Patent ID: 7055766

Claim:
A fuel injector comprising: a fuel inlet; a control chamber which communicates with the fuel inlet via a passage and is defined axially on one side by a rod, and on the other side by an end wall having an axial outlet hole; and a fuel metering valve interposed between the rod and an electromagnetic actuator which, when activated by the actuator, moves the rod axially; wherein the metering valve comprises a shutter interposed between the actuator and the wall, which moves along a longitudinal axis with respect to said wall and mates with said wall in a fluidtight manner via a mating device, and wherein the mating device comprises a first surface carried by the shutter and a second surface carried by the end wall, said first and second surfaces extending about the hole facing and parallel o each other and mating by resting one on the other, and wherein the mating device comprises channeling formed about the hole in at least one of the first and second surfaces, and wherein the channeling comprises at least a first annular groove extending continuously about the hole, and wherein the channeling further comprises a second annular groove formed in one of the first and second surfaces and the first annular groove is firmed in an intermediate radial position between said second annular groove and the hole.