| 摘要 |
A device for protecting an open gas channel (12) comprises a central core (26) having a first core section (30) and an annular flexible seal lip (28). The latter extends from the first core section (30) and resiliently pressed against a cylindrical wall (32) of the open gas channel (12). Gas pressure acting in a first direction (14) resiliently deforms the seal lip (28) so as to space its annular outer edge (54) from the cylindrical wall (32) and enable gas flow through the annular passage (34). The central core (26) has a plug like second core section (36, 36', 36'') that is designed to be mounted like a plug directly into the open gas channel (12) to centrally position and axially fix the central core (26) therein. This second core section (36) includes passages (42) for the gas, which are in communication with the annular passage (34).
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