TP Valve on a Steam Heat System
I have an old steam heat system (looks to be at least fifty years old, gas-fired, a one pipe system). It’s the type you have to turn a valve to fill with water every once in a while. Lately the Pressure release has been blowing off regularly on the top of the boiler, filling my basement with steam (maybe I should take up steam bending).
We had a plumber over on a separate job a while back (new bathroom). He looked at it, scratched his head, promised to take care of it, and then disappeared when the job was done. Not filling it as high does help somewhat, but I used to fill it that high before.
Do these valves just fail with time? Is there something that increased the pressure in the system? Can I just wrench the thing off and go to my local plumbing supply and buy another valve? Are there standard valves I can use? Is there any chance I’m going to blow up my boiler if I get the wrong pressure relief type?
Any replies greatly appreciated,