What is the primary purpose of the orifice plate on the 302AF fueling and defueling valve?

The primary purpose of the orifice plate on the 302AF fueling and defueling valve is indeed to create pressure to operate the pressure differential shut-off, known as CDHS-3.

In the context of fuel systems, the orifice plate works by controlling the flow of fuel through the system, which in turn affects the pressure differential across various components. By creating a specific pressure differential, it enables the pressure differential shut-off system to function properly, ensuring the safe operation of the fueling and defueling process. This is crucial for regulating fuel flow and preventing hazards, such as over-pressurization, which can lead to leaks or spills.

The other options focus on creating flow for different components, which do not accurately describe the orifice plate's role. The correct choice highlights the importance of pressure management in the system, which is key to the functionality of the pressure differential shut-off mechanism. Understanding this emphasizes the critical nature of orifice plates in maintaining system integrity and safety in fuel operations.