Patent AT-E40093-T1: [Translated] DISPENSING DEVICE FOR BEVERAGES.

@ A beverage dispensing system has a valve in a tap 6 controlling dispensing of the beverage through a passage 5 from a rigid or flexible container. Air, nitrogen (or other inert gas) or carbon dioxide gas from a passage 15 is introduced into the beverage in the passage 5 during dispensing for development of a head or froth. The introduced gas flows under pressure (which is preferably adjustable) from the passage 15 and by way of a capilliary tube restrictor 18 and a non return valve 21 communicating with the tube 18 into the beverage in passage 5. The non return valve 21 has a resilient diaphragm 27 which normally closes that valve and is displaceable under gas pressure to admit the gas to the beverage. A labyrinthine mixer 39 is located in the passage 5 downstream of the position where the gas is introduced.