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The Liquidyne 3-Stage (WA) pump seal is used in pumps that process water containing a relatively large number of abrasive particles or particles larger than 100 microns. Lagersmit developed the Liquidyne 3-Stage (WA), especially for pumps in which the pump water is polluted.


  Condition monitoring
  Low power consumption
  Maximised maintenance interval
  Hard Metal Layer (HML) coating for extra durable grooved shaft sleeves
  Settling pipe to optimise flushing medium
  Optional bronze edition to increase lifetime

This seal is mainly applied to dredging pumps, slurry pumps, booster pumps and mining pumps.



Curious about the technical specifications of the Liquidyne 3-Stage WA? Download the technical product information for drawings, cross sections and datasheets.

liquidyne-3d-1910x940 WA


The Liquidyne 3-Stage WA seals the pump and uses an external flush to lubricate, cool and clean the seal. This water flow also enables the Condition Monitoring function.
The Liquidyne seal is made up of different modules and fulfills the following functions:

  1. Sealing the pump shaft
  2. Reducing pressure
  3. Retaining dirt

The order of the modules can vary and depends on the specific application. The seal can be roughly divided into two parts:

  1. A grooved shaft sleeve that is clamped and rotates with the pump shaft;
  2. The stationary housing parts and rubber lip seals that are mounted against the pump housing.

The Liquidyne 3-Stage WA is designed for large abrasive particles (larger than 100 µm) and uses an external flush to lubricate, clean and cool the seal. The water-lubricated Liquidyne lip seals run over a partially grooved shaft sleeve placed over the pump shaft. The helical shape of the grooves and peripheral speed (RPM) of the liner create water flow (similar to aquaplaning) between the grooves and the lip seal. The water flows from the pump side to the drain of the seal. The condition of the seal is monitored by measuring the water flow from the pump side to the drain of the seal. The Liquidyne 3-Stage WA is available for shaft diameters from 35 to 590 millimetres.


The Liquidyne 3-Stage WA consists of a grooved shaft sleeve (stainless steel) with a hard metal wear layer (HML), housing parts (stainless steel), NBR lip seals and Hastelloy® C4 springs.


Low-pressure pumps can optionally use a liner with a smooth and flat surface instead of a grooved surface.


Are our standard solutions not suitable for your application? Our engineers are more than happy to develop a custom-made sealing product!



One of the main benefits of the Liquidyne is that the condition monitoring function is not just to simply monitor the condition of the seal, but it also creates a predictable lifetime. How? Over time, the grooves on the shaft sleeve gradually wear down. Less water is transported over the shaft sleeve and the amount of water leaving the drain decreases. When the drain flow is at 20% of the initial flow, maintenance needs to be planned.

By keeping track of this drain flow you can plan maintenance more efficiently, minimising the risk of sudden pump failure, optimise mean time between maintenance and reduce costs.


Do you want more information or specialist advice about the Liquidyne® 3-Stage WA seal? Contact one of our experts!

+31 (0)88 0216 200