Patent ID: 7513241

Claim:
A fuel injection valve for intermittent fuel injection into the combustion chamber of an internal combustion engine, having an injection valve seat adjoining a high-pressure fuel chamber, a needle-shaped injection valve member, which on the one hand interacts with the injection valve seat and on the other in the manner of a piston defines a cylinder chamber connected to a control pressure inlet for the fuel at least during the injection sequence, a booster piston acting as a differential piston, which on the control pressure side defines a piston drive chamber, which via a control valve, controlled by means of an electrically activated actuator, can be connected to and separated from the control pressure inlet, and which on the high-pressure side defines a piston output chamber connected to the high-pressure fuel chamber, wherein the control valve is embodied as a flat seat valve and a control valve member is of disk-like design and interacts with a control valve seat, in the area of which an at least approximately annular inlet groove, connected to the control pressure inlet, is arranged.