Fuel injector

A fuel injector comprising:

• a control valve which controls fuel pressure in a control chamber, the control valve comprising:
• a valve seat;
• a valve member having a valve face for cooperating with the valve seat to control fuel pressure in the control chamber;
• a return line for returning fuel from the control chamber;
• an armature connected to the valve member, the armature being disposed in an armature chamber;
• an actuator for actuating the armature;
• and
• a deflector disposed in the armature chamber which forms a first sub-chamber and a second sub-chamber, the first sub-chamber and the second sub-chamber being in fluid communication with each other via at least one first aperture;
• wherein, in use, a pressure differential is established between the first sub-chamber and the second sub-chamber when the valve face lifts from the valve seat promoting the flow of fuel from the second sub-chamber into the first sub-chamber through the at least one first aperture,
• wherein the at least one first aperture is configured to establish communication between radially inner ends of the first sub-chamber and the second sub-chamber,
• wherein the at least one first aperture is disposed proximal to the valve seat,
• wherein the at least one first aperture has a radial width in the range 0.0325 mm to 0.2825 mm inclusive.