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Posted by Charlie on June 17, 2006, 7:45 pm
So for starters, throw the breaker on the hot water heater (electric,
obviously) and then run out some hot water and check the pressure again.
The take the PRV apart........
Charlie
> Charlie wrote:
> > My house water pressure regulator has started to make a high pitched
'whine'
> > whenever the water is on somewhere in the house.
> >
> > I put a pressure gauge on the outside hose bib, without any water
running in
> > the house, and the pressure gauge showed 118 psi.
> >
> > I opened a bath tub's hot and cold faucets, and the pressure dropped on
the
> > gauge to 48 psi;
> >
> > I then also opened the second tub's hot and cold faucets, and the
pressure
> > gauge dropped to 28 psi.
> >
> > I'm confused as how the pressure regulator is suppose to work; and isn't
an
> > initial 118 psi a tad bit high?
> >
> > Anybody out there know anything about these things and give me a bit of
> > direction?
> >
> > Thanks in Advance,
> > Charlie
> >
> >
> >
> You're on the right track. Ideally, the PRV should maintain a
> fairly steady pressure in the range of 40-60psi.
>
> Your initial reading of 118 psi says that either the PRV is
> leaking internally (not seating perfectly) OR there is
> thermal expansion from the water heater causing pressure buildup.
> You could rule this out by doing the test when the heater is not firing
> and bleeding some water off first.
>
> The drop in pressure as fixtures are opened may or may not be normal
> and will be difficult to evaluate since it depends upon so many
> factors unique to your house piping and supply pressures.
>
> You can get rebuild kits for most of these valves or just take apart
> and clean the seating surfaces.
>
> Jim
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