The amount of flow that you can get through any particular pipe is dependent on the head pressure of the water above it. It is actually the reason that Herbie works. I can't tell you how much flow you'll get in your particular situation.
You'll just have to build it to find out!
JL purchases those valves from Corix. Corix sold a 1.5" gate valve to me for $35...(but I was quite a regular customer there!)
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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