an exhaust gas recirculation control valve for preventing carbon and the like contained in the exhaust gas from attaching to the inner wall surface of exhaust gas paths , through which the exhaust gas from an engine of a motor car passes , thus decreasing the diameters of the paths with time . this exhaust gas recirculation control valve is provided in a passageway , through which the exhaust gas from the engine is recirculated into an intake air - fuel mixture , a path being of a frusto - conical shape in cross - section and having a progressively larger diameter toward an exhaust gas inlet is formed upstream of the minimum diameter portion , and the inner diameter of the smallest diameter end of said path being of the frusto - conical shape in cross - section in the vicinity of said minimum diameter portion is larger than the inner diameter of said minimum diameter portion . the path being of the frusto - conical shape in cross - section may be formed of a valve housing separately manufactured of a valve seat .