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I can't speak for the differences between these 2 valves, but I recently installed 13 of the PGV valves and have had no problem with them.

PGV's are a little heavier duty than the SRV. Including a better diaphram. The SRV is designed to be used in productio, low cost irrigation installations where developers are trying to save a dime at every turn. Bottom line is they will both perform, but I'd put my money on the PGV every time. They are a great valve and are very reliable.