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Posted by Jack, CVMS on December 18, 2003 at 06:41:46:
In Reply to: Sticking Zone Valve posted by Dave on December 18, 2003 at 05:44:40:
From your description it sounds like the second alternative you mention is the source of the problem - a sticking valve.
As these zone valve bodies are relatively trouble-free, it would be wise to take a good look at your hydronic fluid. It may be getting pretty dirty, possibly from oxidized metal or chemicals.
The TACO zone valves can be taken apart and cleaned, but most often it will be best to replace the valve, as internal corrosion can continue to cause problems.
If you attempt to clean the valve (best left to a professional) be sure to have isolation valves on both sides of the zone valve, and turn them off.