What is the primary function of a gas regulator?

The primary function of a gas regulator is to control the pressure of gas supplied to appliances. This is crucial because gas appliances are designed to operate within a specific pressure range to function safely and efficiently. The regulator ensures that the gas pressure remains consistent, preventing fluctuations that could lead to appliance malfunction or hazardous conditions.

By reducing high-pressure gas from the supply line down to a lower, usable pressure, the regulator protects both the appliances and the users. Maintaining the correct pressure helps ensure optimal combustion within appliances, which can contribute to efficiency and safety. Without a properly functioning regulator, appliances may not receive the appropriate gas pressure they need, leading to issues such as incomplete combustion, increased emissions, or even system failures.

The other options, while related to gas distribution, do not align with the crucial role of a regulator in pressure management. For instance, controlling temperature or measuring flow rate involves different mechanisms and components, while filtering impurities pertains to gas cleanliness rather than pressure regulation.