Industrial seals

Get one step closer to Industry 4.0 with the Liquidyne® 3-Stage

A pump shaft seal that is the next step towards Industry 4.0? Find out more about the Liquidyne 3-Stage! Read this blog to find out more about the advantages, the working principles and how Lagersmit can deliver you Peace of Mind.


  • The Liquidyne 3-Stage is the upgrade for a gland packing and the alternative for mechanical seals;
  • The seal uses an external flush to lubricate, cool and clean the seal;
  • With the Condition Monitoring function the seal can be measured from a distance;
  • The lifetime of the seal is predictable and sudden pump failure can be avoided;
  • The seal can deal with a pump pressure up to 40 bar.

About the Liquidyne 3-Stage

The Liquidyne 3-Stage pump shaft seal is water lubricated and has a robust design. This makes the seal resistant against rough circumstances. Due to the Condition Monitoring function the lifetime can be predicted and sudden pump failure can be avoided. The seal is used in pumps that process water containing abrasive particles larger than 100 micron and is suited for a pump pressure up to 40 bar.

How does Lagersmit get your plant one step closer to Industry 4.0?

Industry 4.0 or Smart Industry enables companies to monitor their production and to produce more efficient. The Condition Monitoring function of the Liquidyne 3-Stage is the element that brings you one step closer to this. The maintenance interval can be predicted and due to this sudden pump failure can be avoided. This – together with the low energy consumption of the seal – results in saving costs.

More info about Condition Monitoring of the seal? Read our blog about this topic!


  • Condition Monitoring
  • Maximised maintenance interval
  • Low energy consumption
  • Low cost of ownership
  • Robustness (operation hours, quality and reliability)
  • Less dependent of radial and axial vibrations during operation

Looking for exact details of the Liquidyne 3-Stage? The information folder contains all specifics of this seal.

How it works

The seal can be roughly divided into two functional parts. A grooved bus is pushed over the shaft so that the shaft does not wear out. This section is fitted on the shaft and rotates with the shaft. The package of the housing parts and lip seals is mounted on the pump housing and is stationary.

Video Liquidyne 3-stage WA

The Liquidyne uses water to lubricate, flush and cool the seal. The seal can be lubricated by the pump medium, if the size of the abrasive particles is less than 100 micro meters. If the size of the abrasive parts in the pump medium is larger, an external flush is needed. The lip seals run over a partially grooved bush placed over the pump shaft. This bush is coated with a hard metal layer (HML) to maximize the life of the bush. The helical shape of the grooves and the peripheral velocity of the bush create water film between the grooves and the lip seal. Through this film water is transported under the rubber lip seal from the high pressure side wet side to the atmospheric dry side of the seal.

The Liquidyne 3-Stage is, for instance, applicable on the following pump types:

  • Booster pumps
  • Sewage pumps
  • Mining pumps
  • Slurry pumps
  • Jet pumps
  • Process pumps

Interested in more information?

Contact our seal expert!