Pulsafeeder Isochem RGT IOM - Manual (Page 7)

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Standard Isochem RGT pumps are close-coupled (motor mounted directly to the rear of the
pump) which provides greater assembled strength, enclosure of moving parts, and compact
design. An optional power frame unit is available if required for motor compatibility (see
Appendix G).
All Isochem pumps transmit rotation from the motor shaft to the impeller shaft by means of a
magnetic drive coupling. An encapsulated driven magnet assembly is installed on the end of the
impeller shaft. It is surrounded by a containment can, which constitutes the rearmost part of the
pump enclosure. A drive magnet installed on the motor shaft rotates around the containment can.
Drive torque is transferred through the containment can by magnetic attraction between the drive
and driven magnet assemblies, causing the pump shaft to rotate. The containment can acts as a
fluid barrier, eliminating the need for a dynamic seal.
The magnetic coupling has an inherent characteristic that causes it to “decouple” if the coupling
torque limit is exceeded. This could happen if a piece of foreign material were to jam the pump
impeller or if unusually high torque was developed for any reason.
The magnets can operate decoupled for short periods of time without losing their magnetic
strength provided that temperature does not exceed specified limits (refer to Appendix A – Pump
Specifications).
The Isochem RGT pump is available in several different materials, and care should be taken that
all pump components (housing, wearplates, bearings) are compatible with the process liquid.
Consult with the factory for applications involving a specific gravity or viscosity greater than that
of water.