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Inspiration oxygen saver

  • US 4,938,212 A
  • Filed: 10/16/1987
  • Issued: 07/03/1990
  • Est. Priority Date: 10/16/1987
  • Status: Expired due to Term
First Claim
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1. A fluid flow restricting device, comprising:

  • a flow selector element presenting a pair of opposed faces and two sets of spaced apart orifices therethrough, the orifices of each set being of different effective dimensions respectively; and

    a body disposed about said element and having a wall surface adjacent each of said element faces, said body having first and second separate fluid inlet passageways therethrough and passing through one of said body wall surfaces, said body also having corresponding first and second, separate, fluid outlet passageways therethrough and passing through the other of said body wall surfaces,said first inlet passageway and said corresponding first outlet passageway, and said second inlet passageway and said corresponding second outlet passageway, being arranged for fluid flow communication therebetween,the individual orifices of each set thereof being oriented in mated pairs for presenting a plurality of orifice pairs each including one orifice from each set thereof,means mounting said element within said body for selective, sequential, noncontinuous relative shifting movement between the element and body, and for selective stopping of said shifting movement at individual relative operating positions between the element and body,each of said orifice pairs being located and arranged for correlation with a respective one of said operating positions so that, for each of said operating positions, the orifice pair in correlation therewith establishes simultaneous fluid flow communication between said corresponding inlet and outlet passageways.

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