector
The purpose of the quality of the moving parts of the needle valve is to increase the pressure of the pressure regulating spring of the needle valve and push the needle valve to quickly close and seat. When the mass of the moving parts of the needle valve changes within a certain range, the inertial force of the needle valve coupler is still much smaller than the hydraulic pressure and spring force on the needle valve, so it has little influence on the fuel injection characteristics of the injector, and can even ignore its impact
3. Influence of nozzle hole diameter on injector
The change of the diameter of the nozzle hole directly determines the change of the cross-sectional area of the nozzle hole. When the fuel injection pressure is constant, the fuel injection quantity will also change accordingly, and there is a positive correlation. The diameter of the nozzle hole The larger the value, the lower the fuel pressure in the needle valve control chamber, which leads to a longer pressure build-up process of the injector, which directly leads to a corresponding increase in the closing time and closing delay time of the needle valve, which in turn leads to an increase in the fuel injection volume , under the same fuel injection quantity, the oil return quantity will decrease.