Abstract: A hydraulic valve is adapted to be connected between a pressurized supply line and first and second lines feeding respective first and second circuits with different functions, such as the steering and braking functions of an automobile vehicle. It comprises a first control member adapted to connect the supply line to the first feed line, a two-way distributor device for the second feed line and a second control member adapted to apply to the second feed line a pressure proportional to the force exerted by the user damped by virtue of a dashpot effect.

Abstract: The invention relates to a rotary heat exchanger.Springs 18, or compressed air, housed between the steel rim 2 and the cellular ceramic disk 1, exert a compressive prelateral tightness over about one-third of the surface, for the passing of the cool air of admission. The remainder of the disk is passed through by hot exhaust gases. A gas turbine, in particular for a lorry, wherein the disk 1 is subjected to abrupt accelerations and decelerations.

Abstract: A rotary heat exchanger of the type having a ceramic core surrounded and driven by a ring gear is provided with a compressed air or spring arrangement between the periphery of the core and the ring gear to apply a radial compression force to the core at all times during operation of the exchanger to assist in accommodating abrupt accelerations and decelerations in the rotation of the exchanger.