Recreational Vehicle (RV) Technician Practice Test

What device acts as a protection mechanism that restricts propane flow when a propane line is broken or opened?

1. Excess control valve

2. Excess flow valve

3. Pressure relief valve

4. Flow adjustment valve

The correct answer is: Excess flow valve

The excess flow valve is designed specifically to limit the flow of propane in the event of a line break or an unexpected opening in the propane system. When propane is under pressure, a sudden change in flow, such as a break in the line, can lead to a rapid release of gas, which poses a significant safety hazard. The excess flow valve detects this surge in flow and automatically closes or restricts the propane flow, effectively preventing a dangerous leak. This mechanism is crucial for ensuring safety in propane systems, especially in recreational vehicles where the presence of propane is common for heating, cooking, and refrigeration. Understanding the function of the excess flow valve helps technicians address potential hazards and maintain safe operation standards in RV systems.