... . Widely used in mining, construction, machinery, chemical industry, metallurgy, transportation and air separation, instrument control, medicine ... 414M8-68/20structure typeZMDMcompressed mediumOxygenOxygenNitrogenNitrogencooling stylewater coolinglube style for cylinderoil freeoil freeoiloil freeNo. of row3424No. of ... speed (r/min)713333428300Remarks Oxygen compressor for chemical industry ZW-TYPE