Patent ID: 6851629

Claim:
A fuel injector for a fuel injector system of an internal combustion engine, comprising: a valve-seat member including a valve-seat surface and an injection orifice; a valve needle; a valve-closure member that is mechanically linked to the valve needle and cooperates with the valve-seat surface of the valve-seat member to form a sealing seat; and a turbulence-producing element that is positioned in the valve-seat member downstream from the sealing seat; wherein the turbulence-producing element including a threaded rod; wherein the threaded rod is insertable from a downstream side of the valve-seat member into a bore in the valve-seat member; and wherein a cavity is present downstream from an overflow bore whose diameter is smaller than a core diameter of the threaded rod between an upstream side face of the threaded rod and the valve-seat member, a narrowest flow cross-section of the cavity defining a metering of a quantity of fuel to be injected.