Valve for an exhaust gas line of an internal combustion engine

A valve for an exhaust gas line of an internal combustion engine, comprising:

• a housing with an inlet opening and an outlet opening and a duct for directing exhaust gases from the inlet opening to the outlet opening;
• a closure body arranged in the duct and fastened in a torque-proof manner to a shaft, the closure body being pivotable about the rotation axis of the shaft and having a closed position in which the closure body separates upstream and downstream sections of the duct;
• two elongated projections arranged on an inner wall of the duct in the region of the closure body, the projections extending in a circumferential direction of the duct, one of the projections being situated in an upstream section of the duct and the other projection being situated in a downstream section of the duct;
• each of the projections having a valve seat pointing in the longitudinal direction of the duct, the two valve seats pointing in opposite directions;
• the closure body having two sealing surfaces arranged on opposite sides thereof, wherein each sealing surface in the closed position of the closure body lies against one of the valve seats and, by pivoting the closure body from its closed position, the sealing surfaces are raised from their respective valve seats;
• a polymer seal arranged on the valve seats, wherein in the closed position of the closure body, the polymer seal is contacted in a sealing manner by the associated sealing surface of the closure body;
• a circumferential surface formed on the shaft or on the closure body and located in a region of an edge of the closure body;
• and
• the polymer seal contacting in a sealing manner at least a region of the circumferential surface facing the upstream section of the duct, wherein the seal in its section lying against the circumferential surface is fastened to the wall of the duct and on pivoting of the closure body slides over the circumferential surface.

A valve for an exhaust gas line of an internal combustion engine, comprising:

• a housing with an inlet opening and an outlet opening and a duct for directing exhaust gases from the inlet opening to the outlet opening;
• a closure body arranged in the duct and fastened in a torque-proof manner to a shaft, the closure body being pivotable about the rotation axis of the shaft and having a closed position in which the closure body separates upstream and downstream sections of the duct;
• two elongated projections arranged on an inner wall of the duct in the region of the closure body, the projections extending in a circumferential direction of the duct, one of the projections being situated in an upstream section of the duct and the other projection being situated in a downstream section of the duct;
• each of the projections having a valve seat pointing in the longitudinal direction of the duct, the two valve seats pointing in opposite directions;
• the closure body having two sealing surfaces arranged on opposite sides thereof, wherein each sealing surface in the closed position of the closure body lies against one of the valve seats and, by pivoting the closure body from its closed position, the sealing surfaces are raised from their respective valve seats;
• a polymer seal arranged on the valve seats, wherein in the closed position of the closure body, the polymer seal is contacted in a sealing manner by the associated sealing surface of the closure body;
• a circumferential surface formed on the shaft or on the closure body and located in a region of an edge of the closure body;
• and
• the polymer seal contacting in a sealing manner at least a region of the circumferential surface facing the upstream section of the duct;
• wherein the seal, in a section which lies between its section lying against the circumferential surface and a section fastened to one of the projections, has a sealing lip extending in axial direction of the circumferential surface, which sealing lip contacts in a sealing manner the circumferential surface and on pivoting of the closure body slides over the circumferential surface.