Liquidyne® 3-Stage

LIQUIDYNE® 3-STAGE

The Liquidyne 3-Stage is specially developed for dredging pumps that process a polluted medium with abrasive media particles that are larger than 100 µm. The Liquidyne seals the pump shaft and uses an external flush to lubricate, cool, and clean the seal, while the drain flow enables condition monitoring.

Applications

Vertical sump pumps
Slurry pumps
Self-priming centrifugal pumps
Diffuser pumps
Booster pumps
Split case pumps
Concrete volute pumps
Sewage pumps
Vertical suspended pumps
Axial pumps
Fish-friendly pumps

Advantages

Robust seal design
Dirt retaining module
Predictable lifetime due to condition monitoring
Low power consumption
Maximized maintenance intervals
Hard Metal Layer (HML) coating for extra durable grooved liners
Optional design: can be designed with divisible housing parts

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

HOW IT WORKS

The Liquidyne seal is made up of different modules and fulfils the following functions:

Sealing the pump shaft
Reducing pressure
Retaining dirt

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

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

The Liquidyne 3-Stage 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 is available for shaft diameters from 35 to 590 millimetres.

PREDICTABLE LIFETIME

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.

LIQUIDYNE® 3-STAGE

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