| 摘要 |
A stem seal for a poppet valve in an internal combustion engine. The seal is a ring type seal received in a groove formed in the valve stem and in sealing engagement with the inside diameter of a tubular valve guide. In accordance with one aspect of the invention the seal element has a plurality of circumferetial ribs formed on its outer diameter, and in accordance with another aspect a helical rib is formed on the outer diameter.
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