Pumps termed as sealless, seal-free or leak-free (the terms are generally interchangeable) became a realistic option for operators in chemical processing applications more than 30 years ago. The first iteration had one main job: perform better at preventing the leakage of hazardous materials than sealed pumps through a sealless design.
This latest article "How Sealless Sliding Vane Pumps Work in Chemical Transfer" written by Geoff Vanleeuwen, Product Management Director for Blackmer, can be found in Pumps & Systems.
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