Apparatus for injecting fuel to exhaust gas aftertreatment system of internal combustion engine, has fuel injector and valve holder having cooling water circuit, where compressed air supply is fed through air gap or air channels

摘要

The apparatus has a fuel injector and a valve holder having a cooling water circuit (36), where a compressed air supply (28) is fed through an air gap or air channels (30,32) in the region of an end side (34) of the injection valve. The air gap encloses a valve body of the injection valve. An opening of the air gap lies in a cavity (46), which is limited by a sealing unit (44).