… Taps, cocks, valves and similar appliances for pipes, boiler shells, tanks, vats or the like, including pressure-reducing valves and thermostatically controlled valves. …
Explanatory notes
… 84.81 ‑ Taps, cocks, valves and similar appliances for pipes, boiler shells, tanks, vats … viscous or gaseous), or, in certain cases, of solids (e.g., sand). The heading includes such devices designed to … ball, plug, needle or diaphragm). They may be operated by hand (by means of a key, wheel, press button, etc.), or by a …