281411 Pressure-reducing, control, check and safety valves

28141120 Pressure-reducing valves of cast iron or steel, for pipes, boiler shells, tanks, vats and the like (excluding those combined with lubricators or filters) 28141140 Pressure-reducing valves for pipes, boiler shells, tanks, vats and the like (excluding of cast iron or steel, those combined with filters or lubricators) 28141160 Check valves for pipes, boiler shells, tanks, vats and the like 28141170 Valves for pneumatic tyres and inner-tubes 28141180 Safety or relief valves for pipes, boiler shells, tanks, vats and the like