| 摘要 |
Valve device, especially for a secondary air system of an internal combustion engine, which produces a fluid connection between an inlet channel and an outlet channel on lifting a valve-closing body from a valve seat comprises in the region of the valve seat at least one element (21) whose shape is changed by certain conditions. Preferred Features: The element extends or vibrates when air flows by and is a piezo generator. The element has a negative thermal expansion coefficient at temperatures below 0degreesC, i.e. it extends as the temperature drops, and is made of a carbon fiber composite. |
