Valve device

1. A valve device for controlling a bypass of an exhaust-gas turbocharger, comprising:

a valve disc for opening and closing a bypass opening of a turbine, the bypass opening surrounded by a valve seat,

a mandrel protruding on a rear side of the valve disc,

an adjusting lever for pivoting the valve disc, the adjusting lever connected with the mandrel protruding from the valve disc, wherein the adjusting lever has a through opening, which is pierced by the mandrel, and wherein the through opening is radially limited by an interior surface of the adjusting lever, and

at least one spring element arranged in the through opening, wherein the at least one spring element subjects the mandrel to a radial force;

wherein the valve disc is retained in the through opening of the adjusting lever with both radial and axial play; and

wherein at least one of:

the at least one spring element is configured in a C-shaped curved manner; and

the adjusting lever has at least one groove in which the at least one spring element is arranged.

2. The valve device according to claim 1 , wherein:

the at least one spring element has a spring section, which extends within an annular gap disposed between the mandrel and the adjusting lever, and the at least one spring element has such a curved configuration that it is stressed if the mandrel is located in the through opening, and

the at least one spring element has at least one gripping portion, which extends at an angle in relation to the spring section.

3. The valve device according to claim 2 , wherein the spring section extends in a substantially axial direction.

4. The valve device according to claim 2 , wherein the spring section is configured in at least one of a concavely curved shape and a convexly curved shape.

5. The valve device according to claim 2 ,

wherein the spring section abuts against the mandrel when the mandrel is located in the through opening.

6. The valve device according to claim 2 ,

wherein the at least one gripping portion extends in a substantially radial direction.

7. The valve device according to claim 2 , wherein the at least one gripping portion has a front surface surrounding the through opening of the adjusting lever, and wherein the front surface abuts against the adjusting lever.

8. The valve device according to claim 2 , wherein the at least one spring element is configured in an annular shape, and wherein the spring section and the at least one gripping portion are each configured in an annular shape.

9. The valve device according to claim 1 , wherein the at least one spring element is configured as a sheet metal shaped part.

10. The valve device according to claim 1 , wherein the at least one groove on the interior surface of the adjusting lever extends in an axial direction, and the at least one groove merges from the interior surface to a front surface of the at least one gripping portion that surrounds the through opening.

11. The valve device according to claim 1 , wherein the at least one spring element is a separate component with regard to the valve disc and the adjusting lever.

12. The valve device according to claim 1 , further comprising a safety ring axially spaced from the adjusting lever and spring element.

13. A charging device, comprising: a valve device for controlling a bypass of a turbine, the valve device including:

a valve disc for opening and closing a bypass opening of the turbine, the bypass opening surrounded by a valve seat;

a mandrel protruding on a rear side of the valve disc;

an adjusting lever for pivoting the valve disc, the adjusting lever connected with the mandrel, wherein the adjusting lever has a through opening, which is pierced by the mandrel, and wherein the through opening is radially limited by an interior surface of the adjusting lever; and

at least one spring element arranged in the through opening, wherein the at least one spring element biases the mandrel with a radial force;

wherein the at least one spring element is configured in a C-shaped curved manner.

14. The charging device according to claim 13 , wherein the at least one spring element has a spring section that extends within an annular gap defined between the mandrel and the adjusting lever, and wherein the at least one spring element has a curved configuration such that the at least one spring element is stressed when the mandrel is disposed in the through opening.

15. The charging device according to claim 14 , wherein the at least one spring element has at least one gripping portion, and wherein the at least one gripping portion extends at an angle in relation to the spring section.

16. The charging device according to claim 15 , wherein the at least one gripping portion has a front face surrounding the through opening of the adjusting lever, and wherein the front face engages against the adjusting lever.

17. The charging device according to claim 14 , wherein the spring section engages against the mandrel when the mandrel is disposed in the through opening.

18. A method for assembling a valve device, comprising:

providing a valve disc for opening and closing a bypass opening of a turbine, the bypass opening surrounded by a valve seat;

providing a mandrel protruding on a rear side of the valve disc;

providing an adjusting lever for pivoting the valve disc, the adjusting lever connected with the mandrel, wherein the adjusting lever has a through opening, which is pierced by the mandrel, and wherein the through opening is radially limited by an interior surface of the adjusting lever; and

arranging at least one spring element in the through opening, wherein the at least one spring element biases the mandrel with a radial force;

wherein arranging the at least one spring element in the at least one through opening includes inserting the at least one spring element in the through opening and subsequently guiding the mandrel into the through opening; and

wherein the adjusting lever has at least one groove, and wherein the at least one spring element is arranged in the at least one groove.