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AODD Pumps

Conquering the Challenges of Latex Emulsion–Handling

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Over the years, the search for the perfect pump type to handle latex emulsions has led manufacturers to experiment with a number of different technologies, most of which feature operational ‘blind spots’ that negatively affect their performance in latexhandling applications. Among these competitive technologies, and their respective operational drawbacks, are:

  • Gear pumps: Not recommended for shearsensitive fluids; if used, must be oversized and operate at very low speeds; seals are prone to leakage; pressure relief valve required on discharge side of pump
  • Centrifugal pumps: Not recommended for, but known to be used with thin emulsions; seals must have a flush pan and/or be cooled to prevent product buildup around the pump shaft; double mechanical seal or water seal with packing gland is required; low-flow operation can cause pump failure; may require priming
  • Progressive cavity/rotary screw pumps: Expensive to maintain; hard to disassemble; pressure relief valve required on discharge side of pump; viscous materials require oversized pump operating at low speed; tight internal clearances; cannot be run dry, seals prone to leakage
  • Circumferential piston pumps: Not recommended for shear-sensitive fluids; multiple seals are prone to leakage
  • Peristaltic (hose) pumps: Only suitable for low-flow applications

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