Patent ID: 7188782

Claim:
A fuel injector ( 18 ) for injecting fuel into a combustion chamber of an internal combustion engine, having a pressure booster ( 3 ) with a booster piston ( 4 ) which separates a working chamber ( 5 ) from a differential pressure chamber ( 6 ) that can be pressure-relieved, the working chamber ( 5 ) being continuously acted on with fuel by means of a pressure source ( 1 , 2 ) a servo-valve ( 22 ), wherein a pressure change in the differential pressure chamber ( 6 ) occurs via actuation of the servo-valve ( 22 ), the servo-valve ( 22 ) having a control chamber ( 36 ) which can be pressure-relieved by means of a valve ( 32 ), operation of valve ( 32 ) thus opening or closing a hydraulic connection ( 21 , 38 ) of the differential pressure chamber ( 6 ) to a first return ( 30 ) on the low-pressure side, the improvement comprising a first sealing seat ( 24 ) sealing a return ( 30 ) on the low-pressure side off from a high-pressure region of the servo-valve ( 22 ) including the control chamber ( 36 ), a first hydraulic chamber ( 37 ), and a second hydraulic chamber ( 38 ), wherein the servo-valve ( 22 ) is actuated by means of the valve ( 32 ) that connects the control chamber ( 36 ) to a second return ( 31 ).