Liquidyne - 2-Stage Pump Seals
The Liquidyne 2-Stage is the standard design of the Liquidyne range. This seal is used in pumps that process relatively clean media that may contain abrasive particles that are no larger than 100 µm.
- Vertical sump pumps
- Self-priming centrifugal pumps
- Diffuser pumps
- Booster pumps
- Split case pumps
- Concrete volute pumps
- Vertical suspended pumps
- Fish-friendly pumps
- Predictable lifetime due to condition monitoring
- Low power consumption
- Maximized maintenance intervals
- Hard Metal Layer (HML) coating for extra durable grooved liners
- No external flush needed
- Optional design: can be designed with divisible housing parts
The Liquidyne 2-Stage design uses the process medium to lubricate, clean and cool the seal. The Liquidyne seal is made up of different modules and fulfils the following functions:
- Sealing the pump shaft
- Reducing pressure : 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 water-lubricated Liquidyne lip seals run over a partially grooved shaft sleeve placed over the pump shaft. The helical shape of the grooves and the peripheral speed (RPM) of the liner creates 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 2-Stage is available for shaft diameters from 35 to 590 millimetres.