Valve assembly for an actuating device

F - Mech Eng,Light,Heat,Weapons – 15 – B

Patent

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Details

F15B 13/042 (2006.01) F15B 15/16 (2006.01) F15B 15/20 (2006.01) F16K 3/24 (2006.01) F16K 25/00 (2006.01)

Patent

CA 2665708

A valve assembly for controlling the flow of pressurized fluid supplied to an actuating cylinder having a piston driven by the pressurized fluid along a stroke path therewithin, the pressurized fluid being applied to alternative driving sides of the piston. The valve assembly comprises a first and a second valve pistons, which cooperate to block the supply of pressurized fluid to the current driving side of the piston when the piston reaches the end of its stroke path, thereby limiting the pressure of the pressurized fluid supplied to the driving side to a level reduced compared to a pressure level applied to drive said piston. If a leak occurs within the actuating cylinder at the end of the stroke path of the piston, it will be at the reduced pressurized fluid pressure.

La présente invention concerne un ensemble vanne permettant de réguler l'écoulement d'un liquide sous pression alimentant un cylindre moteur comportant un piston entraîné par le liquide sous pression sur une course à l'intérieur du cylindre, le fluide sous pression alimentant des faces d'entraînement en va-et-vient du piston. L'ensemble vanne comporte des premier et second pistons, qui coopèrent pour bloquer l'apport de liquide sous pression à la face d'entraînement courante lorsque le piston atteint l'extrémité de sa course, limitant ainsi la pression du liquide alimentant la face d'entraînement à un niveau réduit comparé à un niveau de pression utilisé pour entraîner ledit piston. Si une fuite se produit dans le cylindre moteur à la fin de la course du piston, elle va se produire à la pression réduite du fluide sous pression.

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