Patent ID: 8499557

Claim:
A wastegate for a turbocharged internal combustion engine system, comprising a wastegate housing having a passage defining a path for the flow of exhaust gases from an inlet end of the passage to an outlet end of the passage, and a valve ( 31 ) mounted to the passage for movement between a closed position wherein said valve is seated in an orifice ( 32 ) and blocks the flow of exhaust gases through the passage and an open position that allows the flow of exhaust gases through the passage, and an actuator controlling the movement of the valve, wherein the valve ( 31 ) includes a horn ( 90 ) extending in the direction of valve closure, wherein said horn has a base diameter and an elevation measured from said base, wherein the elevation of the horn ( 90 ) measured in the direction of valve closure is equal to or greater than one-half the diameter of the base, and wherein movement of said horn from said closed toward said open position progressively de-restricts said orifice.