Master Plumber Net

Your Search Is Over, Your Answers Are Here.

The boiler relief valve, what it does, why it leaks, and when to replace it.

The boiler relief valve or the blow off valve is a safety valve that protects your heating system from building up too 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. Sometimes 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 a boiler relief valve leaks is:Boiler Relief Valve

Nothing lasts for ever, and a relief valves or blow off valve will go bad. A boiler relief valve needs to be tested every three months ........ READ ON

The Second Reason a boiler relief valve leaks is:

The expansion tank on a boiler allows the water in the boiler to expand. Water can not be compressed and when it is heated ........ READ ON

The third reason a boiler relief valve leaks is:

The pressure reducing or fill valve for a boiler is set to only allow 12 psi in to the boiler. If this valve fails it will ....... READ ON

The fourth reason a boiler relief valve leaks is:

Some boilers have a hot water coil, sometimes called a tank less water heater. Some times a coil will develop a pin hole in it. If this happens it will cause ....... READ ON

The Fifth reason a boiler relief valve leaks is:

The aquastat or aquastat relay, This is a very important part of your heating system. the item in the picture on the next page is ....... READ ON

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. ....... READ ON

What does your boiler relief valve tag say?