Which device measures and controls the flow of gas within a building?

A regulator valve is a critical device in managing the flow of gas within a building. Its primary function is to maintain a consistent and safe pressure level of the gas being delivered to appliances and systems. This is essential because gas pressures can fluctuate due to changes in demand, temperature, or system conditions, and excessive pressure can lead to dangerous situations, including leaks or equipment failure.

The regulator valve works by automatically adjusting the flow of gas to keep the pressure at a predetermined set-point, ensuring that appliances receive gas at the pressure level designed for safe and efficient operation. This regulation is critical in both residential and commercial settings to ensure safety and optimal performance of gas-powered equipment.

In contrast, devices like gas leak detectors serve a different purpose by detecting the presence of gas leaks, while gas shutoff valves are used to manually stop the flow of gas in emergencies or maintenance situations. A manifold, typically, is a distribution unit used for a series of gas lines but does not control flow or pressure directly. Therefore, the regulator valve is the appropriate choice for measuring and controlling gas flow within a building.