Check valve having variable opening-force threshold

Details Check valve having variable opening-force threshold Check valve having variable opening-force threshold

Category

F - Mech Eng,Light,Heat,Weapons

Subcategory

16

Subsubcategory

K

IPC codes

F16K 15/03 (2006.01) F16K 1/20 (2006.01) F16K 31/52 (2006.01)

Type

Patent

Patent number

CA 2451388

Description

A check valve (10) is provided to maintain fluid flow in a single desired direction through a conduit. The check valve (10) requires a greater fluid pressure to open the check valve to allow fluid to pass in a desired direction than an amount of pressure required to keep the check valve in its open position. This variable opening force performance is provided by providing a closure arm (340) exerting a closure force on a flapper (120) urging the flapper toward its closed position. Contact between the closure arm (340) and the flapper (120) occurs between a follower (360) on the closure arm (340) and a cam surface (126) on the flapper (120). A contour of the cam surface on the flapper, and especially a hump (124) on the cam surface causes the closure arm (340) to exert a variable amount of force on the flapper (120) depending on the position of the flapper. When the flapper (120) is closed a relatively large amount of force is exerted on teh flapper. When the flapper (120) is open a relatively smaller amount of force is exerted on the flapper by the closure arm (340). The dimensions and contours of the follower (360) and the cam surface (126) can be customized to provide desired closure arm force exerting characteristics for the check valve (10) of this invention.

L'invention concerne un clapet (10) destiné à maintenir un débit fluidique dans une seule direction désirée à travers un conduit. Ce clapet (10) nécessite une pression fluidique d'ouverture du clapet permettant au fluide de passer dans une direction désirée supérieure à une pression nécessaire pour maintenir le clapet dans sa position ouverte. La force d'ouverture variable est générée par un bras (340) de fermeture exerçant une force de fermeture sur un battant (120), poussant le battant vers sa position fermée. Le contact entre le bras (340) de fermeture et le battant (120) se produit entre un prolongateur (360) sur le bras (340) de fermeture et une surface (126) de came sur le battant (120). Un contour de la surface de came sur le battant, et en particulier une bosse (124) sur la surface de came, pousse le bras (340) de fermeture à exercer une force variable sur le battant (120) en fonction de la position du battant. Lorsque le battant (120) est fermé, une force relativement grande est exercée sur le battant. Lorsque le battant (120) est ouvert, une force relativement plus faible est exercée sur le battant par le bras (340) de fermeture. Les dimensions et contours du prolongateur (360) et de la surface (126) de came peuvent être personnalisés de manière à obtenir des caractéristiques recherchées d'application de force du bras de fermeture pour le clapet (10) de l'invention.

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