Pressure Relief Valve


Old 11-20-08, 08:14 AM
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Pressure Relief Valve

The pressure relief valve on my hot water heating system boiler keeps blowing off from time to time, discharging a few ounces each time. It does not drip and shuts down completely. What could be the problem? Should I replace it?
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Old 11-20-08, 03:20 PM
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Should I replace it?
I think it's a good idea to routinely replace them ... say five years or so...

but, I doubt that's the problem with the discharge, it's probably doing what it's designed to do, and that is to relieve pressure over 30 PSI.

Can you tell us what the pressure and temperature gauge on the boiler is reading? Take readings on a cold boiler, and when the water temperature is hottest.

Tell us a bit more about the boiler ... can you describe the expansion tank ? It may be two types, one looks like a propane can from a gas grill, and may hang on the pipe. The other is bigger, and would be found strapped into the ceiling joists above the boiler.

Pictures would help ... free account ... Image hosting, free photo sharing & video sharing at Photobucket ... upload there ... post a link here ...
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