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  • making a miniature scuba-second-stage-like regulator

    Discussion in 'The main mechanical design forum' started by wizardofid, Jul 28, 2016.

    1. wizardofid

      wizardofid Active Member

      Sep 2009
      Likes Received:
      I'm working on what (I now think) is schematically similar to a scuba diving second stage regulator. Fundamentally, it uses normal lung inspiration to move a diaphragm, or piston, which in turn moves a lever that opens a valve to a tiny tank under high pressure (about 3-4 bar). i.e. the diaphragm and lever are the mechanical advantage for normal lung inspiration (about 1.4 CIW) to open the valve. I have no ambient pressure and temperature issues (not underwater), but size is a concern. Tending to tiny is good. A real scuba regulator size is gargantuan.

      Would anyone know where I can access a cut section, or reasonably accurate, 3D CAD files of an adjustable or non-adjustable scuba second stage regulator for reference? Or any design-engineering tips is much appreciated.
    3. Dana

      Dana Well-Known Member

      Sep 2010
      Likes Received:
      How is this different from any other pressure regulator? The only thing I see is that since the regulated pressure is so low, the diaphragm must be relatively large to provide enough working force to operate the valve.

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