... ,Diaphragm,MAJOR REPAIR KIT OF SCREW ROTOR,ROTOR INSTALLATION KIT,MAJOR REPAIR KIT OF GEARBOX and so on ... . Unloading, loading, gas supply, to prevent infiltration of outside debris, 100% gas Supply.2, Oil stop valve ... of the main functions: to prevent oil back turning ... the unit run-time to ensure the normal operation of a rotor; Prevents the oil leak, if the rotor ...