I have seen these in person.
The cup has a one way valve and the machine is set to a predetermined amount say 16oz.
It has a few advantages;
No over pouring by staff
When the keg "kicks" it doesn't spray all over the place because the gas doesn't have enough pressure to go up.
It's fast and foul proof
I've seen them used a beer
shows or conventions.
In the time it takes one beer to be poured from a traditional tap at least 4 are done by that machine.
The cups and machine are big dollars. But the big companies had a hand in developing the technology.
Posted from my iPhone/Mobile device
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