Maybe your self closing beer faucet isn't allowing the faucet to open completely and it's making it foam by pushing beer out a smaller orfice ?
Spotted Dog Brewing
"This is grain, which any fool can eat, but for which the Lord intended a more divine means of consumption.. Beer!"
-Robin Hood, Prince of Thieves, Friar Tuck
"The nations of the West also have their own intoxicant, made from grain soaked in water...Alas, what wonderful ingenuity vice possesses! A method has actually been discovered for making even water intoxicated."
- Pliny the Elder