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Old 01-20-2013, 11:06 PM
Wet_Boots's Avatar
Wet_Boots Wet_Boots is offline
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Join Date: Mar 2005
Location: metro NYC
Posts: 44,022
The closing force in a zone valve comes from the force differential on either side of the diaphragm assembly. Pressure loss through the valve is a part of that force. An oversized valve won't have the pressure loss of a standard valve, so that part of the force is absent or diminished. An oversized valve can even develop seat wear in certain low-flow situations, due to it opening incompletely (a phenomenon whose name I can't recollect at the moment)
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