Anti-cavitation low-noise control valve cage trim for high...

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

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F15D 1/00 (2006.01) F16K 47/08 (2006.01)

Patent

CA 1237634

ABSTRACT OF THE DISCLOSURE A valve trim cage assembly for anti-cavitation control valves comprises a plurality of concentrically nested, cylindrical sleeves with fluid flow constricting annular channels defined between adjacent sleeves. Each sleeve has an identical multiplicity of radial plenum holes contained therein which serve as expansion chambers, each plenum hole intersecting at least one flow constricting channel to provide tortuous fluid flow paths of alternating expansion plenum holes and constricted annular channels radially through the cage assembly. The cross sectional area of the channels increase from sleeve to sleeve in the direction of fluid flow to provide staged and gradually decreasing pressure reduction as the flow proceeds through the cage assembly. The area of the plenum holes is much greater than the total cross sectional area of all annular channels intersecting the plenum hole such that the channels are always flow restricting and the plenums are expansion chambers.

473836

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