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-   -   do Pressure Reducing Valve fail? (http://www.diychatroom.com/f7/do-pressure-reducing-valve-fail-16831/)

wazeaz 02-09-2008 08:15 PM

do Pressure Reducing Valve fail?
 
do Pressure Reducing Valve fail?
I just moved into a 20 year old house. I put a gauge on the water line and I had 80 psi. There is a pressure reducing valve in the crawel space. The screw was all the way in. I adjusted it to get 45 psi and everything was fine. Now (two weeks later) I notice the gauge is at about 42 with water runing. with the water off it goes to 45 psi and then it slowly clims to 55 psi.

Seams to me that the reducing valve is messing up. What do you think.

Ron The Plumber 02-09-2008 08:18 PM

They fail, but that is how they work, your is working fine.

wazeaz 02-09-2008 08:36 PM

Quote:

Originally Posted by Ron The Plumber (Post 96411)
They fail, but that is how they work, your is working fine.

but why is it 45psi most of the time and then sometimes it slowly goes up to 55.

Marlin 02-09-2008 09:30 PM

Do you have an expansion tank on the water heater?

Ron The Plumber 02-09-2008 10:16 PM

Correct, when you have a PRV valve on the line it creates a closed system, when water heats in the water heater it expands, since there is no place for the water to expand to cause of the PRV, it will cause an increase in the water pressure of the house.

wazeaz 02-10-2008 06:57 AM

Quote:

Originally Posted by Ron The Plumber (Post 96462)
Correct, when you have a PRV valve on the line it creates a closed system, when water heats in the water heater it expands, since there is no place for the water to expand to cause of the PRV, it will cause an increase in the water pressure of the house.


that must be it! The water heater is near where I have the pressure gauge. The water heater was on when I was watching the gauge.
Thanks


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