Recreational Vehicle (RV) Technician Practice Test

What is a critical component to check before filling a propane cylinder?

1. Color of the valve

2. Presence of a dust cap

3. Condition of the relief valve

4. Label accuracy

The correct answer is: Condition of the relief valve

Checking the condition of the relief valve is vital before filling a propane cylinder. The relief valve is designed to release gas in case of overpressure, preventing potentially dangerous situations such as explosions or leaks. If the relief valve is damaged or malfunctioning, it could fail to operate correctly, leading to dangerous pressure buildup in the cylinder during filling or usage. A properly functioning relief valve ensures safety and compliance with regulations, making it a critical component to inspect before proceeding with filling the propane cylinder. While other factors might seem relevant, such as the presence of a dust cap that helps prevent contaminants from entering the valve or checking label accuracy for proper identification and safety information, these do not hold the same level of urgency for ensuring that the cylinder can be safely filled and operated. The condition of the relief valve directly impacts the cylinder's safe use and storage of propane.