MartinS
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Considering these two designs, I'd expect them both to work almost identically, assuming there is a hose attached to the outlet with its other end beneath the bottom of your keg, and the starting level of the wort is above the top of the outlet.
On your design (right), it's obvious that it'll keep draining until the level gets down to the top of your brass piece, regardless of those assumptions.
On the other design (left), as soon as you open the tap, the wort will push itself up the copper pipe, and out the outlet. As long as the hose on the outlet runs lower than the bottom of the keg, you'll get a syphon, which will keep sucking wort out until the level drops below the bottom of the short copper segment.
Yours has the advantage that you can run wort directly out of the outlet if you want (without a hose), and you can start the flow with less liquid in there (might be good for cleaning), but I see no difference in how much wort you'll get out in an actual brew.
Edit: fix images
