Metering valve for controlling the shutter of a fuel injector.

摘要

A metering valve including a valve body (56) with a control chamber (61); a pressurized fuel supply conduit (62); and a fuel drain conduit (63). The control rod (8) of the shutter (28) includes an element (74) for hydraulically separating the supply conduit (62) and the drain conduit (63), so that fuel drainage is considerably reduced. The chamber (61) includes a first cylindrical portion (71) in which slides the end of the rod (8) fitted with the element (74); and a second portion (72) coaxial with the first portion (71) and forming an annular shoulder (73) against which the element (74) of the rod (8) is arrested. The supply conduit (62) is located radially at the first portion (71), while the drain conduit (63) is located axially at the second portion (72).