HYDRAULIC SERVO VALVE / PROPORTIONAL DISTRIBUTOR WITH A MAIN SLIDE POSITION HAVING AUTO-FEEDBACK AND REGULATING APERTURES WHICH ARE CLOSED WHEN THE REGULATING STAGE IS IN THE CENTRE POSITION

WIPO Patent Application WO/2014/111096

A1

The invention concerns a two-stage hydraulic servo valve, the regulating control member of which is a stem disposed inside the main control member, which is the main slide. The valve is suitable for medium to high flow rates and can thus replace proportional distributors or servo valves having two or more stages. In the regulating stage of the valve, the apertures are closed in the centre position. The opening of the regulating apertures is brought about as a result of the control stem pivoting on its axis or linearly in the direction of its axis, whilst their closure is brought about by the displacement of the main slide, which enables the auto-feedback position of the main slide to be supplied. The design of the valve is such that it can be used with common torque motors with servo valves for control purposes, or conventional low-cost disc electric motors, or also with piezoelectric motors. In addition, the closure of the apertures in the centre position and the use of conventional control methods enables production, operation and maintenance costs to be reduced and the reaction speed and dynamic output to be considerably improved. Finally, the control valve lends itself to all types of assembly and may have apertures which are open in the centre position.

ELGAMIL MOHAMED AHMED (EG)

PCT/EG2014/000005

July 24, 2014

January 16, 2014

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SCIENCE & TECHNOLOGY DEV FUND (EG)

F15B13/043

US5697401A	1997-12-16
US5186213A	1993-02-16
US3472281A	1969-10-14
US3721266A	1973-03-20

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