... of compressor:Model No.: WWS-4.5/0.1-150Type: W type, 4-stage compression, 4 rows, water cooling;Meida: ... Lubrication mode: Oil free in cylinder and packing assembly, oil lub.Through oil pump for connecting rod and crackshaft;Lub.oil pressure: 0.20 ... solenoid, site instrument panel, system pressure converter, electric motor and etc. . Nitrogen Compressor For Chemical Plant And Electric Power Station