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Cold water pressure relief valve leaking, not the TRP valve

Asked Jun 27, 2010, 08:58 AM — 5 Answers
Hello.
Cold water pressure relief valve start to drip water through the drain pipe. I replaced it with a new one but it is also dripping water. I have reduced water pressure in the house to the minimum by turning main water supply valve but it still leaking.
Thanks for your help.

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5 Answers
Milo Dolezal's Avatar
Milo Dolezal Posts: 5,913, Reputation: 1933
Plumbing Expert
  
#2

Jun 27, 2010, 10:02 AM


Closing main water supply valve half way doesn't reduce pressure.

There are 3 main reasons Pressure Relieve Valve leaks:

1. Faulty PRV ( replace PRV )
2. Pressure to high ( reduce pressure at the regulator or replace it with new one AND replace PRV )
3. Thermal Expansion ( Install Thermal Expansion Tank + replace PRV )
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mod3rnj's Avatar
mod3rnj Posts: 5, Reputation: 10
New Member
  
#3

Jun 27, 2010, 12:50 PM
Thank you very much for your quick respond.
I've replaced PRV two times and both dripping water.
I've reduced pressure at the regulator (not by closing half way main water supply valve). I guess I'll try Expansion Tank.
Thanks again.
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KISS's Avatar
KISS Posts: 12,613, Reputation: 4388
Uber Member
  
#4

Jun 27, 2010, 01:21 PM
Invest in a hose bib water pressure gage so you KNOW what's going on instead of guessing: Water Pressure Gauge w/ Garden Hose Adapter - FreshWaterSystems.com

You will then be able to isolate PRV and expansion tank issues.

1. PRV bad when pressure is unregulated when any valve is open in the house even a small amount.

2. Expansion tank test:
1. Turn off water heater until cool (overnight)
2. Don't use any water. Monitor pressure.
3.Turn on water heater.
If pressure increases significantly as the water heats up the expansion tank is faulty.


It's unclear if you have an expansion tank. Set pressure to about 50 PSI.
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speedball1's Avatar
speedball1 Posts: 27,853, Reputation: 9560
Senior Plumbing Expert
  
#5

Jun 27, 2010, 05:59 PM


Is there a sprinkler system or a backflow preventer, (see image) installed? What's the house water pressure after you reduced it? Let me know. Tom
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mod3rnj's Avatar
mod3rnj Posts: 5, Reputation: 10
New Member
  
#6

Jun 28, 2010, 06:18 PM
Quote:
Originally Posted by speedball1 View Post
Is there a sprinkler system or a backflow preventer, (see image) installed? What's the house water pressure after you reduced it? Let me know. Tom
Hi, Tom
Thank you for your respond. I've purchased today water pressure gage and it show 61 psi. (I actually increase it back since with the lower settings PRV was dripping water any way.) PRV stamped 75 psi. We do not have sprinkler system and back flow preventer in the house.
Mike
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