I just want to make one thing clear, I came here to get an explanation of an engineering design devised by STUDOR (not me!) for an ejector pit pump.
The first "experienced plumber" to reply didn't even bother to look at the design, and from what HJ is saying, neither did he. Obviously, none of you are interested in understanding something new to you, so you just dismiss it as a "hack", or that it won't "pass code", when there is ABSOLUTELY NO EVIDENCE THAT IT WILL NOT WORK, OR THAT IT WILL NOT PASS CODE.
This is how the design actually works (for those of you who care):
(1) AIR COMES IN through the ONE WAY AAV valve into the sealed pump box.
(2) AIR EXITS the sealed pump box via the wet vent loop in the discharge line, which eventually connects to the main stack.
For everyone's information, STUDOR'S EJECTOR PUMP AAV DESIGN is working great in my laundry. The sink drains fast as hell and there are no smells or "weird drainage" going on.
I am sure the first AAV designs back in the 70's were met with the same closed-minded, dismissive and arrogant attitude's you all seem to be expressing now. Innovation happens and things change. Get over it. For those of you who didn't give me attitude for trying to understand something new, thanks for reading.
PS: Here is another thread on a board regarding Studors ejector pump AAV design, how it works, and how it is ACCEPTABLE under IRC Code:
http://www.selfhelpforums.com/showthread.php?p=48370#post48370
Try learning something new... it's free.
-A