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Yes, I agree with your analysis. There was some question as the if the PRV was adjustable, but clearly it's not. Why it let go at about 10 lbs is a mystery, but maybe just failure due to age. Thanks!

Yes, I turned down the screwe and it started to fill. It looks exactly like the one you posted. I will change out the PRV valve as it starts to release at close to 10lbs. I hope that will allow the pressure to get up and stay up. Would you recommend replacing the autofill or not necessary? Thanks!

Hello: New to forum. I have an older Weil-McClain hot water boiler, single zone, with old style radiators. I noticed some of the radiators were not getting warm so checked water pressure guage. Only about 5lbs of pressure. I added water (Bell and Gossett water reducing valve) and the PRV popped...