Abstract: A device is provided for feeding pressurized liquid to a hydraulic circuit of a hydraulic actuation element. The device includes a motor, a flywheel and a positive displacement pump. The positive displacement pump and the flywheel are mounted on a common shaft. The device also includes a flywheel containment structure suitable for retaining the flywheel in the event of accidental breakage, and a motion transmission element. The containment structure rigidly supports a pair of seats for shaft bearings, and a seat for the pump.

Abstract: The present invention relates to a hydraulic circuit and to an apparatus for generating pressure which use a positive-displacement pump provided with a flywheel, one-way valve for discharging the delivery of the pump into a tank, a pilot line for a first valve, delay valve for delaying the opening of the first valve, and second valve for actuating the opening of the first valve by closing the pilot line and connecting the delay valve to the tank and for actuating the closure of the first valve, connecting the pilot line to the delay valve.

Abstract: In a hydraulic circuit a positive-displacement pump has a flywheel. An actuation motor is attached to the positive displacement pump. The pump is capable of directing liquid flow either towards the tank or towards a hydraulic cylinder. The control of flow direction is determined by a first valve which is connected on the output side of the pump in order to discharge the flow of the positive displacement pump either to the tank or to the cylinder. The opening speed of the first valve is controlled. A bistable valve feeds the pilot line of the first valve. A distribution valve, connected with the output side of the pump feeds two pressure lines.

Abstract: A hydraulic device is described which operates with an open hydraulic circuit. The device includes a positive-displacement pump for driving hydraulic fluid. An actuation motor having a flywheel is attached to the positive-displacement pump. A tank for hydraulic liquid is connected via a delivery line to the pump. The pump capable of directing hydraulic fluid flow either towards the tank or towards a hydraulic actuation means. The control of flow direction is determined by a first directional control valve means which is connected on the output side of the pump in order to discharge the flow of the positive displacement pump either to the tank or to the hydraulic actuation means. A method for pressing bodies to be processed is also described.

Abstract: A roller tunnel kiln for firing a drying refractory material advanced along the refractory rotatable rollers includes an upper section comprising a prefiring zone, a firing zone, a first forced cooling zone, a natural cooling zone and a second forced cooling zone. Parallel to the upper section along the length thereof a drying zone is arranged provided with refractory rotatable rollers for advancing movement of the material to be dried. A distributional tunnel is mounted parallel to the drying zone and is connected with the prekiln zone or with the forced cooling zone so that hot gases mixed with cool ambient air are directed into the distributing tunnel provided with openings communicating the latter with the drying zone. The hot gases at drying temperatures are further directed into drying tunnel in the direction opposite to that of the material to be dried.