What characteristic of positive displacement pumps is notable?

Positive displacement pumps are distinctive due to their capability to move a consistent amount of fluid with each cycle, regardless of the system pressure. This characteristic allows them to regulate and deliver a precise flow of material, making them effective for various applications where a steady flow is required.

While positive displacement pumps can handle different viscosities and fluid types, they are not exclusively designed for solid materials, which makes that choice less applicable. They can also achieve high pressures, but their primary function is not just about operating under high pressure—it’s more about maintaining a constant flow rather than adjusting volume based on pressure conditions. Moreover, while some pump designs may include features to prevent backflow, this is not a defining trait of all positive displacement pumps; backflow prevention is a separate consideration in system design. Hence, the ability to regulate the flow of any amount of material stands out as a defining characteristic of positive displacement pumps.