G2 Gas Fitter Practice Exam

What regulates gas delivery at atmospheric pressure?

1. Pressure relief valve

2. Flow control valve

3. Zero governor

4. Safety valve

The correct answer is: Zero governor

The zero governor is a device specifically designed to regulate gas delivery at atmospheric pressure by controlling the flow of gas to maintain constant pressure levels. It operates by responding to variations in demand for gas, ensuring a consistent delivery without allowing pressure to exceed safe operational limits. This is particularly important in applications where a stable gas supply is essential for the proper functioning of appliances. Unlike pressure relief valves or safety valves, which are primarily designed to protect systems from overpressure conditions, the zero governor proactively manages the gas flow to maintain pressure at a desired set point at atmospheric levels. Flow control valves, while important for managing flow rates, do not specifically address the need to maintain atmospheric pressure delivery. Thus, the zero governor's focused role in regulating gas delivery at atmospheric pressure makes it the correct answer.