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 2747914

A valve assembly suitable for regulating the flow of fluid between a working chamber of a fluid-working machine and a fluid manifold. The valve assembly comprises a valve body comprising a valve seat, a fluid passage extending through the valve body, and a travelling member comprising a valve member, which valve member is 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 defining 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 defining a fluid flow path including a constricted flow region and further comprising a reduced pressure chamber in communication with both a first surface of the travelling member and the con-stricted flow region, arranged to exert a force on the travelling member by way of a pressure reduction in the reduced pressure chamber when fluid is flowing along the fluid flow path, through the constricted flow region, which force acts to resist closure of the valve. Thus, a force is generated which opposes forces acting on the valve member due to the flow of fluid past the valve member.

L'invention porte sur un ensemble soupape régulant le débit d'un fluide entre la chambre de travail d'une machine entraînée par fluide et une tubulure. L'ensemble valve comprend un corps de soupape, lequel comporte un siège, un passage de fluide 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, et 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 fluide. L'ensemble soupape se caractérise par un canal d'écoulement du fluide comprenant une zone d'étranglement et une chambre sous pression réduite communiquant avec à la fois une première surface de l'élément mobile et la zone d'étranglement, et exerçant une force sur l'élément mobile sous l'effet de la pression réduite de la chambre sous pression réduite lorsque le fluide s'écoule dans le susdit canal en traversant la zone d'étranglement ladite force agissant pour résister à la fermeture de la soupape. On crée ainsi une force qui s'oppose aux forces agissant sur l'élément de soupape sous l'effet de l'écoulement du fluide contournant l'élément de soupape.

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