Patent ID: 8002205

Claim:
An injection nozzle for an internal combustion engine, the injection nozzle comprising; a nozzle body ( 16 ) provided with a bore defining a valve seating surface ( 14 ) having a seat cone angle ( S); a valve member ( 10 ) which is moveable within the bore, wherein the valve member ( 10 ) includes an upstream seat region ( 22 ) defining an upstream cone angle ( B), the upstream cone angle ( B) and the seat cone angle ( S) together defining an upstream differential angle (Δl) between them, and a downstream seat region ( 20 , 24 ) defining a downstream cone angle ( A), the downstream cone angle ( A) and the seat cone angle ( S) together defining a downstream differential angle (Δ 2 ) between them, the valve member ( 10 ) further comprising an annular ridge ( 40 ) that includes an upstream ridge region ( 44 ) protruding from the surface of the upstream seat region ( 22 ) and an adjacent downstream ridge region ( 46 ) protruding from the surface of the downstream seat region ( 20 , 24 ), said annular ridge ( 40 ) disposed immediately downstream of the upstream seat region ( 22 ), said protruding annular ridge ( 40 ) defining an annular seating line ( 112 ) at the intersection of the upstream and downstream ridge regions ( 44 , 46 ), said seating line ( 112 ) having a seat diameter, the seating line ( 112 ) being engageable with the valve seating surface ( 14 ) to control fuel injection from the nozzle body ( 16 ).