Exhaust gas recirculation valve

摘要

A valve assembly (10) is disclosed for metering exhaust gas to the intake manifold of an internal combustion engine (12). The valve assembly has a base (14) which includes a passage (44) communicating between the intake manifold (180) and the exhaust manifold (9178) of the engine (12). the passage has a valve seat (52) which is operable with a valve member (94) to meter the flow of exhaust gas through the passage to the intake manifold. An actuator assembly (18) is mounted to the base and is operably connected to the valve member to move the valve member into and out of engagement with the valve seat. The actuator assembly includes a housing (22) having sides (28) a bottom (26) and support members (64) extending from the bottom to position the actuator relative to the base. A stepped extension (76) may extend from the bottom of the actuator housing and extends into an opening (54) in the top of the base to define a sealed passage (80) for the valve stem (92) between the base member and the actuator. The stepped extension may include a bearing (98) to support the valve stem within the actuator and seal against leakage of exhaust gas from the base to the actuator.