NCCER Plumbing Level 2 Practice Exam

In a gas meter, the component that moves in response to the amount of gas flow is known as the diaphragm. This flexible sheet functions by expanding and contracting as gas passes through the meter, which allows it to measure the volume of gas accurately. The movement of the diaphragm is essential for the meter's operation, translating gas flow into readable measurements.

The diaphragm's design is crucial; it effectively captures the fluctuations in gas pressure, ensuring that the meter can provide precise readings irrespective of varying flow rates. This makes it a vital component in maintaining the efficiency and accuracy of gas measurement systems.

Other components, such as valves and regulators, serve different functions. Valves control the flow of gas, while regulators maintain a specific pressure within the system. Flow meters, on the other hand, measure the rate of flow without the flexible movement characteristic of a diaphragm. Understanding the function of the diaphragm helps in appreciating the overall operation of gas meters in various applications.