The cooled water then recirculates to the compressor for reinjection. During rotation and throughout the meshing cycle, the timing gears maintain the correct clearances between the rotors. Since there is no contact between the rotor lobes and grooves, between the rotor lobes and casing, or between the rotor faces and end walls, no internal oil lubrication is required. This design allows the compressor to discharge oil-free air. For gear and bearing lubrication, lubricating oil from a force-feed system is supplied to each end of the compressor.
Mechanical seals serve to keep the oil isolated from the compression chamber.
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