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The boiler relief valve what it does. Why it leaks and how to replace it.

The boiler relief valve or the blow off valve is a safety valve that protects your heating system from building up to much pressure and possibly blowing up. It's a very important part of your heating system. Some times the relief valve or blow off valve will leak, and naturally people assume that it is because the relief valve is defective.

Boiler Relief ValveSometimes this is true, and if it is leaking you should replace it even though it is leaking for other reasons.

But it may just be doing it's job. There are 5 reasons a relief valve leaks.

The First Reason:

Nothing lasts for ever, and a relief valves or blow off valve ------
Please click here for rest of the instructions.

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 Boiler Expansion Tank

The second reason:

The expansion tank on a boiler allows the water in the boiler to expand.----- Please click here to read the rest of the instructions

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Watts 1156 boiler relief valve

The third reason:

The pressure reducing or fill valve for a boiler is set to only allow ----- Please click here to see the rest of the instructions

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 Boilermate with Burnham boiler

The Forth Reason:

Some boilers have a hot water coil, sometimes called a ----- Please click here to see the rest of the instructions

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Secondary Boiler Aquastat

The fifth reason:

The aquastat or aquastat relay, This is a very important part of your heating system----- Please click here to see the rest of the instructions

Please click here to see larger image Boiler temperature pressure guage

Boiler gauge settings:

The pressure should be from 12 psi to 18 psi
The Temperature should be between 160 and 180 degrees f. but can be up to 200 degrees f.

To replace a relief valve:

To replace a relief valve. Turn the power to the boiler off, let the boiler cool, turn the water to the boiler off, remove the drip tube from the outlet side of the relief valve. (this must be put back after the relief valve has been replaced) Drain the pressure off the boiler, remove the relief valve, make sure you replace the relief valve with a boiler relief valve of the same rating, DO NOT USE A WATER HEATER RELIEF VALVE ON A BOILER. after you replaced the relief valve and put the dip tube back on, turn the water back on and purge the system, then turn the power back on.

Don't want to try this yourself? Use the 24/7 help line   See a stuck boiler gauge

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 Use the 24/7 Hot Line   See a stuck boiler gauge
Read the front of the boiler relief valve tag
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tom@masterplumber.net

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