Injection valve for use in dosing system for proportioning urea water solution into exhaust line of combustion engine, has component surface whose portion is modified such that component surface abrasively acts with respect to solution

摘要

The valve has component surfaces (3, 4) coming in contact with urea water solution (HWL) during operation of a dosing system. One of the component surfaces is formed as a limiting surface for an injection opening (5), and the other component surface is formed adjacent to the former component surface, where a portion of the latter component surface is modified such that the latter component surface abrasively acts with respect to the urea water solution. Coating (6) of the surfaces is applied by a coating or deposition method. The injection opening is formed in a perforated spray disk (11).