Question about Heating & Cooling
I assume you are talking about T&P valve. This stands for temperature and pressure relief valve and is a safty valve. Under no circumstances should they ever be plugged to stop leak. Chances are its just getting old and the spring that hold it shut is getting weak or rubber seat that seals it is getting worn. Valve should be replaced. If you feel comfortable doing this you should turn gas valve to pilot,shut off water supply and electric power. Remove valve.You will probably need a pipe wrench as they can be very tight.If it is standard 3/4 inch thread you can get a new one at most hardware stores. There should be a rating tag on the valve that will tell you the size,pressure and temperature rating. You may have to go to a plumbing supply outlet to get the right one. One other thing I should have said at the start is after you shut off water supply you should drain a few gallons out of boiler .be careful as water will be very hot.If your drain valve doesn't work wait 1-2 hours before you remove old valve.You will splill some water,but at least you wont scald yourself.Reinstall new valve using teflon tape or pipe thread compound to seal threads.Turn water supply back on ,gas valve back to on and electric power supply. Check for leaks,and you should be done. Hope this helps.Thanks
Posted on Nov 08, 2010
This is a relief vave,probably rated for 30 psi.You either have air in your heating system causing the pressure to go up.
Or you need a new relief valve,sometimes the springs wareout or rust and iron from the water keep them from reseating properly.
You should have 15 to 20 psi of pressure on the boiler if its 30 or over you need to bleed air from the highest radiator or baseboard,if there is a 2nd floor go up to one and find the bleeder and bleed out air.Be carefull once the water starts coming it will be hot.
Posted on Nov 08, 2010
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Posted on Jan 02, 2017
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