How it Works: Magnet Driven (MagDrive) Pump

#VikingPump #MagDrive #MagneticCoupling

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On the earliest pump designs, the rotating shafts were sealed with compressed shaft packing - limiting the rate of leakage but failing to completely contain the liquid within the pump.

While there have been many advancements in dynamic seal technology, magnet driven - or mag drive - pumps offer a SEALLESS alternative.

At the core of a mag drive pump is the magnetic coupling.

Here, there are two assemblies that contain an equal number of magnets with alternating poles.

The first, inner magnet assembly, connects directly to the pump shaft…

while the second, outer magnet assembly is driven by the motor.

The attraction of opposing polarity magnets align the inner and outer magnet assemblies, which in turn enables the rotating outer magnet to transmit its rotation to the inner magnet and pump shaft assembly.

This then rotates the pump internals, creating flow.

A containment shell - called a canister - fits around the inner magnet, keeping the liquid inside the pump without the use of a dynamic seal.

Sealless mag drive pumps offer the highest level of liquid containment and are favored in applications that are difficult to seal, pose environmental or health risks, or where the longest possible seal life is desired.