common rail injector 0445110293 common rail injector for Great Wall ISDE

common rail injector 0445110293 common rail injector for Great Wall ISDE


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  Hole type injector The hole type injector consists of needle valve, needle valve body, ejector pin, pressure regulating spring, pressure regulating screw and injector body. The most important of these is the needle valve and the needle valve body (generally called the injector or the fuel injection head) made of high-quality bearing steel, which are collectively referred to as needle valve couplers. When the injector is working, the high-pressure diesel oil pumped by the fuel injection pump enters the injector through the oil pipe joint, and then enters the annular high-pressure oil chamber in the middle of the needle valve body through the oil inlet passage on the injector body. The oil pressure acts on the pressure cone surface of the needle valve, forming an upward axial thrust on the needle valve. When the thrust is greater than the preload pressure of the pressure regulating spring and the friction between the needle valve coupler (this force is very small).
 

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