The working principle of fuel injection nozzle, fuel injection pump nozzle accessories manufacturers for you to introduce it:

Before the fuel injection pump starts to supply oil, the injection nozzle needle valve is closed and maintained by the spring. Began its oil pump stroke fuel injection pump, high pressure diesel through into the tubing connector into the nozzle assembly, after a nozzle body oil duct into the needle valve pressure cone cavity around the oil, when diesel pressure to set pressure, oil pressure effect on the needle valve pressure cone upward thrust will make needle valve opening, diesel from under the needle valve called the oil sac, a small oil cavity reach the nozzle, and from the oil mist jet nozzle to finely. When the pump oil pressure decreases, the needle valve spring causes the needle valve to fall on the seat, and the injection process ends.