Abstract: The device comprises an electromagnet with a coil (2) and an armature (3) mobile by the action of the magnetic flux produced by the coil (2). The armature (3) is slidingly housed in a seat (6) in a guide body (4) and is preferably hollow, it being guided on a portion of a pin (11) which penetrates into the seat (6) and is fixed to the guide body (4). The pin (11) can comprise variously arranged channels (14-18) which can be connected together or closed by the armature (3) when in its various positions, to hence form various types of electrohydraulic valves. The compact structure and the minimum masses involved result in a high frequency response and small electrical operating power. The device can be incorporated into a module which also contains the electronic part for controlling the valve in accordance with a position transducer associated with a control element positioned within the module, the control element being operated to control for example power stages.

Abstract: In a volumetric blade pump for fluid-hydraulic actuation, provided with a blade-bearing rotor and with a stator of annular shape mounted around the rotor, for the closure of the stator, on at least one side of the stator, a couple of plates are provided, of which one, stationary, rigidly constrained at the outside of the stator side, and the other, movable, positioned inside the stator between the stationary plate and the rotor; on both faces of the movable plate the delivery pressure of the pump is active.

Abstract: Volumetric vane pump for fluid-hydraulic drive comprising a stator and a blade-bearing rotor, wherein each blade is pushed against the stator by a respective piston by the action of the delivery pressure of the pump, each piston having a diameter greater than the thickness of the related blade and a thrust axis lying along a symmetrical transverse plane of the blade and in a displaced position relatively to a longitudinal plane of the blade containing the rotation axis of the rotor, in advance relatively to the direction of rotation of the same rotor.

Abstract: A flow-distributing valve unit which is actuated electrically and hydraulically is disclosed, the improvement consisting in a double-acting piston distributor reciprocable in a chamber to which fluid intake and fluid discharge conduits are connected, the fluid intake ducts having fixed throttling passageways whereas variable width passageways are provided for the fluid discharge ducts. The widths of the discharge passageways for the fluid are varied by electromagnetic controls. A flow-distributing valve is integral with the double-acting piston mechanism and is connected with a valve actuator which can either be manual or moved by a servomechanism.