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Old 01-20-2013, 10:06 PM
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Wet_Boots Wet_Boots is online now
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Join Date: Mar 2005
Location: metro NYC
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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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