Stacked disk valve trim

摘要

Pressure reduction in a fluid flow control device is optimized, minimizes valve wear and presents solutions in reducing, attenuating, eliminating, damping, redirecting, or otherwise defeating valve noise. In one embodiment, a flow control device is provided including a valve trim assembly comprising a plurality of stacked valve trim disks 22A-22D defining a plurality of flow paths 30 along a fluid passage between a fluid inlet and a fluid outlet of the flow control device. Respective flow paths defined by the valve trim disks comprise an expansion/contraction mechanism 40, a velocity control mechanism 50, an acoustic chamber 60, and frequency shifting passages 70. The expansion/contraction mechanism 40 has a cross section including rapid increases and decreases in cross-sectional flow area. The velocity control mechanism 50 defines a cross-sectional flow profile defining a relatively low cross-sectional flow area proximate the fluid inlet and a relatively high cross-sectional flow area proximate the fluid outlet. The acoustic chamber 60 is configured to defeat acoustic disturbances generated in the expansion/contraction mechanism 40 and the velocity control mechanism 50. The frequency shifting passages 70 are configured to direct fluid flow from the acoustic chamber 60 to the fluid outlet and increase the sonic frequency of acoustic disturbances associated with the directed fluid. Also disclosed is the expansion/contraction mechanism in the form of V-shaped turns defined within a single trim disk and lying in a plane defined by the disk.