Patent ID: 7896260

Claim:
A two-stage fuel injector comprising: two valves arranged in series and biased towards closed positions, said two valves including a primary valve arranged on a primary fuel path and a secondary valve arranged on a secondary fuel path, the primary fuel path and the secondary fuel path branching downstream of the primary valve, inner body in which the secondary valve slides and which delimits the primary path, the primary path surrounding the inner body, wherein the secondary path comprises a central cavity of the secondary valve and at least one hole passing radially through the secondary valve between a periphery and the central cavity, at least one orifice passing through the inner body between the primary fuel path and the secondary valve and opening into the hole and immediately downstream a solid portion of the secondary valve when the secondary valve is in the closed position, and wherein said orifice is closed off by the secondary valve as soon as said secondary valve is displaced when the secondary flow is established so that an enrichment of a mixture delivered by said injector ceases.