What is the primary purpose of gas shutoff valves?

The primary purpose of gas shutoff valves is to prevent gas flow during emergencies. These valves are critical safety devices that allow for the quick and effective termination of gas supply to appliances or entire systems in the event of a leak, malfunction, or other hazardous situation. This action helps to mitigate the risk of fire or explosion, providing a crucial safety measure for both residential and commercial gas installations.

While other options might describe functions that gas systems might need, they do not represent the fundamental role of a shutoff valve. For instance, adjusting temperature is related to appliance operation rather than safety, regulating gas pressure involves different components such as regulators, and filtering impurities is handled by filters, not shutoff valves. Therefore, the emphasis on the safety function of shutoff valves makes them indispensable in gas systems.