Liquidyne - 3-Stage Pump Vacuum Seals
The Liquidyne 3-Stage Vacuum is specially designed for vertical pumps that start up dry. The vacuum allows the pump medium to hold a water column up to eight metres when the pump is at a standstill.
The vacuum module also prevents air leakage through the seal into the pump if the pressure inside the pump is lower than atmospheric pressure. The Liquidyne seal is made up of different modules and fulfils the following functions:
The Liquidyne seal is made up of different modules and fulfils the following functions:
- Sealing the pump shaft
- Reducing pressure
- Holding a vacuum
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 Vacuum can be lubricated, cleaned and cooled with the pump medium if it doesn’t contain too many (up to 100 µm) abrasive particles. 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 Vacuum is available for shaft diameters from 35 to 510 millimetres.
- Suitable for dry start-up of the pump
- Retains pump medium up to eight metres
- Predictable lifetime due to condition monitoring
- Low power consumption
- Maximised 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.