| 摘要 |
A method of recirculating exhaust gas flow from an exhaust port to an intake port of an internal combustion engine, and an emission control valve assembly that regulates recirculating the exhaust gas flow. The emission control valve assembly comprises a valve body and a seat. The valve body has a passage that connects a first port to a second port. The passage has a first passage portion that extends from the first port along a first central axis, a second passage portion that extends from the second port along a second central axis, and a third passage portion that extends along a third central axis. The third passage portion connects the first and second passage portions at respective first and second points along the third axis. The seat extends along the third central axis and is located between the first and second points. The seat has a first rim that lies in a first plane oriented orthogonally with respect to the third central axis, and a second rim that lies in a second plane oriented obliquely with respect to the third central axis.
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