Does the high-pressure airless spraying machine need compressed air to drive it?

Hello, high-pressure airless sprayer can be divided into three types according to power: electric high-pressure airless sprayer, pneumatic high-pressure airless sprayer and gasoline engine high-pressure airless sprayer. Pneumatic high-pressure airless spraying machine needs compressed air output by air compressor as the power to push the plunger rod to move, but it only uses compressed air as the power, and there is no air in the pump body, high-pressure pipe (delivery pipe), spray gun and sprayed paint. Pneumatic high-pressure airless spraying machine needs compressed air to push,