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I have a couple of RPZ's I am installing new check discs in because the relief opens up, just not when I am testing it's function. I think it's because both the discs aren't seating. The gauge shows the psi differential dropping at a very slow rate. I don't think it's the relief valve, but rather the checks aren't holding.
In the one school there is back pressure because the hot and cold to a mop faucet is crossed, and it has a recirc pump. This RPZ went into full dump earlier in the school year. I put a lazy hand pressure gauge on, and it was at 120 psi, the pressure when I tested was 50. I think the combination of back pressure and high pressure spikes have caused deep grooves in the check discs, I am replacing them tomorrow. However, I shut off the outlet valve when testing, and it holds. I will let you all know what happens.