Sealless Mag Drive

A sealless mag drive pump is comprised of two independent shafts. One shaft connects to the drive equipment (motor, reducer, etc.) and the second shaft connects to the pumping elements (rotor, gears, etc.). A magnetic coupling transmits the rotation of the drive shaft to the driven shaft inside the pump.

Sealless mag drive pumps can be any number of pump technologies including internal gear, external gear, vane, centrifugal and others.

Click here to view a video about how internal gear mag drive pumps work.

At the core of sealless mag drive pumps is the magnetic coupling. 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.