A control valve for controlling a gaseous volumetric flow rate, in particular a steam volumetric flow rate, having a valve housing, a valve seat, and a valve throttle element which can be moved relative to the valve seat along a movement axis. The valve housing shapes the valve seat, and the movable valve throttle element has a throttle edge region which interacts with the valve seat. The control valve has multiple volumetric flow rate swirl elements which interact with the throttle edge region and which prevent or at least reduce shear layer instabilities in a shear layer between a wall jet region of the gaseous volumetric flow rate and a core flow region of the gaseous volumetric flow rate.