Dynamically Sealed Pump Overview

When working with customers we like to focus on pumping solutions that are a bit out of the norm for a lot of people. One of the pump brands we represent in the State of Tennessee is WILFLEY. This is a company that started as a slurry pump manufacturer that morphed into one of the most unique and versatile chemical pumps in our arsenal. The beauty of the Wilfley Dynamically Sealed Pump is that, when running, there are no seal faces to generate heat or to wear out. This is achieved from the use of an expeller and an actuation plate that operates via centrifugal force and pushes the seal faces apart from one another. Rather than me keep on rambling, just watch the video below and you will get a better idea of how this pump operates:

Over the years the design of this seal has had a fairly dramatic evolution with the large part of the improvements coming in the past 3 years. We have had success in:

  • Sulfuric Acid
  • Ammonium Nitrate
  • 50% Sodium Hydroxide
  • Nitric Acid
  • Phosphoric Acid
  • Molten Sulphur
  • and more……

So, you may ask why use this seal over a conventional mechanical seal. Well, we start to look seriously as the Dynamic Seal is situations where:

  • Fluid is sensitive to heat (explosive)
  • Double mechanically sealed pumps are not acceptable
  • Pumps tend to be run dry or see excessive cavitation

Oh yeah, I guess I could have mentioned that earlier! These pumps can be run dry and handle cavitation well due to the fact that while running the seal faces are not touching and therefore do not create heat that destroys typical seals. Cavitation will affect the flow, but no worries with the seal faces.

The intention of this post is not to get into the finer details of the pump and how it operates, but rather to give you, the reader, an introduction to the technology and something to consider when new projects or problems arise. I hope this has been a helpful overview for you and if you wish to learn more just visit:


and if you would like a quote or to discuss an application, you can visit us at:

www.haglerllc.com or call 423.265.2281

Thomas Hagler About Thomas Hagler