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Old 04-23-2012, 10:38 PM   #1
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Hot water heater pressure relief valve will not hold back water!!!

I recently de-winterized my 2010 Berkshire 390bh and when I finished filling with water I noticed the pressure relief valve on the outside will not hold back water pressure from pump. So for $20 I purchased a new one thinking that it was faulty. After replacing with new one and pressurizing the system with the pump, it leaks too!!! I am assuming that the pump pressure is too high and therefore the pressure relief valve cannot hold the water pressure back. Anyone else have this problem? Can the pressure be turned down on the Shurflo pump?

Thanks,
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Old 04-23-2012, 10:40 PM   #2
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pressure from pump would never make valve leak .
Just by chance is it leaking around the threads ?

Normally you can open it and flick it closed several times to get it to stop .
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Old 04-23-2012, 10:43 PM   #3
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Originally Posted by mx800 View Post
I recently de-winterized my 2010 Berkshire 390bh and when I finished filling with water I noticed the pressure relief valve on the outside will not hold back water pressure from pump. So for $20 I purchased a new one thinking that it was faulty. After replacing with new one and pressurizing the system with the pump, it leaks too!!! I am assuming that the pump pressure is too high and therefore the pressure relief valve cannot hold the water pressure back. Anyone else have this problem? Can the pressure be turned down on the Shurflo pump?

Thanks,
The water pump is a pretty low pressure source.
Does it leak when you are using city water?
Maybe the boiler has lost its air gap.

Deplete the pressure and drain the water out of the water heater.
Open and close the pressure relief valve.

open the hot water faucet in the kitchen and refill the hot water heater without using the pressure relief valve.

This should trap some air at the top of the boiler and should stop it from leaking.
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Old 04-23-2012, 11:09 PM   #4
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Thanks for the info, but I tried your solution from another post, and it did not work. I hear the pump going and then slowing down as the pressure builds and then I hear a squealing from the pressure valve then water coming out. Should the pump not stop sooner?
I did have the pump apart "pressure diagram part" thinking there was a problem a few days ago, but discovered that I had a power issue so I put it back together and that is when I noticed this relief valve problem. Do you think I did anything to the pump? I just opened up the one end and looked at it!?

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Old 04-23-2012, 11:11 PM   #5
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I doubt this has anything to do with your water pump.
it IS possible you got a bad relief valve right out of the box.
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Old 04-23-2012, 11:36 PM   #6
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When you say drain the water from heater do you mean all the water? or just until the relief valve stops draining water?

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Old 04-24-2012, 05:44 AM   #7
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There has to be a -------------

To prevent the pressure relief valve from weeping, there has to be a AIR POCKET in the top of the hot water tank. Turn off the water supply at the faucet, water pump Etc. Open the hot water faucet in the kitchen, leave
open. Now go to the pressure relief valve, lift up on the leaver, Drain the water until it stops running. Snap the spring loaded pressure relief valve
open and close a couple times. Now go back to the kitchen, close hot water faucet. Turn water pressure back on at the supply faucet or pump.


You have to establish an air pocket in the top of the hot water tank to prevent the pressure relief valve from leaking.

When you have hot water on the pressure relief valve under pressure, the valve seat is heated unevenly therefore causing the valve to leak!!

Good luck!
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Old 04-24-2012, 09:50 AM   #8
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What Sid said...
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Old 04-24-2012, 10:16 AM   #9
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Explain something, if it will leak water, why would it not leak air? It should be seated and air or water should not seep. I have been doing it wrong for years, because I use the lever to release all the air. When the relief does trip because of excess pressure, does it not release all the air? I am thoroughly confused, which doesn't take much to do that anymore.
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Old 04-24-2012, 10:34 AM   #10
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Explain something, if it will leak water, why would it not leak air? It should be seated and air or water should not seep. I have been doing it wrong for years, because I use the lever to release all the air. When the relief does trip because of excess pressure, does it not release all the air? I am thoroughly confused, which doesn't take much to do that anymore.

You and me both

I pull the relief valve to check if I have water in the tank. I can only assume there is no air left in the tank after the water comes out of the valve.
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