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A turbocharger wastegate valve assembly comprises a first bypass port communicating with a first portion of an exhaust inlet and a first valve member adapted for engaging and sealing a first valve seat surrounding the first bypass port. The valve assembly further comprises a second bypass port commu

A turbocharger wastegate valve assembly comprises a first bypass port communicating with a first portion of an exhaust inlet and a first valve member adapted for engaging and sealing a first valve seat surrounding the first bypass port. The valve assembly further comprises a second bypass port communicating with a second portion of an exhaust inlet and a second valve member adapted for engaging and sealing a second valve seat surrounding the second port. A shaft supports each valve member for rotation about a shaft axis to lift both the first and second valve members from sealing engagement with the first and second valve seats respectively. The first valve seat is inclined relative to the second valve seat and the shaft has freedom of movement in the axial direction.

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1. A turbocharger wastegate valve assembly comprising: a first bypass port communicating with a first portion of an exhaust inlet;a first valve member engaging and sealing a first valve seat surrounding the first bypass port;a second bypass port communicating with a second portion of an exhaust inle

1. A turbocharger wastegate valve assembly comprising: a first bypass port communicating with a first portion of an exhaust inlet;a first valve member engaging and sealing a first valve seat surrounding the first bypass port;a second bypass port communicating with a second portion of an exhaust inlet;a second valve member engaging and sealing a second valve seat surrounding the second port; anda shaft supporting each valve member for rotation about a shaft axis to lift both the first and second valve members from sealing engagement with the first and second valve seats respectively;wherein: the first valve seat is inclined relative to the second valve seat and the shaft has freedom of movement in the axial direction;the first valve seat lies in a first plane and the second valve seat lies in a second plane; andsaid shaft axis extends in a direction substantially orthogonal to a direction of a line of intersection of the first and second planes. 2. A turbocharger wastegate valve assembly comprising; a first bypass port communicating with a first portion of an exhaust inlet;a first valve member engaging and sealing a first valve seat surrounding the first bypass port;a second bypass port communicating with a second portion of an exhaust inlet;a second valve member engaging and sealing a second valve seat surrounding the second port; anda shaft supporting each valve member for rotation about a shaft axis to lift both the first and second valve members from sealing engagement with the first and second valve seats respectively;wherein: the first valve seat is inclined relative to the second valve seat and the shaft has freedom of movement along the shaft axis limited by abutment formations defined by or secured to portions of the shaft on respective axial sides of a bushing supporting the shaft;the first valve seat lies in a first plane and the second valve seat lies in a second plane; andsaid shaft axis extends in a direction substantially orthogonal to a direction of a line of intersection of the first and second planes. 3. The turbocharger wastegate valve assembly of claim 2, wherein a first abutment formation of the abutment formations comprises a sleeve. 4. The turbocharger wastegate valve assembly of claim 2, wherein a first abutment formation of the abutment formations comprises a lever arm. 5. A turbocharger wastegate valve assembly comprising: a first bypass port communicating with a first portion of an exhaust inlet;a first valve member engaging and sealing a first valve seat surrounding the first bypass port;a second bypass port communicating with a second portion of an exhaust inlet;a second valve member engaging and sealing a second valve seat surrounding the second port; anda shaft supporting each valve member for rotation about a shaft axis to lift both the first and second valve members from sealing engagement with the first and second valve seats respectively;wherein: the first valve seat is inclined relative to the second valve seat and the shaft has freedom of movement along the shaft axis limited by a sleeve and a bushing in a first direction along the shaft axis and limited by an arm and the bushing in a second direction along the shaft axis;the first valve seat lies in a first lane and the second valve seat lies in a second plane; andsaid shaft axis extends in a direction substantially orthogonal to a direction of a line of intersection of the first and second planes. 6. The wastegate valve assembly according to claim 5, wherein the first and second planes are inclined toward one another to form a “V”-shaped structure. 7. The wastegate valve assembly according to claim 5, wherein, the first and second planes are inclined away from one another to form a “Λ”-shaped structure. 