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Fixed and variable resistance fluid throttling apparatus

  • US 4,125,129 A
  • Filed: 07/26/1976
  • Issued: 11/14/1978
  • Est. Priority Date: 04/04/1975
  • Status: Expired due to Term
First Claim
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1. In a fluid throttling apparatusa number of horizonal, flat, annular stamped metal discs,said discs fixedly concentrically face-engaged in a vertical stack having inner and outer peripheries, one of which peripheries comprises a cylindrical wall,a cylindrical member having a cylindrical wall for mating engagement with said cylindrical stack wall,at least some ones of said discs provided with horizontal flow area openings,at least some others of said discs constructed and arranged in said stack to provide vertical flow restriction orifices,all said flow area openings of said discs being open to said cylindrical stack wall and closed to the other stack periphery,said flow area openings of said ones of said discs having radial and circumferential extent to encompass the area of said flow restriction orifices provided by said others of said discs,said ones and others of said discs so sequenced and so relatively rotated in said stack as to define therewithin and around its said wall generally vertical fluid throttling channels comprised each of alternating series of vertically juxtaposed flow area openings and flow restriction orifices,said discs further constructed and arranged to reversingly horizontally offset the vertically successive orifices of said channels whereby said channels define toruous passageways in which the fluid is made to travel horizontally in said openings and to turn right angularly into and out of said orifices,means for relatively vertically shifting said stack and cylindrical member between full closed and full open positions of greater and lesser overlapping of said stack wall by said mating cylindrical member wall,means for closing off vertical flow through the end of said stack that is overlapped by said cylindrical member only in the full closed position of said stack and cylindrical member,whereby in the between full closed and full open positions of said stack and cylindrical member the flow into and out of said tortuous passageways is only radial at said one, vertical-flow-closed end of, and only vertical at the other, cylindrical-member-overlapped end of, said stack, andmeans for varying at least one of the (a) active number and (b) effective area of said channels as said stack and cylindrical member are shifted between their said closed and open positions,said varying by said means such that said shifting varies the flow area and inversely varies the flow resistance of said stack.

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