Fuel injector for injecting fuel

A fuel injector for injecting fuel at high pressure, the fuel injector comprising:

• a housing (1) in which there is arranged a longitudinally displaceable nozzle needle (10) which, by way of a sealing surface (11), opens and closes one or more injection openings (13) via which the fuel can be ejected;
• a control chamber (20) which can be filled with fuel and which exerts a hydraulic force on the nozzle needle (10) in a closing direction thereof, and
• a control valve (22) by which a pressure in the control chamber (20) can be influenced in that the control valve (22) opens and closes a hydraulic connection of the control chamber (20) to a low-pressure chamber (21), wherein the control valve (22) comprises a magnet armature (23) with an armature disk (24), wherein the magnet armature (23) interacts with a control-valve seat (26) for the purpose of opening and closing the hydraulic connection;
• wherein the magnet armature (23) is guided radially in the housing (1) only at an outer side (33) of the armature disk (24);
• wherein a top side (123) of the armature disk (24) is facing toward an electromagnet (30) and flat;
• wherein a bottom side (223), opposite the top side (123), of the armature disk (24) is flat and parallel to the top side (123);
• and
• wherein the control-valve seat (26) is flat and engages with the flat bottom side (223) of the armature disk (24) such that the bottom side (223) of the armature disk (24) operates as a closing element.