| 摘要 |
A combustion nailer configured for reducing intake of contaminated air during operation, includes a combustion engine (14) having a cylinder (20) with a piston (22) reciprocating between a prefiring position and a fully extended position, and at least one air port (54, 102) in the cylinder below the fully extended position. The at least one air port is provided with a venting check valve (60) configured so that the discharge volume from the cylinder out the at least one air port is greater than the inflow.
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