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Posted by Harold hydronicnetwork.net on January 27, 2004 at 09:57:53:
In Reply to: Circulator failure signs - do I have them? posted by Richard Spenrath on January 27, 2004 at 09:20:17:
Circulators often make more noise as the valve ahead of them opens further, giving less resistance. The water increases in velocity as the resistance drops, which can make added noise over the bends and turns. It might be a noise problem, without a circulation problem. Adding a balancing valve a foot or so away from the discharge upstream of the circulator could provide that extra resistance to maintain a quiet velocity while the 4-way opens.