Control device for an exhaust gas-conducting section of an exhaust turbocharger

A control device for an exhaust gas-conducting section of an exhaust turbocharger,

• wherein the exhaust gas-conducting section (3) through which a flow can pass comprises at least one duct (4;
• 5;
• 53) through which a flow can pass and which comprises a through-flow opening (7;
• 52) which, with the aid of a closure element (8) of the control device (2), can be fully or at least partially blocked or released, and
• wherein the control device (2) comprises an actuator (10) for moving the closure element (8), and
• wherein the closure element (8) is designed as a poppet valve,
• wherein the closure element (8) can be moved at least into a first position in order to release the through-flow opening (7;
• 52) and into a second position in order to block the through-flow opening (7;
• 52), and
• wherein the closure element (8) can be disposed at least in one of the positions in a wall of the exhaust gas-conducting section (3), and
• wherein the closure element (8) comprises a closure body (11) closing or releasing the through-flow opening (7;
• 52), which closure body comprises an annular section surface (19) on its bottom surface (20) which faces the through-flow opening (7;
• 52), which section surface is designed to correspond to an element seat (14;
• 15;
• 65) formed in the wall, and
• wherein the closure element has a top surface (21) which faces away from the bottom surface (20) and is designed in a profiled manner in order to produce the top surface (21) at least partially corresponding to another element seat (15;
• 14) and to achieve flow-optimized circulation,
• wherein the element seats (14,15) and the section surface (19) as well as the top surface (21) comprise a conical or frustoconical contour, and
• wherein in order to cool the closure element (8) a cooling element (22) is formed at least partially surrounding the closure element (8).