If you drain your system you can then put a pressure gauge on your pressure vessel and see if it correct - I believe they are normally around 12psi but I don't think it is critical. If you get water coming out of the valve your diaphragm has failed. Once that is correct you can refill the system, bleed it and then look for leaks. Don't forget to check the PRV in case that is dripping.
Richard
December 2008
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