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Posted by Ken on May 13, 2006 at 14:06:09:
In Reply to: Saftey relief valves spilling over posted by Dan on May 10, 2006 at 00:56:41:
: We have 2 hot water boilers that are supposed to be running under 30 psi. They are constantly going above that to 34 psi causing the relief valve on boiler 1 to spill over(no matter which one is lead), about 1 gallon every 2 minutes when running. I don't know how to check the expansion tank,its just a big tank with no gauges or anything. It does have a relief valve that when I open it the boiler pressure goes right down. What can I do ?
It is either the expansion tank or the PRV that maintains pressure on your boilers. Ken