Liquidyne® 3-Stage WA

LIQUIDYNE® 3-STAGE WA

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.

Advantages

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.

HOW IT WORKS

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:

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 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.

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 WA

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