Fuel injection valve

The valve, especially a servo valve of a fuel injector, has an axially movable valve component (10), the free end section of which in the closed position of the valve has a profiled section (30) which extends into or through a passage (25) in the valve body (15). The profiled section is positioned inside the passage in such a way that in dependence upon its profile and lift of the valve component in the passage a variable through-flow section is opened. Independent claims are also included for the following: (A) an injector, especially for diesel engines, with the aforesaid servo valve; and (B) a fuel injection system, especially a common rail fuel injection system.