Poclain Hydraulics Industrie

Jean-Pierre Lebrun

Louis B Bigo

Jean-Philippe Raisin

Alain Mangano

Gilles G Lemaire

Jacques Fontaine

Jean-Claude Case

Eric Gest

Vincent Siquier

Gilbert Mahe

Jean-N&ouml;el Pogneau

Patrick Wasielewski

The circuit includes a main pump, a hydraulic motor, two main ducts, a selector for connecting the main ducts to the main pump or to a reservoir or for isolating them therefrom, a boost duct, and two pressure limiters disposed between the main ducts. A relief valve device that can take up a retention position and a relief position in which it connects one main duct () to a relief enclosure can take up its relief position when, with the selector isolating the main ducts from the main pump and from the reservoir, the difference between the pressure in the main duct to which the control duct is connected and a relief pressure higher than the boost pressure changes sign.

Open hydraulic circuit including a relief valve device

The tapping circuit forms part of a main fluid circuit which comprises a hydraulic motor having a preferred operating direction and at least two main pipes suitable for communicating with the cylinder block of the motor and constituting respectively, in said preferred operating direction, a feed main pipe and a discharge main pipe. The tapping circuit comprises a single tapping and removal valve connected continuously via a tapping pipe to that one of said main pipes which, in the preferred direction, serves for discharge purposes. This valve serves to replenish the fluid so as to cool it and/or to flush the internal space of the casing of the motor.

Tapping circuit including a tapping valve for replenishing and/or flushing the casing of a hydraulic motor

A valve device ( ) for at least one hydraulic motor suitable for driving a mass of large inertia. The device includes first and second ducts ( ) serving to be connected to respective ones of the two main ducts (feed or discharge) of the motor, and an auxiliary duct ( ) connected, for example, to a booster duct. The device can have two configurations, depending on which of the main ducts has the higher pressure, in which configurations the main duct at high pressure is isolated, while the main duct at low pressure is connected to the auxiliary duct. The device includes time delay means ( ) suitable for limiting the speed of transition between one and the other of the first and second configurations when the difference between the pressures in the first and second main ducts ( ) changes sign.

Valve device for hydraulic engine for driving a large flywheel mass

This invention relates to a valve device for at least one hydraulic motor adapted to drive a high inertia mass. The device comprises two principal conduits, respectively intended to be connected to the two principal ducts (supply or exhaust) of the motor. It comprises a communication conduit for placing said principal conduits in situation of communication when the fluid pressures in these conduits are substantially equal and for placing said principal conduits in a situation of isolation in which they are isolated from one another when the fluid pressures in these two conduits are different. The device further comprises delaying means adapted to limit the speed of passage between the situation of communication and the situation of isolation. The communication conduit may include a calibrated restriction. Similarly, the delaying means may include calibrated restrictions.

Valve device for a hydraulic motor adapted to drive a high inertia mass

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Monceaux, France

Jean-Pierre Lebrun