초록 ▼

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 indentical multiplicity of radial plenum holes contained therein which

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 indentical 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.

대표청구항 ▼

In a fluid control valve having an inlet and an outlet, a cavitation and noise resistant valve trim cage assembly comprising a plurality of cylindrical sleeves nested concentrically within one another, each sleeve containing an identical multiplicity of radial plenum holes spaced apart circumferenti

In a fluid control valve having an inlet and an outlet, a cavitation and noise resistant valve trim cage assembly comprising a plurality of cylindrical sleeves nested concentrically within one another, each sleeve containing an identical multiplicity of radial plenum holes spaced apart circumferentially and axially in rows, the plenum holes in each circumferential row being spaced by at least two plenum hole diameters, each of said sleeves, except the innermost or outermost sleeve, containing a multiplicity of elongated narrow annular flow constricting channels in one surface thereof, said channels being so located as to provide at least one annular channel between adjacent plenum holes in each circumferential row, said sleeves being adapted to be concentrically nested in an offset relationship such that the plenum holes in one sleeve will not be in alignment with the plenum holes of an adjacent sleeve provided that any given plenum hole will communicate through said channels with neighboring offset plenum holes contained in the same circumferential row of an adjacent sleeve, the total cross sectional area of the annular channels leading into any given plenum hole being less than the cross sectional area of that plenum hole, thereby providing tortuous elongated flow paths through said sleeve of said valve trim wherein the annular channels serve as flow constricting passageways and the plenum holes serve as expansion chambers.