7 Reciprocating compressors; machines, machine parts, apparatus being machines or machine parts, fittings being machines and machine parts and machine-operated devices for the generation, processing, compression, monitoring, treatment, ducting and distribution of compressed gases for use in petrochemical or chemical installations, in oil and gas transport installations, in oil and gas conveying installations, in oil and gas storage installations, gas-water separation and injection installations, in installations for generating liquefied natural gas, in gas separation installations and in synthesis gas installations, in installations for fueling up gas-driven vehicles, and in power plant installations; machines, machine parts, apparatus being machines or machine parts, fittings being machines and machine parts and mechanically operated equipment for controlling, regulating and monitoring pressurized installations and equipment in petrochemical or chemical installations, in oil and gas transport installations, in oil and gas conveying installations, in oil and gas storage installations, gas-water separation and injection installations, in installations for generating liquefied natural gas, in gas separation installations and in synthesis gas installations, in installations for fueling up gas-driven vehicles, and in power plant installations; units being machine parts, consisting of motors, pressure control systems, volume flow control systems, suction and discharge valves; pressure relief valves being machine parts; pressure equalizing valves being machine parts; control valves being machine parts; pilot valves being machine parts; non-return valves being machine parts; shutoff valves being machine parts; overload protection valves being machine parts; safety valves being machine parts; regulating valves being machine parts; reducing valves being machine parts; throttle valves being machine parts; filters being parts of machines for use in oil and gas industry; condensate separator being machine parts; sealing rings, piston rod seals and scraper rings as parts of piston compressors