On 4/19/2018 1:36 PM, Leon Fisk wrote:
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!


Oh, no. I wouldn't do that. Just a temporary one to see what is
happening. I used a flexible hard (somewhat) plastic airline in a loop
for my link so I can remove it without kinking it like if I used copper.
I did the same thing on my portable roll around compressor years ago
when I replaced its pump. Its held up fine, but the shutoff pressure is
about 20 PSI lower.