Device for controlling the fluid volume in shape adjustment elements of seats

The control device is inserted between a fluid pressure source (13) and the seat shape adjustment elements (11), with a slider valve (16) for supplying the fluid to the latter or venting fluid from the seat shape adjustment elements. The slider valve has a control slider (19) with an axially displaced slider (22) moved within the housing (17) of the slider valve under control of a slider rod (23) for controlling connection openings (18) for each of the seat shape adjustment elements.