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Magnetic
Drive Gear Pump Prinicples
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 Magnetic
Coupling
Consists of two magnets, a drive magnet that attaches to the motor
shaft and a driven magnet that is completely sealed within the
pumphead and is connected to the driving gear. The driven magnet
is a wetted component and is totally encapsulated. The two magnets
couple automatically such that the drive magnet turns the driven
magnet and gears without physical contact.
Decoupling occurs when the pump load exceeds the coupling torque
between the two magnets. This feature can act as a safety device
to prevent damage to the pump and motor as well as associated
piping. The magnets can be recoupled by bringing the motor to
a complete stop, then eliminating the cause of the decoupling
and restarting.
Conventional
Mechanical Sealing
 Many
pumps utilize a dynamic seal on the pump shaft. These types of
seals, either mechanical seal or packed glands, rely on the control
of fine clearances to minimize pump leakage. However, these seals
require cooling and lubrication across the seal face. This cooling
is often provided by a controlled leak of the process fluid, resulting
in environmental contamination or contamination of the process
fluid.
Dynamic seals also convert friction to heat. This increased heat
can transfer to the liquid and cause vaporizing (cavitation) within
the pump requiring larger motors, increased power consumption,
and shorter life.
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