Patent ID: 7954787

Claim:
A fuel injector with a balanced metering servovalve, for an internal combustion engine, said servovalve controlling a control rod movable along an axial cavity for opening/closing an injection nozzle, said servovalve comprising: a valve body integral with an axial guide stem and defining a control chamber axially delimited, on one side, by an end surface of said control rod and, on the other side, by a bottom surface of said control chamber, and radially delimited by a tubular portion of said valve body; said valve body provided with a calibrated inlet and an outlet passage for fuel both in fluid communication with said control chamber; said outlet passage comprising: a) an axial segment starting from said bottom surface of said control chamber; b) at least one substantially radial segment starting from said axial segment and exiting through a lateral surface of said axial guide stem; and c) a calibrated segment arranged at a distance from said substantially radial segment; an electro-actuator; a shutter carried by a sleeve controlled by said electro-actuator and coupled in a fluid-tight manner with said axial guide stem in order to axially slide between a closed position and an open position, respectively for closing and opening said substantially radial segment, to control the axial movement of said control rod; said tubular portion and said axial guide stem formed as a single piece; said valve body having a seat starting from said bottom surface and coaxial with said axial segment; said calibrated segment arranged in an element separate from said valve body and housed in fixed position in said seat of said valve body.