Gas Block

DanFountain

Here's a variation on Dave Sutton's gas addition / isolation block for my BP-240 conversion. Since the diluent tank valve is very awkward to reach (ala BMR-500) I wanted all control to be accessible on the over-the-shoulder pendant.

Diluent is supplied to the selector valve (Whitey SS-42XF2) by permanent hose from the onboard diluent supply and from the offboard supply via a CEJN fitting (for the sharp-eyed, you're right - that isn't the proper 1/8"-27 NPT thread on the CEJN male - its actually a BC inflator nipple with 3/8"-24 thread, used for demonstation purposes only). (As an aside, these threads are dangerously similar. A 3/8"-24 will thread into 1/8"-27 NPT for about 3 or 4 threads without binding, and, with enough teflon tape, could be made to seal, but certainly not well enough for life support equipment...) Selected diluent (onboard in this pic) is fed to a manifold on the upper left corner of the rig which supples the ADV, bailout reg, wing and/or drysuit. The manual add valve (the ubiquitous Clippard MJV-2 with stronger spring) feeds selected diluent to the counterlung. Wet plugging of the offboard supply can be accomplished with minimal water inclusion by briefly switching the selector from onboard to offboard, blowing the water out of the CEJN male before connecting the offboard whip.

Comments?

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Tautaz

Good idea and job.

Where is it possible to find a stronger spring for MJV2 Clippard button?

DanFountain

There was a thread about that exact subject a few months back: http://www.rebreatherworld.com/home-...e-springs.html.

Hope this helps.

-Dan

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