Fuel injector equipped with a metering servovalve for an internal-combustion engine

A fuel injector (1) has an injector body (2) and a control rod (10), which is movable in the injector body (2) along an axis (3) for controlling opening/closing of a nozzle that injects fuel into a cylinder of an engine; the injector body (2) houses a metering servovalve (5) having a control chamber (26), which is axially delimited by the control rod (10) and communicates with an inlet (4) and with a discharge duct (42); the metering servovalve (5) is provided with an open/close element (47), which is axially slidable on an axial guide (38), from which the discharge duct (42) gives out, to open and close the discharge duct (42) and consequently vary the pressure in the control chamber (26); the discharge duct (42) has at least two calibrated restrictions (53, 44) which have calibrated passage sections and are set in series with respect to one another for splitting the pressure drop along the discharge duct (42); the hole or holes that defines/define the last calibrated restriction is/are divergent.