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If we're talking about elegance here, I'd almost rather see
something in "Y" form where the valve is a butterfly between two
inlets and combines the flows into a single outlet. Then only one
valve is needed. If only one pump is pushing, the butterfly valve
would block reverse flow into the other pump. If both pumps are
pushing the butterfly valve would open relatively evenly
(assuming equal flow from both pumps) and allow both to flow.
Last week before I flew with the existing single pump arrangement, I built
exactly what you're talking about here. It is a "T" that combines the flows
with a flapper valve. It took about 2 hours to weld it up from alum and hand
shape it. (last weeks talk of mills and lathes really had me wishing:-).
I've not tested it yet but I had it on hand to install with the replacement
pump if it proved necessary. It weighs 3/4lb. Fortunately it has not been
required so I've opted to keep it simple for now, however extended flight
over water or other inhospitable terrain may make this a desirable feature.
I've just got to be certain that it will not add another failure mode to the
system. I took some pics of it but they are of the olde fashioned film
variety and I've not yet developed them.
S. Todd Bartrim
Turbo 13B RV-9Endurance
C-FSTB
http://www3.telus.net/haywire/RV-9/C-FSTB.htm
"Whatever you vividly imagine, Ardently desire, Sincerely believe in,
Enthusiastically act upon, Must inevitably come to pass".
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