All you need to know about the Liquidyne®

The Liquidyne is based on water lubricated lip seal technology. This seal type is applicable on several rotary pumps, such as dredge pumps, cooling-water pumps, booster pumps, slurry pumps and many more applications.

About the Liquidyne

The Liquidyne shaft seal may consist of four types of modules, fulfilling (1) a sealing, (2) a pressure reducing, (3) a dirt retaining and (4) a vacuum function. The order of the modules can vary and depends on the specification of your application. The picture underneath shows a Liquidyne used in pumps that process water containing a relatively large number of abrasive particles (lager than 100 micron).

How it works

The water lubricated lip seals run over a partially grooved bush placed over the pump shaft. The helical shape of the grooves and the peripheral velocity of the bush create water flow between the grooves and the lip seal. This flow and lubricant film is comparable to aquaplaning. The water constantly flows away from the high pressure side to the drain side of the seal where the pressure is lower. The Liquidyne uses water to lubricate, flush and cool the seal. If the pump water doesn’t contain large abrasive parts, the seal can be lubricated with the pump medium. If the pump water holds relatively large abrasive parts an external water system is used.

Condition Monitoring

Over time, the grooves on the bush gradually wear down. Less water is transported over the bush and the amount of water leaving the drain decreases. When the drain flow is at 20% of the initial flow, maintenance is required. By plotting this decrease in drain flow, you can plan maintenance more efficiently and optimize Mean Time Between Maintenance. This is called Conditioning Monitoring. This prevents sudden pump failure and reduces costs.

The picture above shows how you can follow the decrease and how the desirable maintenance can be planned.

The Condition Monitoring benefit results in the following advantages:

  • Predicts remaining seal
  • Optimises maintenance intervals
  • Prevents sudden pump failure
  • Low Cost of Ownership

Curious to learn more about Condition Monitoring? Read our blog ‘How to (and why): Conditioning Monitoring at the Liquidyne‘.

Want to know which Liquidyne seal meets your application? This product sheet contains a complete overview of the different Liquidyne types.

Interested in more information?

Would you like to receive more information about our Liquidyne seals? Do not hesitate to contact our Liquidyne experts!

Eric de Paauw

Eric de Paauw

Jan Willem Bongers

Jan Willem Bongers