Oil Pumps
Tark, formerly North Co., developed the first hermetically sealed direct-drive centrifugal pumps (HDD's) for x-ray tube cooling.  HDD's have the following unique characteristics:
DD5
HDD10
HDD30
HDD40

      .
HDD60
HDD62
HDD80
 
 
 
No shaft seals, gaskets or o-rings
Housings are completely welded.  Motor actually runs in the coolant.  This both cools it and ensures completely leak-free operation.
Ideal for clean system applications in which air, moisture, or contaminants cannot be tolerated
Much quieter and longer life than gear pumps
High flow, lower pressure
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