Abstract: A vane control unit for a vane pump having reversible control, the pump having a rotor, a rotor shaft and a vane control unit including vane thrusters inserted into housings arranged in the rotor shaft and designed to control the movement of the vanes outside of their respective housings in the rotor. The vane control unit has thrusters, each of the thrusters is adapted to be connected to two diametrically opposed vanes. The thrusters are semi-cylindrical in shape, have a planar surface and are arranged in groups of two so that their axes, each in their planar surface, are concurrent and coplanar. The thrusters are mounted in sliding engagement in respective cylindrical channels perpendicular to the rotational axis of the rotor shaft and form an angular space between them which depends on the number of vanes in the pump.

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.

Abstract: A safety valve for fluids, comprising on the upstream side a first valve member openable to a degree dependent on the fluid throughput, and, on the downstream side, a second fully-opening valve member capable of being closed sharply by return mechanism and coupled to the first clack through mechanical linkage uncoupling of which is controlled by the position of the first valve member which depends on a predetermined minimum flow rate, the uncoupling causing return motion and sharp closure of the second valve member. The safety valve is useful in the delivery of a fluid where said delivery must be stopped if the flow rate of fluid falls under a predetermined limit.