Metering solenoid valve for a fuel injector

摘要

The metering servo valve (7) comprises a valve body (8), an open/close element (48), and an electromagnet (29), and is housed in a shell (2) of the injector (1). The electromagnet (29) actuates a mobile armature (31) for a travel defined by an arrest element (36), carried by the electromagnet (29), which is housed in a casing (53), fixed in the shell (2) by means of a threaded ringnut (69). Said ringnut (69) is screwed with a pre-set tightening torque on a thread (71) of the shell (2). The casing (53) has a resting surface (59) designed to engage a shoulder (58) of the shell (2). The surface (59) is carried by an area (72) of the casing (53) designed to undergo deformation as a function of the tightening torque of the ringnut (69) so as to enable fine adjustment of the travel of the armature (31).