Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Plumbing

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 11-30-2011, 08:50 PM   #1
ink
DIY Enthusiast
 
ink's Avatar
 
Join Date: Jan 2010
Location: Maryland
Posts: 112
Share |
Default

Relief valve(?) over utility sink leaking


The utility sink has this branch and valve over it.



It's in the rental house. The tenant said it's been dripping and getting gradually faster, and now it's going at the rate of a slow faucet.

Before I just go and cap this thing, I figured I should find out what it's for and if it's needed. At a guess, I'd say it's a pressure relief valve? Working on that hunch, I gradually closed the water main. At no time did the water stop coming out of the valve, though. So if it is a PRV, then either it's not working anymore, or slowly closing the main doesn't effect the pressure enough to change what it's doing.

Any help is appreciated!

Thanks.

__________________
inK

Hammer in Hand, Dad on Speed Dial
http://www.mydadsshoes.com
ink is offline   Reply With Quote
Old 11-30-2011, 08:57 PM   #2
Member
 
Join Date: Nov 2011
Location: Hartfield VA
Posts: 25,761
Default

Relief valve(?) over utility sink leaking


Unless there's a hot water heater under that sink there's no reason I can think of for it being there.
Water lines do not need a pressure relief valve.
Hot water should be on the left not the right so if it's the cold water side then just cap it off.

joecaption is online now   Reply With Quote
Old 11-30-2011, 11:24 PM   #3
Member
 
Join Date: Sep 2008
Location: Oregon
Posts: 1,497
Default

Relief valve(?) over utility sink leaking


It's there for a reason!

Is there a boiler in the house?

Hot water heater and that is the pressure relief for that instead of a T&P valve?

Perhaps the hot water heater needed an expansion tank and that was installed instead? In that case it would leak water when the water heater is heating. Heated water expands and needs to go somewhere!

http://www.lower-my-energybill.com/w...sion-tank.html
Billy_Bob is offline   Reply With Quote
Old 12-01-2011, 07:28 AM   #4
Member
 
Join Date: Nov 2011
Location: Hartfield VA
Posts: 25,761
Default

Relief valve(?) over utility sink leaking


Just look to see where it goes, if it's connected to the cold water side of that sink, and feel if the pipe is hot, if not then it's not a boiler relief or a water heater safety valve.
joecaption is online now   Reply With Quote
Old 12-01-2011, 12:17 PM   #5
ink
DIY Enthusiast
 
ink's Avatar
 
Join Date: Jan 2010
Location: Maryland
Posts: 112
Default

Relief valve(?) over utility sink leaking


Thanks, guys.

It's the cold water side. The water feed splits from a 3/4" and one half feeds the electric HWH while the other feeds the cold side of the sink and the washing machine. The split above the sink is between the HWH and the sink. The HWH is out of frame of the picture directly to the right.

There is no boiler; all electric house (heat pump).

I agree that it was put there for a reason, but I don't know what that reason might be. I recently replaced the HWH, as the old one was on it's last legs. The install was done using the existing plumbing, though, so that shouldn't have changed anything. Any chance this was SUPPOSED to be an expansion for hot water but just was put in the wrong place at construction time?

Thanks!
__________________
inK

Hammer in Hand, Dad on Speed Dial
http://www.mydadsshoes.com
ink is offline   Reply With Quote
Old 12-01-2011, 12:20 PM   #6
Member
 
Join Date: Nov 2011
Location: Hartfield VA
Posts: 25,761
Default

Relief valve(?) over utility sink leaking


The new water heater should have it's own relief valve, so that old one is not needed anymore.
joecaption is online now   Reply With Quote
Old 12-01-2011, 12:21 PM   #7
ink
DIY Enthusiast
 
ink's Avatar
 
Join Date: Jan 2010
Location: Maryland
Posts: 112
Default

Relief valve(?) over utility sink leaking


I need to expand on the first post.. it's a bit deceiving. When I closed the water main, the water coming out of this valve SLOWED, but never stopped (as I would've expected if it was pressure-controlled). If I closed the main entirely, the water would gradually come to a stop, of course.
__________________
inK

Hammer in Hand, Dad on Speed Dial
http://www.mydadsshoes.com
ink is offline   Reply With Quote
Old 12-01-2011, 12:44 PM   #8
Member
 
Ironlight's Avatar
 
Join Date: Apr 2011
Location: Washington DC
Posts: 701
Default

Relief valve(?) over utility sink leaking


If you gradually close the main valve that thing would continue leaking until the main valve was completely shut as your system would continue to have pressure until the main was fully closed.

Shut off the main, open the cold water in the sink to drain that branch, and cap it.
Ironlight is offline   Reply With Quote
Old 12-01-2011, 12:56 PM   #9
Member
 
Join Date: Sep 2008
Location: Oregon
Posts: 1,497
Default

Relief valve(?) over utility sink leaking


Was the water heater running when you closed the main water valve?

When water heats, it expands. That builds up the water pressure if there is a "check valve" at the city water meter or a closed main valve.

Ask your water department if they have check valves at the water meters. If yes, you have a "closed system" and would need an expansion tank for the water heater or that existing pressure relief valve.

If there is no check valve, then as the water heats, excess water would flow backwards through the water meter - relieving the pressure.

Billy_Bob is offline   Reply With Quote
Reply

Tags
pressure valve


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
After Snaking, Basement floor drain and utility sink still Bubbling & Backup bikermark1 Plumbing 2 07-22-2010 12:14 PM
Water Heater Pressure Relief Valve Leaking. merton Plumbing 2 03-29-2010 07:37 PM
temporary set up in utility room for kitchen renovation (sink; dishwasher) ilyaz Plumbing 3 01-25-2010 06:07 PM
Pressure relief leaking and expansion tank full themow HVAC 1 11-25-2009 04:49 PM
Resource for understanding gas valve? darsunt HVAC 19 02-03-2009 11:08 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.