Plant Operation Practice Test

In fuel oil systems, what does the relief valve do?

1. Simultaneously increase pressure

2. Bypass excess fuel

3. Regulate temperature

4. Control combustion cycles

The correct answer is: Bypass excess fuel

In fuel oil systems, the relief valve is specifically designed to bypass excess fuel. This function is crucial for maintaining safe operating conditions within the system. When the system pressure exceeds a pre-set limit, the relief valve opens to allow the excess fuel to flow back to the tank or another designated location. This prevents over-pressurization, which could lead to catastrophic failures, such as leaks or ruptures. Understanding the role of the relief valve is important in the context of fuel oil system safety and efficiency. While other components in the system may be responsible for regulating pressure, temperature, or combustion cycles, the relief valve's primary purpose is centered on managing excess fuel to ensure that the system operates within its designed pressure limits.