8. The wastegate assembly according to claim 5, wherein the valve seats are equispaced from the line of intersection of the first and second planes. 9. The wastegate valve assembly according to claim 5, wherein said shaft axis is substantially parallel to a plane containing a line joining the centres of each bypass port. 10. The wastegate valve assembly according to claim 5, wherein said shaft axis is substantially parallel to a line joining the centres of each bypass port. 11. The wastegate valve assembly according to claim 5, wherein the first valve port and valve member are farther from the shaft than the second valve port and valve member. 12. The wastegate valve assembly according to claim 5, wherein each valve member is secured to a support portion extending laterally from said shaft. 13. The wastegate valve assembly of claim 12, wherein each valve member is mounted to the support member so as to have a freedom of movement. 14. The wastegate valve assembly according to claim 12, wherein each valve member is mounted to a common support. 15. An apparatus comprising: a turbine comprising an exhaust gas net passageway divided into a first portion and a second portion and further comprising a wastegate valve assembly, wherein the wastegate valve assembly comprises:a first bypass port communicating with a first portion of the exhaust inlet passageway;a first valve member engaging and sealing a first valve seat surrounding the first bypass port;a second bypass port communicating with a second portion of the exhaust inlet passageway;a second valve member engaging and sealing a second valve seat surrounding the second port; anda shaft supporting each valve member for rotation about a shaft axis to lift both the first and second valve members from sealing engagement with the first and second valve seats respectively;wherein: the first valve seat is inclined relative to the second valve seat and the shaft has freedom of movement along the shaft axis limited by abutment formations defined by or secured to portions of the shaft on respective axial sides of a bushing supporting the shaft;the first valve seat lies in a first plane and the second valve seat lies in a second plane; andsaid shaft axis extends in a direction substantially orthogonal to a direction of a line of intersection of the first and second planes. 16. The apparatus according to claim 15, further comprising a turbocharger, the turbocharger comprising the turbine. 17. The wastegate valve assembly according to claim 15, wherein each valve member is secured to a support portion extending laterally from said shaft. 18. The wastegate valve assembly according to claim 15, wherein said shaft extends through the bushing supported in a bore through a wall. 19. A turbine comprising an exhaust gas inlet passageway divided into a first portion and a second portion and further comprising a wastegate valve assembly comprising: a first bypass port communicating with a first portion of an exhaust inlet;a first valve member engaging and sealing a first valve seat surrounding the first bypass port;a second bypass port communicating with a second portion of an exhaust inlet;a second valve member engaging and sealing a second valve seat surrounding the second port; anda shaft supporting each valve member for rotation about a shaft axis to lift both the first and second valve members from sealing engagement with the first and second valve seats respectively;wherein: the first valve seat is inclined relative to the second valve seat and the shaft has freedom of movement in a direction along the shaft axis limited by a plurality of abutment formations;the first valve seat lies in a first plane and the second valve seat lies in a second plane;said shaft axis extends in a direction substantially orthogonal to a direction of a line of intersection of the first and second planes;each valve member is secured to a support portion extending laterally from said shaft;each valve member is mounted to a common support; anda first abutment formation of the abutment formations is defined by a lever arm connected to an end of the shaft for rotation thereof, and a second abutment formation of the abutment formations is defined by part of a support member provided for supporting said valve members on said shaft. 20. A turbocharger wastegate valve assembly comprising: a first bypass port communicating with a first portion of an exhaust inlet;a first valve member engaging and sealing a first valve seat surrounding the first bypass port;a second bypass port communicating with a second portion of an exhaust inlet;a second valve member engaging and sealing a second valve seat surrounding the second port; anda shaft supporting each valve member for rotation about a shaft axis to lift both the first and second valve members from sealing engagement with the first and second valve seats respectively;wherein: the first valve seat is inclined relative to the second valve seat and the shaft has freedom of movement in the axial direction; andthe first valve seat lies in a first plane and the second valve seat lies in a second plane, the first and second planes being inclined away from one another to form a “Λ”-shaped structure.