Section 16 MACHINERY AND MECHANICAL APPLIANCES; ELECTRICAL EQUIPMENT; PARTS THEREOF; SOUND RECORDERS AND REPRODUCERS, TELEVISION IMAGE AND SOUND RECORDERS AND REPRODUCERS AND PARTS AND ACCESSORIES OF SUCH ARTICLES 84 NUCLEAR REACTORS, BOILERS, MACHINERY AND MECHANICAL APPLIANCES; PARTS THEREOF 84 81 THERMOSTATICALLY CONTROLLED VALVES. Commodity Code Description 84 81 10 PRESSURE-REDUCING VALVES 84 81 20 VALVES FOR OLEOHYDRAULIC OR PNEUMATIC TRANSMISSIONS 84 81 30 CHECK (NONRETURN) VALVES 84 81 40 SAFETY OR RELIEF VALVES 84 81 80 OTHER APPLIANCES (TAPS/COCKS/OTH.VALVES & SIM. APPLIANCES FOR PIPES...) 84 81 90 PARTS OF TAPS/COCKS/VALVES & SIM. APPLIANCES FOR PIPES, BOILER SHELLS,...