Injector for injecting fluid

Injector (1) for injecting fluid with a valve assembly (3) comprising a valve body (5) and a valve needle (7), the valve needle (7) comprising an armature retainer (15), being coupled in a fixed way to the valve needle (7), the valve needle (7) being operable to prevent and to enable injection of fluid. The injector further comprises an electromagnetic actuator assembly (19), operable to exert a force for influencing a position of the valve needle (7) and comprising in turn a pole piece (21) and an armature (23), the pole piece (21) being positionally fix with the valve body (5), the armature (23) being operable to be axially displaced relative to the pole piece (21) and to take along the armature retainer (15) when being displaced towards the pole piece (21), wherein a hydraulically effective restriction is formed in at least a range of an axial displacement of the valve needle (7), the hydraulically effective restriction effecting a first damping force being exerted on the valve needle (7).