Buy Pencil Injector 4w7026 fuel nozzle 7000 series for caterpillar
China Lutong Parts Plant
#Buy Pencil Injector 4w7026 fuel nozzle 7000 series for caterpillar#
#Buy Pencil Injector#
# fuel nozzle 7000 series for caterpillar#
#Buy Pencil Injector & 4w7026 fuel nozzle 7000 series for caterpillar#
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). The needle valve moves up immediately, and the sealing cone at the lower end of the needle valve leaves the conical ring band of the needle valve body to open the injection hole, so that the diesel oil is injected into the combustion chamber at a high pressure. When the fuel injection pump stops supplying oil, the pressure in the high pressure oil passage drops rapidly, and the needle valve returns to the position under the action of the pressure regulating spring, and the injection hole is closed. The number of nozzles of the hole type injector is large (generally 1-8), the diameter of the nozzle hole is small (generally 0.2-0.8mm), the injection pressure is high (generally 17-22MPa), and the self-cleaning ability is poor (spraying The hole is easy to coke and block), which has high requirements on the quality of diesel filter. It is suitable for direct injection type combustion chambers with high requirements on spray quality.
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