What is the purpose of bleed valves at the ends of the spray boom?

The correct answer addresses a crucial aspect of spray boom operation. Bleed valves at the ends of the spray boom serve to prevent pressure from building up due to trapped air when the spray valve is opened.

When a sprayer's boom operates, fluid is forced through the system, which can lead to air becoming trapped at various points in the boom. This trapped air can cause inconsistencies in spray pressure and may lead to uneven application of chemicals. By incorporating bleed valves, any trapped air can escape, allowing for a more steady and accurate spray pattern. This not only enhances the effectiveness of the application but also helps protect the integrity of the equipment and ensures that the chemicals are delivered as intended.

This function is essential for maintaining spray efficiency and operational safety during aerial applications, as it directly affects how well the chemicals are distributed across the treatment area. The other options do not accurately describe the primary role of bleed valves, as they focus on aspects of distance, maintenance, or monitoring that are not directly related to the function of these valves.