The invention relates to a device (100) for driving a double seat valve (1) having two closing members (3, 4) disposed in series and displaceable relative to each other and preventing, in the closed position of the double seat valve (1), the flow of fluids from a valve housing part (1 a; 1 b) into another (1 b; 1 a) through a connecting opening connecting said valve housing parts of a valve housing (10) with each other, and, even in the open position, bounding a leakage cavity (9) of the double seat valve (1) connected to the vicinity of the double seat valve (1).