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Compact Cartridge Seal

  • Cartridge
  • Balanced
  • Independent of direction of rotation
  • Stationary multiple springs
  • Springs and pin located on the atmospheric side

Product specification example

Standards and approvals

EN 12756
ISO 3096


Seal face (MA290, MA390): High density carbon graphite
Seal face (MA291, MA391): Silicon carbide(Q1)
Seat (MA290/291, MA390/391): Silicon carbide (Q1)
Metal parts: CrNiMo steel 316(G)
Secondary seals: FKM (V)

Operating range

MA290 / MA390:
Pressure: p = … 20 bar (290 PSI)
Temperature: t = -20 °C …160 °C (-4 °F … 320 °F) (oil), 0 °C … 60 °C (32 °F … 140 °F) (water)
Sliding velocity: vg = max. 20 m/s (66 ft/s)
Viscosity: 0.5 Pa·s
Solids content: 0.3wt. %
MA291 / MA391:
Pressure: p = … 16 bar (232 PSI)
Temperature: t = -20 °C …160 °C (-4 °F … 320 °F)(oil), 0 °C … 60 °C (32 °F … 140 °F) (water)
Sliding velocity: vg = max. 20 m/s (66 ft/s)
Viscosity: 3 Pa·s
Solids content: 10wt. %

Recommended applications

Water and waste water technology
Chemical industry
Petrochemical industry
Pharmaceutical industry
Food and beverage industry
Universally applicable
Centrifugal pumps
Eccentric screw pumps
Process pumps

Applicable ranges shown in the product introduction are limit values for each standard material.
Applicable ranges, performance data and figures can serve only as a guide for selection and therefore in actual use there will be some cases where general specifications cannot be applied due to unknown factors or constraints.
Please check the applicability before use.
The contents are subject to change without notice for improvement.


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