DISCHARGE RATE AND PRESSURE CONTROL SOLENOID VALVE

摘要

The inventive discharge rate and pressure control solenoid valve (1) 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 (18) in a liner (22) provided with at least one fluid feeding orifice (20) and one fluid exhausting orifice (21) respectively. Said spool (18) is electrically actuated by means of an electromagnet acting in an opposite direction to recoil means (26) for closing the passage between the feeding (20) and exhausting (21) 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 (26) are inserted between the spool (18) and a flap device which closes an inlet orifice in the liner (22) 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 (26) 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.