Pressure relief Valve is leaking

Old 12-18-12, 07:33 AM
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Pressure relief Valve is leaking

I'm in the trade do some plumbing work but not to much with boilers

First off the boiler is a burn-ham hot water system gas fired boiler.

When the boiler is running the relief valve will open slightly constantly.

The expansion tank was replaced last year and also i just replaced the relief valve but to no a vale.

The boiler is reading 30 psi when it is running.

I have yet to check the psi of the expansion tank but i will do so today.

What should the psi of the expansion tank read ?

Also is the boiler running at 30 psi to high and if so could the expansion tank be the reason y it is.

Thank you any help would be appericated it's for my grandmothers home she really doesn't have the money to pay someone to do it so i'm trying to help her out even though it's an hour and half drive.
Old 12-18-12, 07:37 AM
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Welcome to the forum.

30PSI is where the relief valve blows off and is way too high.

A hot boiler should be ~15-20PSI. Cold is ~12-15PSI.

I'm not 100% sure what the expansion tank pressure should be, so I'll let the pros pipe up on that question.
Old 12-18-12, 07:39 AM
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HI Kevin,

At the top of the message list there is a 'sticky' posting message that should help you immensely.

It is titled "Relief valve leaking..."

Read that and follow the instructions and you should gitterdone no problem.

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