Positive displacement pumps are primarily used for what purpose?

Positive displacement pumps are primarily used for chemical dosing due to their ability to deliver a precise amount of fluid at a consistent flow rate, regardless of the pressure in the system. This characteristic is essential for applications where accurate measurement and delivery of chemicals are critical, such as in water treatment processes.

These pumps operate by trapping a fixed amount of liquid in a chamber and then forcing that liquid out into the system, which allows them to handle varying fluid viscosities and maintain stable flow rates. This precision makes them ideal for injecting chemicals into water supplies, ensuring that the correct concentrations are achieved for effective treatment without fluctuations that could arise from other types of pumps.

While they can be employed in other applications, such as filling tanks or groundwater extraction, the unique qualities of positive displacement pumps align most closely with the demanding requirements of chemical dosing, where accuracy and reliability are imperative.