Reciprocating positive-displacement pumps are known as...

Reciprocating positive-displacement pumps are specifically known as piston pumps because they operate via a piston mechanism that moves back and forth within a cylinder. This action creates pressure to move fluid through the system. The design of piston pumps allows them to effectively handle varying flow rates and pressures, making them ideal for applications that require precise fluid delivery.

Piston pumps can manage high-viscosity liquids and are often used in scenarios where other types of pumps may struggle. Their ability to generate high pressure while maintaining consistent flow is a hallmark of positive-displacement technology, which distinguishes them from other types such as centrifugal pumps.

In contrast, centrifugal pumps rely on rotational energy and are not considered positive-displacement pumps, as they move fluid using a rotating impeller rather than a reciprocating motion. Air-lift pumps and pneumatic systems also operate based on different principles, utilizing air pressure or displacement rather than the piston mechanism common in piston pumps.