MULTIPLE STAGE RESTRICTOR

• US 3,856,049 A
• Filed: 02/16/1973
• Issued: 12/24/1974
• Est. Priority Date: 09/23/1971
• Status: Expired due to Term

• Current Assignee: Watts Investment Company
• Original Assignee: William L. Scull
• Inventors: Scull, William L.
• Primary Examiner(s): Ruehl, Charles A.
• Application Number:
  US05/332,918
• Time in Patent Office: 676 Days
• Field of Search: 138/42,43,41
• US Class Current: 138/42
• 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: F16L 55/02781 The regulating element being provided with radial outputs

Abstract

A multiple stage restrictor is characterized by a plurality of stacked plates, the proximate surface of at least one of each pair of adjacent plates in the stack being provided with an arrangement of recesses such as to provide a plurality of alternate zones of relatively increased and relatively decreased velocity defining flow-restricting passages through which the fluid flows.

Claims

1. A multiple stage fluid restrictor adapted to be positioned in the path of flow of a fluid through a confining passage which includes an inlet and an outlet port and comprising a stack of superimposed flow-restriction plates, one plate of said stack of superimposed plates being provided with at least one plurality of spaced recesses in one surface thereof of which one of said recesses communicates with one edge of said plate and another of said recesses communicates with the other edge of said plate, and another one of said plates of said stack of superimposed plates being provided with at least one recess positioned between its edges in the surface thereof adjacent the recess-provided surface of the first-mentioned plate, each recess in the other plate extending a sufficient distance across said other plate to partially overlap and thus communicate with successive ones of said plurality of spaced recesses in the first-mentioned plate when the plates are positioned with these two surfaces in contact with one another, the resulting ovErlapping of the recesses of an adjacent pair of plates thus providing a communicating series of restriction orifices of relatively small cross-sectional area connecting the offset recesses of relatively large crosssectional area extending between the two edges of said adjacent pair of plates so as to define a path of flow for fluid characterized by repeatedly alternate zones of relatively increased and relatively decreased flow velocity respectively, and baffle means connected to both ends of the stack of plates adapted to close said confining passage except for flow of fluid through the stack of plates from one edge thereof to the other.

2. A multiple stage fluid restrictor according to claim 1 in which each of said plates is provided with the first-mentioned plurality of recesses in one surface of the plate and is provided on the opposite surface thereof with each secondmentioned overlapping recess arcuately offset from the firstmentioned plurality of recesses, alternate plates being so positioned in axial alignment that successive recesses in one surface of one plate are overlapped by each recess in the proximate surface of the adjacent plate.

3. A multiple stage fluid restrictor according to claim 1 in which the entire outlet port is filled with an assembly of said superimposed flow-restriction plates.

4. A multiple stage fluid restrictor according to claim 1 in which the outlet port is annular in shape and the plates are of substantially the same annular shape.

5. A multiple stage fluid restrictor according to claim 1 in which said one plate of said stack of superimposed plates includes two spaced recesses communicating with the edges of said one plate.