Manufacturing method of fuel inlet and outlet valve assembly for fuel injection pump

The invention discloses an oil inlet and outlet valve assembly for a fuel injection pump. Oil valve spring; press the inlet valve spring under the inlet valve plate, and the lower end of the inlet valve spring abuts on the shoulder of the upper part of the plunger cavity; the outlet valve assembly adopts the ball valve assembly, including the outlet valve ball and the outlet valve The ball abuts on the hollow outlet valve stem, the side wall of the outlet valve stem is provided with an oil inlet, the outlet valve stem is provided with an outlet valve spring positioning table, and an outlet valve spring is installed in the outlet valve stem. , And the delivery valve spring is in contact with the delivery valve spring positioning table, and a hollow delivery valve spring seat is sleeved on the delivery valve spring in the delivery oil path; the delivery valve stem and the delivery valve spring A valve stem and a movement space of the oil outlet valve spring are arranged between the seats. The invention solves the leakage caused by the excessive sealing surface of the oil valve, reduces the space required for arranging the valve assembly, and improves the volumetric efficiency.

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