| 摘要 |
An EGR valve device includes a housing having an exhaust gas passage formed inside, a support shaft slidably supported within the housing through a bearing, a valve disposed on the support shaft to open and close the exhaust gas passage, an urging member for urging the support shaft in a direction to close the valve, a valve seat, insert-cast integral with the housing, for closing the exhaust gas passage by abutting against the valve, and an actuator for driving the support shaft in a direction to open the valve, wherein a plurality of recesses or projections are provided axisymmetrically or uniformly in the peripheral portion of the valve seat to be insert-cast.
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