New Injector Nozzle F00vx40029 for Fuel Injector 0445116004 0445116005 0445116029 0445116030 for Diesel Engine

The needle valve coupling is one of the three precision couplings of the diesel fuel injection system. It is often worn by high speed, high pressure and impurity particles in the fuel during work, resulting in a decrease in sealing performance. The lubrication of the needle valve coupling belongs to boundary lubrication, and the oil film is very thin. Under the action of external load, the actual contact area of the convex peak on the surface of the needle valve coupling is much smaller than the apparent contact area, so the actual average contact stress is much larger. The metal surface of the needle valve coupler is in direct contact because the oil film is discontinuous in some parts. When the needle valve continues to reciprocate, the temperature continues to rise and cause the contact parts to stick, tear, stick again, and tear again. The plunger couple has the greatest influence on the fuel supply system of the diesel engine, the fuel injector has the middle influence, and the oil outlet valve has the least influence. The sealing state of the needle valve assembly has a direct impact on the fuel injection volume, oil return volume and fuel injection pressure of the fuel supply system. The cylinder in the upper half of the needle valve is the sealing and guiding section, which mainly plays the role of sealing and guiding. The sealing surface of the oil film is worn and the sealing state is deteriorated, which will increase the leakage of the coupling parts, reduce the circulating oil supply, and reduce the injection pressure, etc., thereby reducing the stability of the diesel engine at idle speed and reducing the output torque.