Automatic purge control offers the ultimate vacuum pump protection against moisture build-up in the oil. Priming applications can frequently have water build-up problems simply due to the inherent presence of moisture within the priming air. With purge control maintenance requirements and frequency of oil changes are greatly reduced, helping to maintain the vacuum pump in peak performance. 
 

The basic components of the Purge Control feature include electric or pneumatic controlled vacuum pump isolation valves , purge solenoids and control sequencing. Above figure and picture at the right show incorporation of components into a typical duplex system.

Purge control is initiated at the end of each vacuum pump run cycle. Before shutting down, the vacuum pump is isolated off the system. The vacuum pump then runs for a set period of time purging air through the purge solenoid. Isolation valves remain closed until a vacuum pump is called to start.

This feature provides an added measure of safety keeping the vacuum pumps isolated from flooding should a failure in the process force water back into the vacuum receiver. While this certainly isn’t a routine occurrence, it can happen from a number of causes.
 

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