What happens to the fluid needle when the trigger is engaged?

When the trigger of a spray gun is engaged, the fluid needle is pulled out of the fluid tip, allowing paint or other material to flow through the nozzle. This action enables the operator to control the amount of fluid that is sprayed. The needle is designed to move in harmony with the trigger, providing precise control over the fluid flow.

The role of the needle is crucial in creating a consistent spray pattern; as it retracts, it opens the passageway for the material to exit. This is fundamental to achieving an even and controlled application, which is essential in painting and refinishing tasks.