How does a tap head work?

A tap head is a central component of a beer dispensing system and allows beer to be drawn from a keg and piped under pressure through a line to the tap. It is placed on the valve of the beer keg and firmly secured. There are various types of tap heads available, depending on the keg's fitting system (e.g., flat, combo, basket, or bayonet closure). The tap head creates a tight connection to the keg to prevent beer or gas from leaking.

The tap head typically has two connections: a beer inlet, through which the beer flows from the keg into the line to the dispenser, and a gas inlet, which directs the CO₂ (or other pressurized gas) into the keg to maintain a constant pressure. This pressure ensures that the beer is continuously forced from the keg into the line. Once the tap head is correctly attached, the tap head's lever or handle is operated to open the keg's valve. This action simultaneously releases the gas flow, pressurizing the keg and allowing the beer to flow into the dispenser.

The tap head ensures that the beer and gas remain separate, and the gas maintains a stable pressure in the keg while the beer is pumped into the line to the tap. After use, the tap head is removed by returning the lever and pulling it away from the keg, which seals the keg and stops the gas flow. This function allows the beer to be dispensed under constant pressure and thus optimally carbonated, ensuring a fresh beer and a consistent head.