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Common metals and their alloys; building materials of metal; transportable buildings of metal; materials of metal for railway tracks; non-electric cables and wires of common metal; metal ironmongery and locksmithing articles; pipes of metal; safes; goods of common metal not included in other classes; ores; spherical plug valves and metal turning valves; flow-control valves, check valves and dirt traps of metal for pipe conduits. Special valves as machine parts, namely spherical plug valves and turn valves of metal or of synthetic materials (including those operated electrically and pneumatically as well as those with heat jackets) with flow-control valves; all the aforesaid products with interior lining of synthetic materials resistant to corrosion. Special valves intended for conduit installations for the chemical and petrochemical industry, namely spherical plug valves and turn valves made of metal or of synthetic materials (including those operated electrically and pneumatically as well as those equipped with heat jackets) with flow-control valves; check valves and dirt traps for use with abovementioned conduits; all the aforesaid products with interior lining of synthetic materials resistant to corrosion; warning lamps for the aforesaid products. Sealing gaskets made of polytetrafluoroethylene for use on special valves intended for conduit installations for the chemical and petrochemical industry.