Proportional solenoid-controlled fluid valve having compact...

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

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F16K 31/06 (2006.01)

Patent

CA 2477513

A proportional solenoid-driven valve control assembly contains a moveable, magnetic armature (222) adjacent to a fixed pole piece (306), providing fluid leakage containment, and having no non-magnetic element for alignment, support or magnetic flux path control. A valve unit (200) coupled with the armature contains a fluid cavity in fluid communication with a fluid inlet port (204) and a fluid exit port (206). The valve is closed by a poppet (220) coupled with the armature (222). To compensate for fluid pressures exerted against the poppet, a flow restriction is provided between an armature cavity (256) and the fluid cavity. Also, a bore (223) is formed through the armature to provide fluid communication between the fluid exit port and the armature cavity. This serves to balance fluid pressures at the fluid inlet and exit ports applied to the opposite sides of the fluid flow restriction.

L'invention concerne un ensemble de commande de soupape proportionnelle entraînée par un solénoïde, comprenant un induit magnétique (222) mobile, adjacent à une pièce polaire fixe (306), empêchant une fuite de fluide et dépourvu d'éléments non magnétiques pour assurer un alignement, un support ou pour commander le trajet du flux magnétique. Une unité soupape (200) couplée à l'induit présente une cavité de fluide communiquant avec un orifice d'entrée de fluide (204) et un orifice de sortie de fluide (206). La soupape est fermée par un clapet (220) couplé à l'induit (222). Un étranglement, situé entre une cavité d'induit (256) et la cavité de fluide, sert à compenser les pressions exercées par le fluide sur le clapet. Un orifice (223) est ménagé à travers l'induit pour assurer une communication entre l'orifice de sortie de fluide et la cavité d'induit. Cet orifice sert à équilibrer les pressions de fluide au niveau des orifices d'entrée et de sortie de fluide, appliquées sur les côtés opposés de l'étranglement.

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