Sound of travelling water

[SML]

Definite improvement, but still hearing some noise.

 

[SML]

Definite improvement, but still hearing some noise.

After turning stop tap fully open, and thinking the sound was perhaps less as a result, I would say it's actually as it was...So, could it be that, as suggested earlier, it is a result of the PRV working, or any other thoughts?

As before, any help is appreciated, thanks.