Gm Global Technolgoy Operations, Inc.

Mehrnam Sharif-Bakhtiar

Frank Ament

David A Singer

Melvin D Kipp

An exhaust flow control valve operable over high temperature ranges, comprising: a cylindrical flow housing having a cylinder axis and defining a flow passage; a valve plate pivotably mounted within the cylindrical flow housing, wherein the valve plate has a first facing surface, a second facing surface and a perimeter surface and wherein the valve plate has a pivot axis perpendicular to cylinder axis; a first seat extending radially inward from a first approximate 180 degree portion of an inner perimeter of the cylindrical flow housing, wherein the first seat forms a first partial annular surface having a substantially constant width in a radial direction over an entire arcuate length of the first seat and wherein the first seat faces a first direction parallel to the cylinder axis; a second seat extending radially inward from a second approximate 180 degree portion of the inner perimeter of the cylindrical flow housing, wherein the second seat forms a second partial annular surface having a substantially constant width in a radial direction over an entire arcuate length of the second seat, wherein the second seat faces in a second direction opposite the first direction, wherein the first seat is on one side of the pivot axis and the second seat is on another side of the pivot axis opposite the one side, wherein the valve plate has a dosed position at which the first facing surface seats against the first seat and the second facing surface seats against the second seat.

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Lansing, MI, United States of America

Mehrnam Sharif-Bakhtiar