US3978891A — Quieting means for a fluid flow control device

Claim 1

Independent Claim 170 words

A fluid flow controlling device comprising: a rigid structure comprising a series of stacked laminar members having abutting faces, alternate ones of said members having respective patterns of passageways therethrough, said passageways being in offset but partially overlapping relation to one another and others of said members including means defining a plurality of orifices of substantially smaller effective area than the area of said passageways but aligned with the overlapping parts of pairs of said passageways such that a plurality of generally radial flow patterns are created across said structure with individual passages being defined by a plurality of adjacent said stacked laminar members providing two overlapping passageways and an orifice therebetween, said orifice members being positioned between others of said laminar members and some of said laminar members providing walls confining individual flow patterns such that each such pattern always changes direction to flow across the same orifice member, wherein the pressure drop across said structure is substantially that caused by the orificial losses across said orifices in series.

Claim 2

Dependent Claim 170 words

A fluid flow controlling device comprising: a rigid structure comprising a series of stacked laminar members having abutting faces, alternate ones of said members having respective patterns of passageways therethrough, said passageways being in offset but partially overlapping relation to one another and others of said members including means defining a plurality of orifices of substantially smaller effective area than the area of said passageways but aligned with the overlapping parts of pairs of said passageways such that a plurality of generally radial flow patterns are created across said structure with individual passages being defined by a plurality of adjacent said stacked laminar members providing two overlapping passageways and an orifice therebetween, said orifice members being positioned between others of said laminar members and some of said laminar members providing walls confining individual flow patterns such that each such pattern always changes direction to flow across the same orifice member, wherein the pressure drop across said structure is substantially that caused by the orificial losses across said orifices in series.

Claim 3

Dependent Claim 28 words

A fluid flow device as set forth in claim 1 wherein any flow passageways which are not required for throttling control are made large to minimize fluid velocities.

Claim 4

Dependent Claim 23 words

A flow control device as set forth in claim 1 wherein a plurality of orifices in parallel direct fluid into individual said passageways.

Claim 5

Dependent Claim 168 words

In a flow control device for installation in a fluid transfer system including a flow of fluid under high pressure such that a potentially destructive or noise-generating fluid pressure differential exists; a rigid structure comprising a series of stacked laminar members having abutting faces, nonadjacent ones of which have a pattern of elongated passages therethrough defining areas of individual chambers and others of said members being interposed between pairs of said nonadjacent members and having a pattern of orifices providing communication between said passageways, said passageways and orifices alternating in patterns across said members to produce a plurality of individual streams of fluid flowing across said structure, said orifices being of stubstantially smaller cross-sectional area than said passageways such that the pressure drop across said structure is substantially that caused by the orificial losses across the orifices in series, and some of said laminar members providing walls confining groups of said individual streams such that each such stream always changes direction to flow across the same orifice member.

Claim 6

Dependent Claim 168 words

In a flow control device for installation in a fluid transfer system including a flow of fluid under high pressure such that a potentially destructive or noise-generating fluid pressure differential exists; a rigid structure comprising a series of stacked laminar members having abutting faces, nonadjacent ones of which have a pattern of elongated passages therethrough defining areas of individual chambers and others of said members being interposed between pairs of said nonadjacent members and having a pattern of orifices providing communication between said passageways, said passageways and orifices alternating in patterns across said members to produce a plurality of individual streams of fluid flowing across said structure, said orifices being of stubstantially smaller cross-sectional area than said passageways such that the pressure drop across said structure is substantially that caused by the orificial losses across the orifices in series, and some of said laminar members providing walls confining groups of said individual streams such that each such stream always changes direction to flow across the same orifice member.

Claim 7

Dependent Claim 31 words

A flow control device as set forth in claim 4 wherein the fluid velocity on the downstream side of said structure is substantially the same as that on the upstream side.

Claim 8

Dependent Claim 44 words

A flow control device as set forth in claim 4 wherein the number of series orifices and their effective areas are chosen such that the Reynold's number for any one of said orifices does not exceed a value equivalent to the desired noise level.

Claim 9

Dependent Claim 123 words

A fluid flow controlling device comprising: means providing a plurality of passageways through which flow of fluid is subdivided, said means comprising a series of stacked members having abutting faces and arranged in groups, two of said members of each group being disks and a third member being interposed between said disks and comprising a disk having a plurality of concentric annular ridges on one side and a plurality of similar ridges on the opposite side spaced radially from those on said one side and a plurality of orifices extending through the web of said member between said ridges, said orifices thereby directing flow into different planes and providing orificial pressure reductions, each of which is followed by chambers of larger cross-sectional area.

Claim 10

Dependent Claim 123 words

A fluid flow controlling device comprising: means providing a plurality of passageways through which flow of fluid is subdivided, said means comprising a series of stacked members having abutting faces and arranged in groups, two of said members of each group being disks and a third member being interposed between said disks and comprising a disk having a plurality of concentric annular ridges on one side and a plurality of similar ridges on the opposite side spaced radially from those on said one side and a plurality of orifices extending through the web of said member between said ridges, said orifices thereby directing flow into different planes and providing orificial pressure reductions, each of which is followed by chambers of larger cross-sectional area.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1979-09-07	1980-03-08	1980-09-07	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1983-09-07	1984-03-08	1984-09-07	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1987-09-07	1988-03-08	1988-09-07	$7700.00	Window Closed / Lapsed

Quieting means for a fluid flow control device

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