6
Metal building materials; pipes and tubes of metal; fittings made of metal for pipes and tubes; valves of metal (other than parts of machines); control valves; check valves; safety valves; stop valves; pressure reducing valves; regulating valves; fluid valves; flow isolating valves; water pipe valves; valve assemblies; coupling connectors, joints, junctions, supports, clamps, adaptors
7
Machines and machine tools; motors and engines (except for land vehicles); machines coupling and transmission components (except for land vehicles); valves (being parts of machines); check valves; control valves; fluid flow control valves; fluid pressure flow control valves; temperature control valves; vacuum control valves; pneumatic control valves; fluid valves; back flow prevention valves; reduced pressure zone valves; safety valves; water safety valves; electric valves; hydraulic valves; power operated valves; pressure reducing valves; valves operated automatically by changes in physical conditions; valves operated automatically by changes in pressure; valve actuators; pneumatically operated valve actuators; hydraulic pumps
9
Measuring and regulating apparatus and instruments; apparatus and instruments for monitoring and/or controlling the flow of gas and/or liquid in pipelines; detecting instruments and equipment; testing instruments and equipment; pressure supervision apparatus; pressure gauges; pressure sensors; valves (being electrical or otherwise power operated)
11
Apparatus for heating, steam generating, drying, cooling, ventilating and water supply; regulatory and safety apparatus for water and gas apparatus; regulating and safety systems for use on water and gas supply installations, apparatus and pipes; safety valves, stop valves, regulating valves pressure relief valves, pressure and temperature relief valves and temperature control valves, all for water and gas supply installations, apparatus and pipes