Appliances for pipes, boiler shells, tanks, vats or the like (excluding pressure-reducing valves, valves for the control of pneumatic power transmission, check “non-return” valves, safety or relief valves, taps, cocks and valves for sinks, baths and similar fixtures, central heating radiator valves, valves for pneumatic tyres and inner-tubes, process control valves, globe valves, gate valves, ball and plug valves, butterfly valves and diaphragm valves)