The working principle of a backpack sprayer.
Dec 30,2025
Electric type: A motor drives a booster pump, enabling the liquid medicine to be atomized and sprayed through the nozzle under pressure. Some models are equipped with intelligent control systems that allow adjustment of spraying modes and pressure settings.
Gasoline-powered: A gasoline engine drives a centrifugal fan to rotate, generating a high-speed airflow. Part of this airflow is directly ejected, while the other part enters the chemical tank, building up pressure that forces the liquid medicine through the nozzle and into an atomized mist. At the nozzle, the airflow and liquid medicine undergo a second mixing process, resulting in even finer mist droplets.
Manual type: A hand-operated piston reciprocates within the pump cylinder, generating pressure by changing the volume and thereby forcing the liquid medicine from the medicine tank into the spray bar and out through the nozzle.
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