Logic valve

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

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137/106

F15B 13/04 (2006.01) F15B 13/01 (2006.01)

Patent

CA 2020924

A main poppet body of a logic valve receives inlet pressure at first and second ends. A flow restricting orifice between the ends produces a differential pressure that maintains a pilot poppet body moveable in the main poppet body in sealing position, normally against a seat in the main poppet body, thereby preventing fluid at the second end from flowing. An external source of controllable pilot pressure acts on the pilot poppet body to permit a flow of inlet fluid from the second end, thereby producing a pressure reduction that tends to move the main poppet body out of its sealing position and consequently to permit an inlet flow past the seat of the main poppet body, to a drain. The position of the main poppet body varies in linear relationship to the pilot pressure applied to the pilot poppet body.

Une pression d'entrée est appliquée au premier et au second bouts du clapet principal d'une soupape logique. Un étranglement réducteur de débit ménagé entre les deux bouts susmentionnés produit une pression différentielle qui assure au clapet pilote la possibilité de se déplacer dans le clapet principal vers une position de fermeture normalement contre un siège dans le corps dudit clapet principal, empêchant ainsi l'écoulement du fluide hydraulique par le second bout susmentionné. Une source extérieure de pression pilote réglable agit sur le clapet pilote pour autoriser l'entrée de fluide hydraulique par le second bout, ce qui engendre une baisse de pression qui tend à soulever le clapet principal de son siège principal pour permettre au fluide admis de s'écouler au-delà dudit siège et vers un drain. La position du clapet principal varie proportionnellement à la pression pilote appliquée au clapet pilote.

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