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Patent Searching and Data


Title:
DIRECT-OPERATED HYDRAULIC SERVO VALVES
Document Type and Number:
WIPO Patent Application WO/2016/155750
Kind Code:
A1
Abstract:
Disclosed is a servo valve comprising a valving element that rotates between different operating positions in order to connect to valve ports by means of grooves in the valving element. the grooves are formed symmetrically in both sides of the valving element, each pair of symmetrical grooves being optionally separated by a stiffening web having holes to allow fluid to flow between the grooves. Control ports are formed between certain edges of the grooves in the valving element and the edges of corresponding grooves in fixed elements adjacent to the valving element and specially designed for this purpose. Flow paths inside the valve are formed by the grooves in the valving element and in the adjacent fixed elements, providing a sufficient flow area. The surface area of each control port is increased by adding a pair of symmetrical holes in both sides of the valving element, thus doubling the control surface area and balancing the components of lateral flow force. Each portion of the valving element is subjected to the same pressure, which provides static balance. The rotary movement provides the control ports with relatively large surface areas with respect to short-stroke rotary or linear actuators. Furthermore, the thin, grooved valving element provides minimum inertia for a high-speed response.

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Inventors:
ELGAMIL, Mohamed Ahmed (7 El Farik Mohamed Ali Fahmi, Nazlet El BatranHaram, Giza, EG)
Application Number:
EG2016/000009
Publication Date:
October 06, 2016
Filing Date:
March 29, 2016
Export Citation:
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Assignee:
SCIENCE & TECHNOLOGY DEVELOPMENT FUND (101 Kasr Al Aini St, Cairo, EG)
International Classes:
F16K11/00; F15B13/04; F16K39/00
Foreign References:
US3207180A1965-09-21
US3768516A1973-10-30
US20050194053A12005-09-08
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