A turbocharger waste gate valve comprising: a housing defining an exhaust gas inlet through which exhaust gases are received, the housing defining a primary flow passage for the exhaust gases and a bypass flow passage that branches off the primary flow passage; a substantially planar, annular valve seat encircling the bypass flow passage; a poppet valve member connected to a swing arm, the swing arm being pivotable about a pivot axis for moving the poppet valve member between a closed position and an open position with respect to the valve seat, the poppet valve member defining a valve member end face that is arranged to confront the valve seat in the closed position of the poppet valve member; and an elastically deformable sealing member formed by sheet metal, the sealing member being arranged to be under compression between the valve seat and the valve member end face when the poppet valve member is in the closed position so as to be elastically deformed into a compressed state, and to be released from said compression so as to return to an uncompressed state when the poppet valve member is in the open position, the sealing member in the compressed state contacting the valve seat about a full circumference thereof and contacting the valve member end face about a full circumference thereof so as to substantially seal any gap between the valve member end face and the valve seat; characterized in that the sealing member is carried on the poppet valve member and has a disk configuration covering at least substantially all of the valve member end face; and wherein the valve member has a back face opposite from the end face and a substantially cylindrical outer face extending between the back face and the end face, and the sealing member has an outer peripheral portion that is bent to extend along the cylindrical outer face and onto the back face so as to affix the sealing member to the valve member without welding. a housing defining an exhaust gas inlet through which exhaust gases are received, the housing defining a primary flow passage for the exhaust gases and a bypass flow passage that branches off the primary flow passage; a substantially planar, annular valve seat encircling the bypass flow passage; a poppet valve member connected to a swing arm, the swing arm being pivotable about a pivot axis for moving the poppet valve member between a closed position and an open position with respect to the valve seat, the poppet valve member defining a valve member end face that is arranged to confront the valve seat in the closed position of the poppet valve member; and an elastically deformable sealing member formed by sheet metal, the sealing member being arranged to be under compression between the valve seat and the valve member end face when the poppet valve member is in the closed position so as to be elastically deformed into a compressed state, and to be released from said compression so as to return to an uncompressed state when the poppet valve member is in the open position, the sealing member in the compressed state contacting the valve seat about a full circumference thereof and contacting the valve member end face about a full circumference thereof so as to substantially seal any gap between the valve member end face and the valve seat;