I'm throwing this out there for discussion as something I don't really understand.
All I know is beer comes to the pub in an aluminum keg. There is CO2 cylinders involved.
So, from standing at the bar on a Saturday night watch the guy pour a pint... I'm thinking...
The keg comes flat, CO2 is used to pressurize the system with the tap on one end and the keg on the other. CO2 is used to force the beer out of the keg and to the pump. I'm suspecting that CO2 is also injected directly either before or at the tap.
The thing that puzzle me in the two position tap... pulled towards them seems to be "normal pour" with plently of gas, but momentarily push away from the pourer it pumps lots more gas.
Here a pint is pulled with the glass tilted so that no head forms until the last few inches when the glass is righted and the volume is topped up. This generally, with lagers results in head forming, if it doesn't or is not enough, the barman pushes the tap away from him which seems to inject much more gas for head. If he gets too much head, he pours it off and re-tops up.
All I know is beer comes to the pub in an aluminum keg. There is CO2 cylinders involved.
So, from standing at the bar on a Saturday night watch the guy pour a pint... I'm thinking...
The keg comes flat, CO2 is used to pressurize the system with the tap on one end and the keg on the other. CO2 is used to force the beer out of the keg and to the pump. I'm suspecting that CO2 is also injected directly either before or at the tap.
The thing that puzzle me in the two position tap... pulled towards them seems to be "normal pour" with plently of gas, but momentarily push away from the pourer it pumps lots more gas.
Here a pint is pulled with the glass tilted so that no head forms until the last few inches when the glass is righted and the volume is topped up. This generally, with lagers results in head forming, if it doesn't or is not enough, the barman pushes the tap away from him which seems to inject much more gas for head. If he gets too much head, he pours it off and re-tops up.