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Method-and-device-for-providing-fluid-resistance-within-a-flow-passageway

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Method and device for providing fluid resistance within a flow passageway

Details

Inventors: Lee, II, Leighton;
Assignee: The Lee Company (Westbrook, CT)
Primary Examiner: Scherbel; David
Assistant Examiner: Brinson; Patrick F.
Attorney, Agent or Firm: Lee; Philip J.

A method for providing resistance to flow through a flow passageway comprises partially blocking flow through an orifice of reduced diameter by masking the orifice with an element formed of porous material retained immediately adjacent to every side of the orifice that is expected to be exposed to higher pressure fluid with a greater surface area of the porous masking element being exposed to fluid in the passageway on the higher pressure side of the orifice than is exposed by the orifice to the lower pressure fluid. The orifice may be formed by direct configuration of the passageway walls or by a body adapted to retain the masking element in the body, the outside of the body being adapted to for secure installation within the flow passageway. Resistors in accordance with the present method may have masking elements on one side for use with one directional pressure differentials or masking elements on both sides for use in applications in which bidirectional pressure differentials are anticipated.

DETAILED DESCRIPTION The method of the present invention and devices formed in accordance therewith provide a means for obtaining high fluid resistance at a relatively low cost, with a low rate of clogging and the ability to withstand high pressure differentials across the resistor.
The method comprises forming an orifice of reduced internal diameter that is as small as is possible to achieve at a commercially reasonable cost and then partially blocking the orifice by covering it with a masking element formed of a suitably porous material.
The surface of the masking element is partly solid and partly open and covers the high pressure side of the orifice, reducing the effective size of the orifice to a percentage of its original area corresponding to the percent of open area on the surface of the porous material abutting the orifice.
The masking element is retained on the side of the orifice that is expected to be exposed to higher fluid pressure.
In applications where one directional pressure differentials are expected, a single masking element may be used.
In applications where the pressure differential may change directions, and either side may be the high pressure side, two elements, one on either side of the orifice, are used.
One or more orifices are created at the smallest diameter that can be produced at a reasonable cost and the orifices may be arranged in series or in other configurations.
The porous material masking element is secured immediately proximate to and covering the orifice.
The means for securing the masking element in proximity to the orifice preferrably leaves as much as possible of the surface area of the porous material open and exposed to the pressure of the fluid distal from the orifice, without unduly compressing the material of the masking element.
In the preferred method, a radial clearance is created around the body of the masking element except where the masking element is secured by press fitting one end of the masking element into a socket with an internal diameter that is slightly less than the internal diameter of the masking element

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