Device for carrying out a chemical or physical treatment, comprising a frame on which a turntable is arranged rotatably. The reaction vessels are arranged on the turntable, and a different connection between the feed/discharge lines, which are fixedly connected to the frame, and the reaction vessels is constantly provided via a valve assembly. The valve assembly comprises two disks, each provided with ports which are positioned opposite one another in constantly changing positions. In order to minimize the non-operational time, an indexing movement is carried out using the turntable. In the case of relatively large installations, to prevent associated forces from affecting the movement of the valve assembly, it is proposed that the valve assembly be fitted directly on the turntable and that the turntable be driven directly by the motor.