Need low pressure high flow coltron

[flycast]

I need good control over air pressure with high flow. I have a 1" pipe with 120 PSI incoming. I need to control the pressure to 0-5 PSI with "good" flow. I bought a regulator (0-12 PSI) from McMaster.com and that seems to be good. I bought a gauge (0-5PSI) and that is good. My issue is that I need to protect the gauge from over pressure.

I bought an adjustable pressure relief valve that has a simple adjustable spring. The issue is that if it starts popping open at 1 PSI it does not open fully. If the operator turns the pressure up then the pressure starts rising in the system possibly ruining the gauge.

I looked for pilot operated relief valves but all I seemed to find were too high a pressure and too big a pipe size.

Does anybody have any suggestions for saving that gauge?

 

[Compositepro]

A "quick exhaust valve" is essentially an inexpensive pilot operated relief valve. However, it seems that your protection will cost more than what you are trying to protect.

 

[mcgyvr]

how high is "high flow"..
There are plenty of 0-5 PSI regulators out there..

 

[John2025]

small orifice between the relief valve and the gauge, aka "snubber"?