FUEL INJECTOR FOR A GASEOUS FUEL

A fuel injector (1) for a gaseous fuel and having: an injection nozzle (3); a support body (4) with a tubular shape, which is provided with a feeding channel (5) therein, ending in the injection nozzle (3); an injection valve (7); a tubular sleeve (12), which is arranged around an end part of the support body (4), entirely contains the shutter (9) therein, and ends with the injection nozzle (3); and an actuator (6), which is configured to move the shutter (9). An injection duct (14), which is created when the injection valve (7) is in the open position, has a converging initial segment, in which an area of the injection duct (14) progressively decreases from a first maximum value at the beginning of the injection duct (14) to a minimum value, and a diverging final segment, in which the area of the injection duct (14) increases from the minimum value until reaching a second maximum value.