Control valve for controlling nozzle needle of e.g. common-rail fuel injector, has seal bushing whose external circumferential surface is provided with coding in form of groove and recess arranged at distance to end surface of bushing

摘要

The valve has a stroke-movable valve element arranged in a valve chamber, which is axially pre-tensioned by spring force of a valve spring against a valve seat. The valve element is supplied in a seal bushing, which seals the valve chamber in relation to a low pressure chamber. An external circumferential surface (7) of the seal bushing is provided with a viewable coding in the form of a groove (8) and/or a recess, which is arranged at a distance to an end surface (10) of the seal bushing. The groove is formed as a circular groove in V-shape or trapezoidal cross-sectional shape.