Noisy squealing cold water

[Helptav]

Hi. I need some help please. Our cold taps and toilets make a squealing noise. I've tweaked the stopcock (always had high pressure) and service ball type vale above and it's helped. It's only there a bit now and still when water shuts off from fluid master toilets (sqeeeeak as they shut off) do I need a new stopcock? Doesn't seem to shut off water that well anyway. Running out of ideas. Thanks (even thought about prv)

 

[townfanjon]

Depending on your water pressure, a prv may help no end . Have you any idea of the pressure ?

 

[Helptav]

Hi i don't know the pressure. But it's rather powerful

 

[Scott_D]

As above you can buy a gauge to test
If it’s higher fit a pressure reducing valve

 

[Helptav]

I've contacted the water company they haven't changed anything and haven't needed a gauge for 9 years.....

 

[DiggerDave]

PRV is the way to go

 

[Riley]

Doesn’t mean there’s not a problem now. Water pressure could be doing for your fittings if it’s crazy high

 

[Helptav]

I have a little service valve above the stopcock so I'm guessing this will be the ideal place ? how much will it cost to have one fitted ?