Patent ID: 6698717
Filing Date: 2004-03-02
Classification: F02D,F02M,F16K

Abstract:
A butterfly valve assembly for use in an internal combustion engine exhaust gas recirculation system, the valve assembly comprising:a flapper having a terminal edge disposed circumferentially therearound; a valve housing having an annular and a central axis bore disposed therethrough, the flapper being rotatably positioned inside of the bore; a first projection disposed inside of the bore and projecting radially inwardly therefrom; and a second projection disposed inside of the bore and projecting radially inwardly therefrom; wherein the first and second projections are positioned at diametrically opposed positions relative to one another in the bore and extend axially in opposed directions within the bore in a direction of flapper opening movement and wherein the valve housing further comprises a second pair of projections that extend radially inwardly from the annular bore a defined distance from the diametrically opposed positions, and that are configured to make contact with diametrically opposed surfaces of the flapper when placed into a closed position.