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Old 01-09-2017, 11:19 AM   #1
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Thermal Expansion Valve leaking again


Hi,

In 2015 I had my Thermal Expansion Valve replaced as it was leaking cold water into the drain in my basement floor.

It used to have a 60psi rating, so they installed a 90psi rated one due to the high incoming pressure from the main larger valve (maybe the Pressure Reducing Valve?)

Is there a reason this Thermal Expansion Valve would fail just shy of 2 years?

I've heard from some neighbors that they just removed it completely instead of replacing. Good idea or no?


Thanks!

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Old 01-09-2017, 02:49 PM   #2
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Re: Thermal Expansion Valve leaking again


You are located in Canada. Terminology may be a little different. So you are talking about an hvac system or a closed loop system like a water heater.

I agree with you that the excessive high water pressure could be causing the premature failure.

There are several people from Canada that frequent this forum, please wait for one of them to respond. Thank you.

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Old 01-09-2017, 03:08 PM   #3
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Re: Thermal Expansion Valve leaking again


Oh, it's the thing that is right before the water enters the hot water tank. Normally there's a "water expansion tank" but this one just drains directly into the drain on the floor.

Weird, I cannot edit my original post.

Here's what it looks like
Scroll down to Photo 2: A Thermal Expansion Valve

Last edited by steve_e; 01-09-2017 at 03:14 PM.
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Old 01-09-2017, 05:38 PM   #4
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Re: Thermal Expansion Valve leaking again


Install a thermal expansion tank sized for your water heater. Make sure incoming water pressure is below 80LBS
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Old 01-09-2017, 10:03 PM   #5
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Re: Thermal Expansion Valve leaking again


Hard water can cause these to fail faster. Is your water softened before entering the valve?
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Old 01-22-2017, 03:19 PM   #6
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Re: Thermal Expansion Valve leaking again


Quote:
Originally Posted by Ghostmaker View Post
Install a thermal expansion tank sized for your water heater. Make sure incoming water pressure is below 80LBS
There's no thermal expansion tank, it's a pipe that goes to a drain in the floor.

The first valve thing that the incoming water is connected to (PRV?) says "adjustment range 25-75 psi"

The next thing is labelled as a Thermal Expansion Relief Valve, says 100 psi stamped on the end of it. This thing is what is leaking and causing cold water to go down a pipe into the floor drain. This is where I've seen thermal expansion tanks instead of a direct drain.

I've attached pictures to show the setup
Attached Thumbnails
Thermal Expansion Valve leaking again-file.jpg   Thermal Expansion Valve leaking again-file1.jpg   Thermal Expansion Valve leaking again-file2.jpg   Thermal Expansion Valve leaking again-file3.jpg   Thermal Expansion Valve leaking again-file-1-.jpg  


Last edited by steve_e; 01-22-2017 at 03:28 PM.
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Old 01-22-2017, 03:26 PM   #7
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Re: Thermal Expansion Valve leaking again


Quote:
Originally Posted by BlackTiger View Post
Hard water can cause these to fail faster. Is your water softened before entering the valve?
I don't believe so. I think our water is soft?
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Old 01-22-2017, 03:30 PM   #8
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Re: Thermal Expansion Valve leaking again


An expansion tank would eliminate the valve entirely. Make sure you PR valve is only set to a max 80 LBS not sure what that is in your sizes.
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Old 01-22-2017, 03:32 PM   #9
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Re: Thermal Expansion Valve leaking again


Quote:
Originally Posted by Ghostmaker View Post
An expansion tank would eliminate the valve entirely. Make sure you PR valve is only set to a max 80 LBS not sure what that is in your sizes.
But why would it be leaking in the first place? Wouldn't it fill the expansion tank up right away?
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Old 01-22-2017, 04:03 PM   #10
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Re: Thermal Expansion Valve leaking again


or does it only leak because the PR valuve is pumping through too high PSI for the tank? The Thermal Expansion Relief Valve is 100 psi, so shouldn't it be able to handle the higher pressure from the PR Valve?

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