Which of the following is NOT a characteristic of a poppet valve?

A poppet valve is specifically designed for certain functions in the context of draft beer systems and kegging. Its primary responsibilities include managing the flow of gas and liquid within a keg system.

The first characteristic, allowing CO2 to flow into the keg, is a fundamental function of the poppet valve. It enables carbon dioxide to enter the keg when a beer is being poured and serves to maintain the necessary pressure within the keg to dispense the beer properly.

The second characteristic, preventing beer from backing up into the gas line, is also crucial. The design of the poppet valve allows gas to enter while creating a barrier that stops the beer from flowing back into areas where it could contaminate the gas lines or affect the system’s pressure.

The fourth characteristic relates to protection against damage to regulators. A poppet valve helps in ensuring that excessive pressure does not affect the regulator, thus preserving the integrity and performance of the entire draft system.

Regulating the temperature of the beer, however, is not a function associated with poppet valves. Temperature regulation involves different components such as chillers or temperature-controlled storage, and not the action or design of a poppet valve. This is why the third statement is the accurate choice.