Hydraulic valves with integral seals

F - Mech Eng,Light,Heat,Weapons – 16 – K

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F16K 11/07 (2006.01)

Patent

CA 2661148

A hydraulic valve comprises a plurality of ports, which communicate with a passageway (5), and a valve member (8) movable in the passageway to control the communication between the ports. The valve member carries a lateral shear seal (13) which is integral with the valve member and engages the passageway. In one position, the valve member (8) isolates a first port (9) from a second port (10). In another position of the valve member, the shear seal (13) communicates with the first port (9) and provides communication between the first port (9) and the second port (10) by way of a passage (14) within the valve member. The valve member has first and second portions (8a, 8b) of different effective cross-section areas and on each portion an integral sealing member (16, 17) makes a radial seal between the valve member and the passageway (5). A supply port (11) supplies pressure to the outside of the valve member so as to produce by virtue of the different cross-sectional areas a force tending to move the valve member (8) towards a closed position.

Soupape hydraulique comprenant une pluralité d'orifices, qui communiquent avec un passage (5), et un élément de soupape (8) mobile dans le passage pour contrôler la communication entre les orifices. L'élément de soupape porte un joint de cisaillement latéral (13) qui fait partie intégrante de l'élément de soupape et entre en prise avec le passage. Dans une position, l'élément de soupape (8) isole un premier orifice (9) d'un second orifice (10). Dans une autre position de l'élément de soupape, le joint de cisaillement (13) communique avec le premier orifice (9) et assure une communication entre le premier orifice (9) et le second orifice (10) au moyen d'un passage (14) à l'intérieur de l'élément de soupape. L'élément de soupape comprend des première et seconde parties (8a, 8b) de superficies transversales effectives différentes. Sur chaque partie, un élément de joint intégral (16, 17) constitue un joint radial entre l'élément de soupape et le passage (5). Un orifice d'alimentation (12) fournit de la pression à l'extérieur de l'élément de soupape de manière à produire, au moyen des superficies transversales différentes, une force tendant à déplacer l'élément de soupape (8) vers une position fermée.

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