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High water pressure

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Street pressure is 100 psi. PRV set at 50 PSI. Have replaced PRV three times thinking I just got a defected one. All came from the Hiram HD ,watts 3/4 LFX 65 BU. All would hold pressure at 50psi when water is being used,and hold at 50 when water is not being used, but pressure slowly creeps up to 100psi after a short period of time. There is NO expansion tank in home but this happens when water heater has not ran. Have lived here since house was built 1997 and never had problems before. Any ideas ?

Thanks, abthree

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