| 摘要 |
A pre-assembled valve mechanism (34) for use in valve controlled internal combustion engines and the like (20) which is constructed and arranged to be installed and removed quickly as a unitary module with minimum effort and expenditure of time; the module comprising a cylindrical housing (50) with a valve seat (59) and exhaust port (42a), a headed valve (60), co-operable with the seat (59), a valve guide (65), a return spring (70) and a valve actuating cam follower (80) coaxially mounted in operating position with the housing (50).
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