How does a gravity feed spray gun operate when the trigger is pulled back?

When the trigger is pulled back on a gravity feed spray gun, it makes contact with the air valve system. This mechanism is essential for the operation of the spray gun as it allows compressed air to flow through the gun, leading to the atomization of paint. The gravity feed design means that the paint is stored in the reservoir above the spray gun, and when air is supplied, it creates a vacuum that draws the paint down and mixes it with the atomized air, allowing for an even and controlled spray pattern. This action is critical for achieving the desired finish on the surface being painted, as it ensures a consistent and adjustable paint flow.

In contrast, activating the paint compressor would not be relevant to the action of the trigger itself, as the compressor operates independently to provide compressed air when needed. Additionally, viscosity of the paint is influenced by formulation and temperature, not directly manipulated by the trigger pull. An opening of the fluid reservoir does not occur because the paint gravity feeds on its own, so its flow depends on the air pressure rather than an opening action. Understanding this mechanism is key to mastering the use of gravity feed spray guns effectively in painting and refinishing processes.