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Quieting means for a fluid flow control device is shown in connection with a typical spool type throttling valve. The quieting means consists of a stack of washer-like members or disks which cooperate to define a large number of finely divided flow paths across the stack of disks. To provide a confi

Quieting means for a fluid flow control device is shown in connection with a typical spool type throttling valve. The quieting means consists of a stack of washer-like members or disks which cooperate to define a large number of finely divided flow paths across the stack of disks. To provide a configuration which is very economical of space, the disks are arranged such that the flow path turns back and forth through different planes. Groups of flow paths are defined by a number of groups of three perforated disks confined between two imperforate disks. Two perforated disks having patterns of slots are positioned on opposite sides of a similar disk having a pattern of small orifices. By proper juxtaposition of the three disks, a circuitous flow pattern is established from a first chamber defined by a first slot and its side walls, axially through a small orifice to a second such chamber, substantially radially through said second chamber and axially in the opposite direction to another such chamber and continuing in this manner across the stack of disks. The dimensions of the slots and orifices are chosen such that the velocity of flow through any orifice does not exceed a desired limit.

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A flow control device for installation in a fluid transfer system including a spool valve member controlling a flow of fluid under high pressure such that a potentially destructive or noise-generating fluid pressure differential exists; a rigid structure surrounding said spool valve member comprisin

A flow control device for installation in a fluid transfer system including a spool valve member controlling a flow of fluid under high pressure such that a potentially destructive or noise-generating fluid pressure differential exists; a rigid structure surrounding said spool valve member comprising a series of stacked annular disks having abutting faces, some of said disks including a pattern of elongated slots therethrough defining areas of individual chambers and some of said disks having orifices therethrough of substantially smaller area than said slots, said slots and orifices alternating in patterns across said disks to produce a plurality of individual passageways across said structure, some of said disks having imperforate areas adjacent said slots to confine flow in defined streams in each of said passageways such that each such stream always changes direction to flow across the same orifice disk, movement of said spool valve serving to expose varying numbers of said disks to said flow of fluid.