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Posted by HeatPro on September 09, 2009 at 09:56:53:
In Reply to: Pump problem? posted by Daniel on September 08, 2009 at 21:21:01:
A pump or circulator is continually open from one side to the other. You need a valve to ztop gravity flow, like a zone valve in a zone valve system,
http://www.heatpro.us/mulzvtree/documents/76D7905D21E9F505022AC2405A53DC7F9C6C5587.html
or a flow control valve for each circulator when there are multiple circulator zones.
http://www.heatpro.us/multctree/documents/EFC1A42B3F19738B04E1C358E0FB27AF988B5ADF.html