Patent ID: 8468804

Claim:
An exhaust line for an internal-combustion engine, comprising: a catalyst contained in the exhaust line; a bypass pipe operatively configured to bypass a portion of the catalyst; and a shut-off valve arranged in the bypass pipe and including two valve seats spaced in a flow direction of exhaust gas in the bypass pipe, at least one of the two valve seats being disposed on an inner wall of the bypass pipe, the shut-off valve operating to shut-off the bypass pipe; wherein the flow direction is a same direction as an opening direction of the shut-off valve; wherein a first valve seat of the two valve seats is disposed on the inner wall of the bypass pipe and a second valve seat of the two valve seats is disposed upstream of the first valve seat; wherein the second valve seat is constructed on a ring part, which is axially movably guided on a housing, the ring part being sealed with respect to the housing via a corrugated bellows spring, the corrugated bellows spring being disposed outside of the bypass pipe in a recess of the housing; wherein an inner portion of the shut-off valve is accessible only in a diagnostic space between the two valve seats via a single diagnostic pipe disposed in a housing of the shut-off valve; and wherein a tightness of the shut-off valve is determinable via the single diagnostic pipe.