valve when it is closed but is flexed when the valve is opened and supplements the valve spring force during closing of the valve the flexural element also is used to set the valve stroke length equal to the element 39 s thickness a flat tool presses a valve ball into the armature while the ball is seated on a valve seat until the flexural element engages a seat related surface engagement of the tool with the flexural element fixed to the armature assures that the flexural element is in an unloaded flat position when the valve is closed and establishes the valve stroke when the valve assembly and seat are installed in the injector body application_number US 85389301 A description an electromagnetic fuel injector 10 embodying features of the present invention is depicted in fig1 the fuel injector 10 generally includes an injector body 12 a solenoid actuator assembly 14 a valve assembly 16 and a nozzle assembly 18 while the following description is provided with reference to a disk type fuel injector it is readily understood that the broader aspects of the present invention are applicable to other types of fuel injectors in the illustrated construction the injector body 12 is a hollow cylindrical configuration defining a central axis 20 the body 12 further includes an upper solenoid case portion 22 and an enlarged lower nozzle case portion 24 the solenoid actuator assembly 14 is disposed within the enlarged upper solenoid case portion 22 of the injector body 12 the solenoid actuator assembly 14 includes a spool like tubular bobbin 30 that supports a wound wire solenoid coil 32 a magnetic pole piece 36 is slidably received in a central through bore 34 that extends coaxially through the bobbin 30 in addition.