The key classification factors are: (1) actuation method — hand-operated, check (non-return), or actuated; (2) the fluid or gas the valve is designed to control; (3) pressure rating and body material; and (4) whether the valve is a complete assembly or a part. These distinctions separate valves across multiple HTS subheadings in Chapter 84, each potentially carrying a different duty rate and trade remedy status.

Yes, antidumping orders have been issued on certain valve types — including cast iron pipe fittings and specific steel valve categories — from particular countries. Importers should verify current order coverage by checking the Commerce Department's active order list against the specific HTS subheading and country of origin for their product before finalizing sourcing decisions.