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Posted by Harold hydronicnetwork.net on January 24, 2004 at 07:49:11:
In Reply to: Desperately need single pipe steam expert. posted by John P. Doran on January 24, 2004 at 03:05:04:
EVERY TIME you steam pressure goes over 4 psig, you DAMAGE your vents, so they have to be replaced. That is why they will not open and you have a VACUUM.
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