Patent ID: 6837450

Claim:
An injector for a fuel injection system for internal combustion engines, the injector comprising a housing ( 1 ), a nozzle needle ( 5 ), a control chamber ( 17 ), a pressure chamber ( 37 ) defined by a pressure shoulder ( 47 ) of the nozzle needle ( 5 ), the control chamber ( 17 ) communicating hydraulically with a fuel inlet ( 19 ) via an inlet throttle ( 21 ), and a control valve ( 23 ) operable to place the control chamber ( 17 ) in communication hydraulically with a fuel return ( 25 ) via an outlet throttle ( 26 ), a 3/2-way valve ( 31 ) with a valve member ( 29 ), the 3/2-way valve ( 31 ), in a first switching position, connecting the pressure chamber ( 37 ) and the fuel return ( 25 ) hydraulically to one another, and in a second switching position, connecting the pressure chamber ( 37 ) and the fuel inlet ( 19 ) hydraulically to one another; the 3/2-way valve ( 31 ) assuming the first or the second switching position as a function of the pressure difference between the fuel inlet ( 19 ) and the control chamber ( 17 ).