On Thu, 19 Apr 2018 13:24:39 -0700
Bob La Londe wrote:

snip
I had not considered that an air compressor does
not provide constant pressure above the check valve. I guess when I
need to repair/replace that check valve (soon probably) an experiment
might be in order. Should be pretty easy to add an upstream gage to see
what is happening. Might have to use a digital gage with a data output
of some kind so swings can be logged faster.

It was a loooong time ago... I think I tried putting the pressure gauge
ahead of the check valve too. Rather than on the tank. Needless to say
the needle did a lot of pulsing back and forth. Ooops!

--
Leon Fisk
Grand Rapids MI/Zone 5b