Positive Pressure Oil Lubrication:
These pumps have a well-proven, positive pressure oil lubrication system developed by Edwards to ensure correct lubrication in all operating modes, particularly under high gas loads where oil starvation is a common problem with other pumps.
- Integral oil pump ensures an adequate oil flow through the stator/rotor assembly at all times
- Only clean degassed oil is supplied to the high vacuum stage on two-stage pumps
- System is much less dependent on correct oil levels in the reservoir than other pump designs
- Pumps can operate with oil levels as low as 50–70% of the maximum fill level (not recommended)