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An assembly can include a valve seat for an exhaust bypass valve of a serial turbocharger system; and a gasket that includes a planar portion that defines a perimeter and that includes a tab that extends from the perimeter of the planar portion for engagement with the valve seat to secure the gasket

An assembly can include a valve seat for an exhaust bypass valve of a serial turbocharger system; and a gasket that includes a planar portion that defines a perimeter and that includes a tab that extends from the perimeter of the planar portion for engagement with the valve seat to secure the gasket to the valve seat. Various other examples of devices, assemblies, systems, methods, etc., are also disclosed.

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1. An assembly comprising: an exhaust gas bypass valve for a serial turbocharger system that receives exhaust gas from an internal combustion engine wherein the exhaust gas bypass valve comprises a valve seat that comprises a peg; anda gasket that comprises a planar portion that defines a perimeter

1. An assembly comprising: an exhaust gas bypass valve for a serial turbocharger system that receives exhaust gas from an internal combustion engine wherein the exhaust gas bypass valve comprises a valve seat that comprises a peg; anda gasket that comprises a planar portion that defines a perimeter and that comprises a tab that extends from the perimeter of the planar portion for engagement with the peg of the valve seat to secure the gasket to the valve seat, wherein the gasket comprises a V-shaped cross-section that comprises an open side that faces radially inwardly from the perimeter. 2. The assembly of claim 1 wherein the valve seat comprises a base portion and a wall portion that extends axially away from the base portion. 3. The assembly of claim 2 wherein the valve seat comprises a shoulder between the base portion and the wall portion, wherein the tab comprises an axially directed portion and a radially directed portion and wherein the radially directed portion of the tab engages the shoulder to secure the gasket to the valve seat. 4. The assembly of claim 1 wherein the peg extends radially outwardly from a base portion of the valve seat and wherein the tab extends axially upwardly from the planar portion of the gasket and comprises an opening to receive the peg. 5. The assembly of claim 1 wherein the gasket comprises a stiffness that accommodates a force of about 8 kN. 6. The assembly of claim 1 wherein the gasket comprises an upper piece and a lower piece. 7. The assembly of claim 6 wherein the upper piece of the gasket comprises a recessed portion, wherein the lower piece of the gasket comprises a recessed portion and wherein the recessed portions define an axial deflection gap for axial deflection between the upper piece and the lower piece. 8. The assembly of claim 7 wherein the recessed portion of the upper piece of the gasket is defined at least in part by a radius, wherein the recessed portion of the lower piece of the gasket is defined at least in part by a radius or wherein the recessed portion of the upper piece of the gasket is defined at least in part by a radius and wherein the recessed portion of the lower piece of the gasket is defined at least in part by a radius. 9. An assembly for a serial sequential turbocharger system that receives exhaust gas from an internal combustion engine, the assembly comprising: a housing that defines an exhaust gas chamber and that comprises a recess;an exhaust gas bypass valve disposed at least partially in the exhaust gas chamber wherein the exhaust gas bypass valve comprises an arm and a poppet;a gasket that comprises a V-shaped cross-section;a valve seat disposed at least partially in the recess of the housing wherein the valve seat comprises an upper surface for seating the poppet of the exhaust gas bypass valve, a lower surface for seating the gasket, and a peg that extends radially outwardly from a base portion of the valve seat that is received by the recess of the housing to orient the valve seat with respect to the housing; anda component coupled to the housing wherein the component comprises an exhaust gas passage and wherein the gasket is disposed between the component and the housing to position the valve seat with respect to the poppet for an orientation of the exhaust gas bypass valve that seals the exhaust gas chamber from the exhaust gas passage. 10. The assembly of claim 9 wherein the housing that defines the exhaust gas chamber comprises a passage to direct exhaust gas from the exhaust gas chamber to an inlet of a volute. 11. The assembly of claim 10 wherein the housing that defines the exhaust gas chamber defines the volute. 12. The assembly of claim 9 wherein the component comprises a recess configured to accommodate a portion of the gasket. 13. The assembly of claim 9 further comprising a V-band wherein the housing that defines the exhaust gas chamber is coupled to the component by the V-band. 14. The assembly of claim 13 wherein the V-band couples the housing that defines the exhaust gas chamber to the component with a force of at least approximately 15 kN. 15. The assembly of claim 9 wherein the gasket comprises an outer perimeter and further comprising another gasket that comprises an inner perimeter that exceeds the outer perimeter of the gasket. 16. The assembly of claim 15 wherein the other gasket comprises a C-ring. 17. The assembly of claim 15 wherein the gasket and the other gasket are formed in part by a unitary piece. 18. The assembly of claim 9 wherein the gasket comprises a tab configured to engage the peg to secure the gasket to the valve seat. 19. An assembly comprising: an exhaust gas bypass valve for a serial turbocharger system that receives exhaust gas from an internal combustion engine wherein the exhaust gas bypass valve comprises a valve seat; anda valve seat gasket that contacts the valve seat and that comprises an opening for flow of exhaust gas,an upper piece that comprises an annular sloped portion that extends to an upper annular planar seating surface that comprises a recess, anda lower piece that comprises an annular sloped portion that extends to a lower annular planar seating surface that comprises a recess,wherein the upper piece and the lower piece are joined such that the annular sloped portions form a V-shaped cross-section that comprises an open end that faces radially inwardly toward the opening,wherein the upper annular planar seating surface and the lower annular planar seating surface define an axial distance, andwherein the recesses define an axial gap that is less than the axial distance to limit axial deflection of the open end of the V-shaped cross-section of the valve seat gasket. 20. An assembly for a serial sequential turbocharger system that receives exhaust gas from an internal combustion engine, the assembly comprising: a housing that defines an exhaust chamber and that comprises a recess that extends axially away from a face of the housing;an exhaust bypass valve disposed at least partially in the exhaust chamber wherein the exhaust bypass valve comprises an arm and a poppet;a gasket that extends axially into the recess, that comprises a V-shaped cross-section, and that comprises an open side that faces radially inwardly from a perimeter of the gasket;a valve seat disposed at least partially in the recess and wholly within the housing wherein the valve seat comprises an upper surface for seating the poppet of the exhaust bypass valve and a lower surface for seating the gasket wherein the gasket positions the lower surface a distance axially away from the face of the housing and into the recess of the housing; anda component coupled to the housing wherein the component comprises an exhaust passage and wherein the gasket is disposed between the component and the housing to position the valve seat with respect to the poppet for an orientation of the exhaust bypass valve that seals the exhaust chamber from the exhaust passage wherein, for the orientation, exhaust pressure applies force via the open side of the gasket to enhance sealing of the gasket.