What defines a positive displacement pump?

A positive displacement pump is characterized by its ability to move a specific volume of fluid with each cycle or stroke. This means that regardless of the resistance or pressure against the fluid, the pump consistently delivers the same amount of liquid every time it completes a cycle. This design makes positive displacement pumps particularly effective for applications where precise flow rates are essential.

The continuous operation of a pump, while a characteristic of many types, does not specifically define positive displacement pumps, as they can operate intermittently depending on the system requirements. While many positive displacement pumps are capable of generating high pressure, this is not an exclusive feature that defines them. Other pump types can also achieve high pressures. Additionally, while positive displacement pumps can be used for various fluids, including water, they are not limited to water alone; they can handle a wide range of liquids with varying viscosity and properties.