Patent ID: 6990952

Claim:
An air amount control valve comprising: a housing; a valve hole formed in the housing; a valve body having a valve surface for changing an open area of the valve hole, thereby controlling an amount of air flowing through the valve hole; a seal wall formed in the housing, the seal wall facing the valve surface with a gap apart from the valve surface; and a fringe wall surrounding the valve hole and projecting from the seal wall toward the valve surface so that the fringe wall slidably contacts the valve surface or faces the valve surface with a small gap apart from the valve surface, the small gap being smaller than the gap between the seal wall and the valve surface, wherein: an anodic oxide film is formed to cover at least an inner surface of the fringe wall that faces the valve surface; and a fluororesin film made of polytetrafluoroethylene mixed with silicone that dries at a room temperature is formed on the anodic oxide film to cover at least the inner surface of the fringe wall.