I didn’t get back to play around with the check valve anymore today.
Tomorrow I’ll play around with it. I was thinking about putting a
very light spring above the check valve disc so it couldn’t close
all the way and shut off gas flow. If the tank is only operating under 2-3 psi
to push the gas out of the tank, my spring would need to be pretty weak
I’m guessing. I’m sure some engineer used "math" to figure it all out.
I’ll have to "guess"!
I may have a pickup tube from a rust single line tank, but they look completely
different in the diagrams.