8481.30.10.90 - Having a pressure rating of 850 kPa or over

This HTS category, 8481.30.10.90, specifically classifies check (nonreturn) valves constructed from copper that are designed to operate under a pressure rating of 850 kilopascals (kPa) or greater. These valves are essential components in fluid systems, allowing flow in only one direction while preventing backflow. They are employed in a wide range of industrial and commercial applications where maintaining directional flow and system integrity under significant pressure is critical.

The defining characteristic for classification under 8481.30.10.90 is its high-pressure rating. This distinguishes it from its sibling category, 8481.30.10.10, which covers identical copper check valves but with a pressure rating *under* 850 kPa. Therefore, the precise pressure threshold is the primary differentiator for correctly classifying these copper nonreturn valves at this level.

As this is a leaf node within the HTS, there are no further subcategories for this specific code. Classification terminates at this level based on the material (copper) and the pressure rating (850 kPa or over). Proper identification and documentation of the valve's tested pressure rating are crucial for accurate customs declaration under this classification.