How do non-positive displacement pumps function?

Non-positive displacement pumps are designed to move fluid primarily through the motion and design of their impeller blades. In such pumps, fluid enters the pump and is propelled forward by the rotational action of the blades, which creates a change in pressure and velocity. This action results in fluid being continuously moved through the system without necessarily delivering a specific volume per rotation, which is characteristic of positive displacement pumps.

This principle allows non-positive displacement pumps to handle varying flow rates and pressures more effectively, making them suitable for applications where fluid dynamics, rather than fixed volumes, are critical. The design of the impeller blades plays a crucial role in determining how efficiently the pump can move the liquid and how well it can adapt to changes in system pressure or viscosity.

Understanding how these pumps operate is important for selecting the right pump type for specific agricultural applications, especially where variable flow rates are involved.