Section 16 MACHINERY AND MECHANICAL APPLIANCES; ELECTRICAL EQUIPMENT; PARTS THERE OF; SOUND RECORDERS AND REPRODUCERS, TELEVISION IMAGE AND SOUND RECORD ERS AND REPRODUCERS, AND PARTS AND ACCESSORIES OF SUCH ARTICLES 84 Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof 84 81 Taps, cocks, valves and similar appliances for pipes, boiler shells, tanks, vats 84 81 10 84 81 10 00 Commodity Code Description 84 81 10 00 00 - Pressure-reducing valves 84 81 20 00 00 - Valves for oleohydraulic or pneumatic transmissions 84 81 30 00 00 - Check (nonreturn) valves 84 81 40 00 00 - Safety or relief valves 84 81 90 00 00 - Parts