Ignite Success: Ace the 2026 MCC-NH Gas Fitters Exam!

The primary function of an excess flow valve is to stop gas flow when it exceeds the valve's rating. This is crucial for safety, as it prevents excessive gas from flowing through the system, which could lead to dangerous situations such as leaks, explosions, or other hazards.

Excess flow valves are designed to automatically close in the event of a significant increase in flow rate, typically caused by a rupture or break in the gas line. By doing so, they help protect both the installation and the environment from potential risks associated with uncontrolled gas release.

While regulating gas pressure and enhancing gas flow safety are important factors in gas fitting practices, those functions are specific to other types of valves and safety devices. Redirecting excess gas flow does not accurately describe the function of an excess flow valve, as its primary role is to halt the flow rather than direct it elsewhere.