Hi folks, new to forum and need some help/advice. Just installed new pressure regulator at son's house. Installed ball cut off before and after regulator. Replaced his old regulator because pressure was jumping to 160 and popping P&T on hot water heater. Everything checked out find before I left his house (pressure at 50psi, no noise). Got a call from Son and he says every time water is turned on (anywhere in house), pressure regulator has a srill whistle noise (heard it over phone, rather ear peersing!). Any one got any ideas/suggestions?