What is used to prevent pressure building up from trapped air between the end of the boom and the outermost nozzle when the spray valve is open?

To prevent pressure from building up due to trapped air between the end of the boom and the outermost nozzle when the spray valve is open, air bleed lines are used. These lines effectively allow any entrapped air to escape, maintaining proper hydraulic flow and preventing pressure buildup that could lead to equipment malfunction or uneven spraying.

Air bleed lines are critical in maintaining consistent spray patterns and ensuring that the liquid being applied can flow smoothly without interruption from air pockets. This is important because trapped air can affect the performance of the application equipment, leading to uneven distribution of chemicals or materials being sprayed.

Pressure gauges, valves, and flow meters serve different purposes in the spraying system. While pressure gauges monitor the system pressure, valves control fluid flow, and flow meters measure the rate of liquid being applied, they do not directly address the issue of trapped air in the boom. Hence, air bleed lines are specifically designed to mitigate the issue of pressure buildup from trapped air, ensuring optimal operation of the aerial application equipment.