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Couplings

MAK685
MAK685

Features
Magnetic couplings (MAK) are a hermetic sealing solution for pumps and agitators. Dangerous or precious media remain isolated in the closed system circuit.
Advantages
  • Magnetic coupling for applications acc. to API 685 (similar to API610)
  • Hermetically sealed
  • No contact of torque transmitting elements
  • No maintenance necessary
  • Hastelloy® can available
  • High efficiency can optional
  • Product-lubricated sliding bearings included
Recommended applications
  • Oil and gas industry
  • Refining technology
  • Centrifugal pumps
Item Description
1 Coupling
1.1 Inner rotor
1.2 Outer rotor
2 Can
3 Bearing assembly
3.1 Radial journal bearing
3.2 Axial journal bearing
3.3 Axial journal bearing
3.4 Shaft sleeve
4 HSH cap screw
Operating range
Pressure: p = 40 bar (580 PSI)
Temperature: t = 250 °C (482 °F) (SmCo), 120 °C (248 °F) (NdFeB)
Speed: n = 3,600 min-1
Chemical resistance: pH 0 … 14
Viscosity: 0.3 … 5,000 mPas (SiC)
Torque: 462 Nm
Solids: max. 0.1 mm; max. 5 % by weight; grain hardness max: 700 HV

Standards and approvals
  • API 685

Notes
Different variants are available to meet specific requirements:

  • High temperature variant
  • High pressure can
  • PEEK carbon fiber can

Materials
Sliding faces: Silicon carbide SiC (Q1), Carbon silicon inpregnated SiC-C-Si (Q3), Carbon graphite resin impregnated (B)
Magnets: Samarium-Cobalt (MA3), Neodymium-Iron-Boron (MA8)
Metal parts: CrNiMo steel 1.4571 (G), CrNiMo steel 1.4462 (G1), Hastelloy® C-4 2.4610 (M)
Functional description
The power transmission occurs contact-free through magnets from the drive shaft to the product wetted output shaft. Between the two rotating parts is the can wich is bolted to the container.