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Pressure Regulator Valve on Automatic Fill


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Posted by Sue L on February 16, 2004 at 05:14:46:

I have a Utica gas-fired boiler. It has a water line running to it to refill in the event of low pressure (the boiler has no low pressure shut-off.) This line has a manual ball valve and a pressure regulator valve. My installer (who I have grown to have little faith in) tells me I need to leave the ball valve open. The pressure regulator literature says to close it after filling. Which is correct?

The "rest of the story" is that, initially, I left it open. It seemed to overfill (16 psi), and when the system heated up, it blew the pressure relief valve. It would then refill, and do it all over again. I hae an old house with cast iron radiators, but have a large expansion tank to compensate. I have shut off the fill valve, and drained the boiler to the point where it cycles from about 10psi cold to 25 psi hot. Is this the correct (and safe) way to run these boilers?

-Sue


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