… pipes, boiler shells, tanks, vats or the like, including pressure-reducing valves and thermostatically controlled …
Explanatory notes
… in pipes, tanks, vats or the like to regulate the flow (for supply, discharge, etc.), of fluids (liquid, viscous or … certain cases, of solids (e.g., sand). The heading includes such devices designed to regulate the pressure or the flow … ), slide valves for steam engines ( heading 84.12 ), suction or pressure valves for air or other gas compressors …