Fuel-injection valve

A fuel injector (1) for the direct injection of fuel into the combustion chamber of an internal combustion engine, comprising an actuator (5), which is encapsulated in a first sleeve (4) and sealed from an inner chamber (25) of the fuel injector (1);

• a valve needle (19) actuable by the actuator (5), which includes a valve-closure member (23) cooperating with a valve-seat surface (24) to form a sealing seat;
• and a locking spring (22), by which the valve needle (19) is acted upon in such a manner that the valve-closure member (23), in the non-energized state of the actuator (5), is held in sealing contact at the valve-seat surface (24), wherein, after a gap (17) is closed, the actuator (5) actuates the valve needle (19) via an activating piston (8), and the stiffness of the first sleeve (4) and of the activating piston (8) is dimensioned such that a linear deformation of the first sleeve (4), caused by the fuel pressure applied on the inflow-side end face (29) of the first sleeve (4), is compensated by a linear deformation of the actuator (5) and of activating piston (8), in such a way that the axial breadth of the gap (17) does not change in response to a change in the fuel pressure.