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Posted by HeatPro on September 24, 2010 at 21:21:19:
In Reply to: Replacing Pressure Relief Valve posted by jcwhui on September 24, 2010 at 16:14:48:
As long as the boiler plate input is less than the 510,000 btuh, you can use that one, as they are both 3/4" and 30 psig. The tappings are the same so it can go on the boiler in the same orientation as the old one.
If the relief valve isn't opened and flushed for a long time, a piece of dirt or rust can sit in the seat when flushed, keeping it unseated slightly so it leaks. It's a good idea within a decade to change it out, as the mechanism might stick making it dangerous, or the pressure spring can change tension.
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