Patent ID: 7464886

Claim:
An electrically operated injector ( 1 ) for feeding a gaseous fuel to a cylinder of an internal combustion engine, comprising: an electromagnetic actuator ( 2 ) configured to act on a discoidal mechanical interceptor member ( 3 ) arranged to free or intercept a passage ( 4 ) for said fuel from a feed conduit ( 61 ) to a delivery conduit ( 5 ) connected to an outlet ( 6 ); and a seal element ( 40 ) positioned between said delivery conduit ( 5 ) and said interceptor member ( 3 ), the seal element ( 40 ) being fixed to the interceptor member ( 3 ) and moving with the interceptor member ( 3 ), wherein the seal element ( 40 ) presents a recess ( 44 ) in an end ( 42 ) of the seal element ( 4 ) which cooperates with an end ( 43 ) of the delivery conduit ( 5 ) when the injector ( 1 ) is deactivated, said end ( 42 ) of the seal element ( 4 ) being annular, and the seal element ( 40 ) is of frusto-conical shape and rests with a tapered end ( 42 ) of the seal element ( 4 ) on the end ( 43 ) of the delivery conduit ( 5 ) when the injector is deactivated and the gas passage ( 4 ) is intercepted by the interceptor member ( 3 ), the seal element ( 40 ) being fixed in a seat ( 50 ) provided in a first face ( 3 B) of the interceptor member ( 3 ) which faces the delivery conduit ( 5 ), the seal element 40 being made of elastomeric material, and the seat ( 50 ) for the seal element ( 40 ) contains a projection ( 58 ) on which said element rests and of which it substantially copies the shape, the projection ( 58 ) presenting an annular shape having an inner wall ( 49 ) and an outer wall ( 59 ), the inner wall ( 49 ) acting as a support for the seal element when urged into closure by the interceptor member ( 3 ) which intercepts the gas passage ( 4 ).