Ice-pressurized injection device for internal combustion engine i.e. diesel engine, has rigid valve sleeve, and compensation space that is limited by sleeve on one side and by compensation element on another side

摘要

The device (2) has a valve needle (18), and a rigid valve sleeve (21) surrounding the needle such that a valve needle space is formed between the needle and the valve sleeve. A compensation element (24) provided with a flexible region is arranged in the needle space. The needle space is arranged in an injection space (22) that is filled with a liquid i.e. aqueous urea solution, during operation. A compensation space (23) is filled with gas. The compensation space is limited by the sleeve on one side and by the compensation element on another side. A gas tight connection is provided between the compensation element and the sleeve by welding.