Valve assembly

Details Valve assembly Valve assembly

F - Mech Eng,Light,Heat,Weapons

16

K

F16K 31/08 (2006.01) F16K 47/08 (2006.01)

Patent

CA 2747905

A valve assembly for regulating the flow of fluid between a working chamber of a fluid-working machine and a fluid manifold. The valve assembly comprising a valve body comprising a valve seat, a fluid passage extending through the valve body, and a travelling member comprising a valve member and operable between an open position in which the valve member is spaced apart from the valve seat and fluid can flow through the fluid passage and a closed position in which the valve member is in sealing contact with the valve seat preventing fluid from flowing through the fluid passage. The valve assembly further defines a fluid flow path passing in a first fluid flow mode, between the valve member and the valve seat, and into the fluid passage. The valve assembly is characterised by a barrier upstream of the valve member, to the barrier reduces one or more forces which would otherwise act on the valve member as a result of the flow of fluid to urge the valve member towards the valve seat. Thus, one or more forces which would otherwise act on the valve member to urge the valve member to the closed position due to the flow of fluid past the valve member in the first fluid flow mode are reduced or removed. There is also disclosed a valve assembly in which fluid flowing along the said fluid flow path is incident on the downstream surface of the valve member at an angle of at least 80° to the direction in which the valve member is operable to travel between the open position and the closed position.

L'invention porte sur une soupape réglant le débit d'un fluide entre la chambre de travail d'une machine entraînée par fluide et un collecteur. Le corps de la soupape comporte un siège, un passage fluidique traversant le corps et un élément mobile pouvant passer d'une position d'ouverture où il est distant du siège, ce qui permet au fluide de s'écouler dans le passage à une position de fermeture où il repose sur le siège, ce qui empêche le fluide de s'écouler dans le passage. La soupape comporte en outre un canal où le fluide s'écoule dans un premier mode entre l'élément de soupape et le siège de soupape puis dans le passage du fluidique. La soupape se caractérise par une barrière située en amont de l'élément de soupape et qui réduit la ou les forces qui sinon agiraient sur ledit élément sous l'effet du flux de fluide en poussant ledit élément vers le siège de la soupape. Ainsi, des forces qui agiraient sinon sur l'élément de soupape pour l'amener en position de fermeture sous l'effet du flux de fluide le contournant dans le premier mode d'écoulement sont réduites ou supprimées. L'invention porte également sur une soupape dans laquelle: le fluide s'écoulant le long dudit passage frappe la surface aval de l'élément de soupape en un angle d'au moins 80° dans la direction où ledit élément de soupape de déplace entre la position d'ouverture et la position de fermeture.

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