What type of pump produces flow by capturing a volume of fluid per pump revolution?

The correct choice describes a positive displacement pump, which operates by capturing a fixed amount of fluid in a chamber during each cycle of its operation. This principle means that regardless of the system pressure, the flow rate remains consistent as it pushes the captured volume of fluid into the discharge line with each revolution or stroke.

Positive displacement pumps are widely recognized for their ability to generate a constant flow and are particularly effective at handling high-viscosity fluids. The mechanism relies on volume changes within the pump, which creates pressure that displaces the fluid. Because of this design, positive displacement pumps are ideal for applications where precise flow rates are necessary.

In contrast, other types of pumps work on different principles. For example, centrifugal pumps utilize rotational energy to generate flow, relying on the velocity of the fluid rather than capturing discrete volumes, making their performance sensitive to changes in pressure. Reciprocating pumps operate similarly to positive displacement pumps but often use a piston instead of a rotating mechanism, and while they can also move fixed volumes, they fall under a broader category. Diaphragm pumps, a subtype of positive displacement pumps, employ a flexible diaphragm to move the fluid but still adhere to the core principles of positive displacement mechanisms.

Understanding these distinctions is crucial for selecting