Abstract: A limiter for the filling of a tank with any liquid, comprising a hydraulic valve provided with a monitoring obturator connected to a first arm with a first float included in an arm-control assembly of which a second arm with a second float cooperates with said first arm through a stop and pawl arrangement, the position of the first arm controlling said obturator, the latter comprising a diaphragm acting as well under an impulse from said first arm as by a permanent action. The limiter provides for safe filling of a tank between predetermined levels without any water-hammer and overflow.