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Circulator pump. Can water pass through it when the pump is switched off?

Does a central heating water pump itself prevent water flowing through to the radiators by gravity? This may seem a daft question, but it relates to changes suggested for a continental system which currently has a mixer valve operated by external temperature which is to be replaced by a room stat/programmer.
Chas, March 2009
some now have built in check valves

old guy, March 2009