Which feature is primarily attributed to the efficiency of a gravitational feed spray gun?

The efficiency of a gravitational feed spray gun is primarily attributed to the gravity-driven paint flow. This design allows the paint to flow from the paint cup into the spray nozzle under the influence of gravity, eliminating the need for a mechanical pump. This results in a consistent and smooth application of paint, as the gravity feed enables a more controlled and even distribution of material.

Moreover, this gravity-based system tends to reduce waste since the paint flows directly into the nozzle without relying heavily on air pressure, which can sometimes lead to overspray and inefficiencies. The ability to easily and quickly adjust the flow of paint simply by tuning the nozzle size or adjusting the air pressure can optimize performance, but the key efficiency benefit stems from the natural, effortless flow of the liquid paint.