What is the function of an emergency shutoff valve?

The function of an emergency shutoff valve is primarily to provide a means to quickly stop the flow of gases or liquids in the event of an emergency. This is crucial for safety, as it allows for immediate control of potentially dangerous situations, such as gas leaks or system failures. The ability to shut off the flow can prevent accidents, lessen environmental impact, and protect both personnel and equipment from harm.

In scenarios involving compressed natural gas, having an effective emergency shutoff valve in place ensures that emergency responders and operators can quickly mitigate risks associated with pressurized substances. Other functions mentioned in the options, such as regulating gas flow or measuring pressure, serve different purposes and do not align with the primary role of an emergency shutoff valve.