Turbine

Abstract: A turbine comprising a wastegate chamber (28); a turbine housing (12) defining a turbine inlet (14), the turbine housing (12) comprising: a wastegate inlet passageway (30) defining a flow path between the turbine inlet (14) and the wastegate chamber (28), wherein the wastegate inlet passageway (30) comprises a turbine port (38) proximal the turbine inlet (14) and a non-circular valve port (36) proximal the wastegate chamber (28), and a raised rim (52) surrounding the non-circular valve port (36) and conformal to the shape of the non-circular valve port (36), wherein the raised rim comprises a first sealing surface (52); and a valve member (42) comprising a second sealing surface (50), wherein the valve member (42) is moveable between a closed position in which the second sealing surface (50) forms a seal with the first sealing surface (54) to prevent fluid flow along the flow path and an open position in which the second sealing surface (50) is spaced apart from the first sealing surface (54) to permit fluid flow along the flow path.

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