Abstract: The invention relates to a device for the actuation of the valve of a flush tank: a movable vertical tube (8) carries a valve (7). A linking rod (9) controls the movement of the tube, a lever (12) operates the linking rod, a member (16) operates a rod (15), which in turn controls the lever (12). The rod (15) is connected to the lever (12) and to the operating member (16), the operating member having two positions, one being the opening position (26), and the other one being the closing position (27), and the passage of the member from one to the other one of these positions, controlled by the user, bring about the correlative passage of the valve (7) from one (26") to the other one (27") of the positions and inversely.