Directly controlled fuel injection device for a reciprocating internal combustion engine

A fuel injection device for a reciprocating internal combustion engine, having a nozzle part (5) with an injection nozzle (13), which part has a pressure chamber (10) in which the nozzle needle (9) that closes the injection nozzle (13) is guided, which needle is movable in the opening position upon imposition of pressure by the fuel to be injected, wherein the pressure chamber (10) communicates via a connecting channel (6) with a control part (7) which has a valve chamber (21), into which the connection to channel (6) on the one hand and a high-pressure channel (8), communicating with a fuel supply (4), on the other hand for discharging, and in which a valve body (23) acting as a piston system is guided, which body is kept in the closing position on a valve seat (22) by a valve spring (24), and having an actuator (20), which is operatively connected to the valve body (23) and which moves the valve body in the opening direction upon activation and enables the flow from the high-pressure channel (8) into the connecting channel (6), and having a compensation piston (25;

• 42) which is acted upon counter to the force action of the actuator via the pressure in the connecting channel (6).