Drehschieberventil fuer ein Kraftfahrzeug

The valve has a sealing unit arranged proximate to a rotary body. The sealing unit is arranged with a flexible sealing lip (6) in such a manner that the lip in a closed position of the valve is brought into a position resting against the body by pressurization of a combustion chamber. The sealing unit is provided with an under cut (8), where section of the under cut regions lying near the chamber forms the lip. An independent claim is also included for a method for intake and/or exhaust of gases in an internal combustion engine.