Quote:
Originally Posted by FrankJ
I always set the cracking pressure, the pressure that the relief first opens to 125 PSI. The full flow pressure is somewhat higher. The re-seat pressure is usually somewhat lower. If the pressure is different at inspection, we adjust to accommodate the inspector. It is not a precision device. You do not want the cracking pressure anywhere near the working pressure.
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That's the way I've always done it. The goal is to keep pressures safe and for the relief valve never to release air unless there is a problem with system, i.e. the stored air reaches above 125psi.