What is one advantage of using positive displacement pumps?

One advantage of using positive displacement pumps is their greater accuracy in delivering specific volumes of liquid. These pumps operate by trapping a fixed amount of fluid and then forcing it through the discharge pipe, which allows for precise control over the volume of fluid being pumped. This accuracy is particularly important in applications where chemical dosages need to be exact, such as in wastewater treatment processes or when handling sensitive chemicals. The ability to maintain consistent flow rates and deliver exact volumes makes positive displacement pumps particularly suitable for situations where precise chemical dosing is critical, often needing lower amounts of chemicals without sacrificing effectiveness.

In contrast, positive displacement pumps may not be the best choice for higher flow rates as they are typically more suited for moderate flows. While ease of maintenance can vary depending on the design of specific pumps, it does not universally apply to all positive displacement types. Finally, their energy consumption can be higher compared to other pumps, particularly at varying flow conditions, as they work against system pressure. Therefore, the focus on accuracy in dosing distinguishes this advantage clearly for positive displacement pumps.