8413.70.20.40 - Multi-stage, single- or double-suction

This HTS category, 8413.70.20.40, specifically classifies "Multi-stage, single- or double-suction" centrifugal pumps. These pumps are characterized by their ability to achieve higher pressures or flow rates by using multiple impellers arranged in series. The "multi-stage" designation is key, differentiating them from single-stage pumps found in sibling categories. The inclusion of "single- or double-suction" further refines the classification to pumps that draw fluid from one or two inlets, respectively, for each stage.

The primary distinction of this category lies in its multi-stage design, which implies a more complex internal construction compared to the single-stage centrifugal pumps found under categories like 8413.70.20.30 ("Single-stage, double-suction"). While sibling categories like 8413.70.20.90 ("Other") would encompass centrifugal pumps not specifically described by other subheadings within 8413.70.20, this category precisely targets pumps with the inherent operational advantage of multiple pumping stages to generate increased head or discharge.

As a leaf node, there are no further subcategories branching from 8413.70.20.40. Therefore, the classification relies solely on the physical and functional characteristics of multi-stage centrifugal pumps with either single- or double-suction capabilities. Examples of goods that would fall into this category include pumps designed for high-pressure applications in industrial processes, municipal water supply systems, or boiler feed systems, where the cumulative effect of multiple stages is essential for performance.