Method for mounting a valve module of a fuel injector

A method of assembling a valve module of a fuel injector for a fuel injection system of an internal combustion engine, the fuel injector including a thin-walled valve sleeve and an electromagnetic actuating element having a magnet coil, an internal pole, an external magnetic circuit part, and a movable valve closing body cooperating with a valve seat assigned to a valve seating body, the valve seating body and the internal pole being arranged in an internal opening in the valve sleeve, and the magnet coil and the magnetic circuit part being arranged on an outer periphery of the valve sleeve, the method comprising the steps of:

• pushing the magnetic circuit part onto the valve sleeve;
• pressing the valve seating body into the internal opening in the valve sleeve in order to widen the internal opening in at least a partial section of the valve sleeve and thereby create a direct interference fit between the valve sleeve and the magnetic circuit part;
• and
• forming a fixed connection between the valve sleeve and the magnetic circuit part by pressing the valve seating body into position.