In what position should the angle valve be when closed on PA5 cars?

The angle valve on PA5 cars should be in line with the running rails when it is closed. This position indicates that the flow path through the valve is aligned with the flow of the system, minimizing disruption and ensuring proper sealing when the valve is not in use.

When the angle valve is aligned in this manner, it allows for a clear flow path, similar to how trains and carriages operate on tracks that are aligned with the direction of travel. This configuration is essential for maintaining the integrity and efficiency of the system, as it prevents any inadvertent leakage or blockage that could result from a misaligned valve.

In contrast, positions such as out of alignment or diagonal to the running rails would suggest improper closure or an obstructed path. A perpendicular position could also imply that the valve is partially open, which is not the desired state when a complete closure is required. Understanding the correct position for angle valves is crucial for ensuring safe and efficient operations in engineering contexts, particularly in railway systems.