Fluid pressure reduction device with linear flow characteristic

• US 6,026,859 A
• Filed: 01/25/1999
• Issued: 02/22/2000
• Est. Priority Date: 01/28/1998
• Status: Expired due to Term

• Current Assignee: Fisher Controls International LLC (Emerson Electric Company)
• Original Assignee: Fisher Controls International LLC (Emerson Electric Company)
• Inventors: McCarty, Michael W., Wears, William Everett
• Primary Examiner(s): FOX, JOHN C
• Application Number:
  US09/236,826
• Time in Patent Office: 393 Days
• Field of Search: 137/625.3, 137/625.33, 251/127, 138/42
• US Class Current: 137/625.33
• CPC Class Codes: F15B 2013/008 Throttling member profiles
• CPC Class Codes: F16K 47/08 for decreasing pressure or noise level and having a throttling member separate from the closure member , e.g. screens, slots, labyrinths
• CPC Class Codes: Y10T 137/86759 Reciprocating

Abstract

A fluid pressure reduction device with stacked disks. Flow disks with inlet stage slots and outlet stage slots alternate with plenum disks having plenums and bypass slots. The bypass slots are aligned with the inlet stage slots so the flow capacity increases continually in a substantially linear manner when used in a flow control valve and the valve flow control element uncovers more of the stacked disk flow inlet openings.

Claims

1. A fluid pressure reduction device comprising:

a plurality of stacked disks having a perimeter and hollow centers aligned along a longitudinal axis;

said stacked disks including alternating first and second disks;

said first disk having (a) fluid inlet stage slots partially extending from the disk center towards the disk perimeter, and (b) fluid outlet stage slots partially extending from the disk perimeter towards the disk center;

said second disk having (c) at least one plenum slot extending through the disk, and (d) bypass slots partially extending from the disk center towards the disk perimeter and aligned with the fluid inlet stage slots in an adjacent first disk; and

said disks selectively positioned in said stack to enable fluid flow from the disk center to said fluid inlet stage slots in one disk and from said bypass slots in an adjacent second disk to said fluid inlet stage slots in said one disk, then to said plenum slots in adjacent disks and to said fluid outlet stage slots in at least said one disk, wherein the fluid flow path is split into two initial axial directions, then into said plenum slots with multiple radial flow directions, and then distributed through multiple outlet stage slots in at least said one disk.

2. A fluid pressure reduction device according to claim 1, wherein said bypass slots are aligned with inlet stage slots of respective adjacent first disks on opposite sides of the second disk.

3. A fluid pressure reduction device according to claim 1, wherein said bypass slots are each formed as half moon shaped profiles.

4. A fluid pressure reduction device comprising:

a plurality of stacked disks having a perimeter and hollow centers aligned along a longitudinal axis;

said stacked disks including alternating flow disks and plenum disks;

said flow disk having (a) fluid inlet stage slots partially extending from the flow disk center towards the flow disk perimeter, and (b) fluid outlet stage slots partially extending from the flow disk perimeter towards the flow disk center;

said plenum disk having (c) at least one plenum slot extending through the plenum disk, and (d) bypass slots partially extending from the plenum disk center towards the plenum disk perimeter and aligned with the fluid inlet stage slots in respective adjacent flow disks on opposite sides of said plenum disk; and

said disks selectively positioned in said stack to enable fluid flow from the disk center to said fluid inlet stage slots in one flow disk and from said bypass slots in an adjacent plenum disk to said fluid inlet stage slots in said one flow disk and in said respective adjacent flow disk on the opposite side of said plenum disk, then to said plenum slots in adjacent disks and to said fluid outlet stage slots in at least said one disk, wherein the fluid flow path is split into two initial axial directions, then into said plenum slots with multiple radial flow directions, and then distributed through multiple outlet stage slots in at least said one disk.

5. A fluid pressure reduction device according to claim 4, wherein said bypass slots are each formed as half moon shaped profiles.