Abstract: Control device (1) for a valve (2) with a disc (3), comprising a body (4), two seals (5), two openings (7), spacer balls (8), cavities (9) in the inner faces (10) of the body (4) and of the seals (5), and an elastic return member (11) for the seals (5), the disc (3) being able to be moved as a whole and to be deformed in the axial direction, and being capable of assuming three characteristic positions of totally open, closed tight and intermediate, the said control device (1) comprising operation-control means (20), a control member (21), link means (23) comprising, firstly, support means (24) for the disc (3) which pivot about an axis (25) and are integral in rotation with the seals (5), displaceable by pivoting; and, secondly, separate means (26) for operating the disc (3) which are connected to the control member (21) and to the body (4).