Borgwarner Inc.

Jean Armiroli

Jean-Denis Sauzade

Jean-Louis Magnaval

Pascal Audineau

Aime Goubely

Gérard Desaint

Gillian Escandell

Bruno Lhermitte

A pressure relief device usable in a high-pressure fluid circuit for limiting the pressure in the case of a failure of a circuit component is provided, the device includes a body with a pusher sliding therein and axially movable by a spring. A ball seals an orifice connecting a chamber receiving a high-pressure fluid and another chamber. The other chamber includes at least one fluid discharge opening and the ball being held by the spring in a position closing the orifice below a predetermined pressure. The pusher devoid of axial through channels for the fluid, slides in the body and closes at least partially each discharge opening. At least one of discharge openings is connected to an opening also embodied in the body and open at least partially to the opposite side of the pusher.

Pressure relief device

The invention relates to a hydraulic slide valve for controlling flow-rate or pressure comprising at least one movable valve moving from a closed position by contacting a seat and an open position remote therefrom, the displacement of said valve being controlled by a piezoelectric washer.

Hydraulic slide valve provided with a piezoelectric washer

The inventive discharge rate and pressure control solenoid valve () is used for a circuit consisting of a low pressure part and a high-pressure part and controls the discharge rate of a low-pressure fluid with the aid of a sliding spool () in a liner () provided with at least one fluid feeding orifice () and one fluid exhausting orifice () respectively. Said spool () is electrically actuated by means of an electromagnet acting in an opposite direction to recoil means () for closing the passage between the feeding () and exhausting () orifices when a control current for the electromagnet is equal to zero and for gradually opening said passage according to a threshold value of the flow, the pressure control being applicable to a high-pressure fluid. The recoil means () are inserted between the spool () and a flap device which closes an inlet orifice in the liner () of a high pressure fluid and is connected to the low-pressure fluid feeding orifice at least at a slide position corresponding to the control current when it is less than said threshold value. The recoil means () are positioned and dimensioned in such a way that the flap is openable when the current is equal to or near zero in order to drop the pressure in the high pressure circuit.

Discharge rate and pressure control solenoid valve

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Beaulieu-sur-Mer, France

Jean Armiroli