PRV - personal question 1

[nuche1973]

Greetings all:
I have a question...I am purchasing a house and the incomming water pressure is 51psi. I had a to hire a plumber to pressure check my lines and he suggested that I install a PRV (pressure reducing valve). He claimed that it would increase the water pressue in my lines. This sounded far fetched since what he showed me was just an adjustable valve. I am not a plumber but I beleieve the law of conservation of energy still applies here, right? My question is how can this valve increase the pressure in a line with out a pump? The lines are of equal diameter. As I noted, this a personal question. Thanks.


There are days when I wake up feeling like the dumbest man on the planet, then there are days when I confirm it.

 

[zdas04]

People use language in odd ways. A valve that reduces the pressure will not increase the pressure. What it will do is convert fluctuating pressure to constant pressure. That is often a good thing. For example if you are in a shower and the pressure suddenly drops from 55 psig to 50 psig, the flow rate will drop a corresponding amount, but not equally in the hot water and the cold water (the two systems have different dampening values so they respond differently). If you set a pressure reducing valve below the minimum normal transient (usually just a few psi below average in a municipal system) then you will see more consistent performance in mixing applications.

But the valve cannot create pressure.

David