MA390 / MA391

MA390 / MA391 For a larger view, please mouseover the image.
For a larger view, please mouseover the image.
Item Description
1 Seal face
2, 5, 7 O-Ring
3 Spring
4 Seat
6 Drive collar
8 Set screw
9 Seal cover
10 Gasket
11 Assembly fixture
12 HSH cap screw
  • Cartridge
  • Balanced
  • Independent of direction of rotation
  • Stationary multiple springs
  • Springs and pin located on the atmospheric side
  • Ultra-thin compact design -
    the total length including the seal cover is only 33 mm
  • Easy installing on the pumps without modifying the stuffing box
  • Excellent followability due to no influence from run-out, squareness or vibration of the shaft
  • Mounted outside the stuffing box for providing excellent air cooling performance
  • Un-wetted springs and knock pins for protecting from lockout by liquid
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: 0.3 %

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: 10 %
Seal face (MA390): High density carbon graphite
Seal face (MA391): Silicon carbide (Q1)
Seat (MA390/391): Silicon carbide (Q1)
Metal parts: CrNiMo steel (G)
Secondary seals: FKM (V)
  • EN 12756
  • ISO 3096
  • Petrochemical industry
  • Chemical industry
  • Pharmaceutical industry
  • Pulp and paper industry
  • Water and waste water technology
  • Food and beverage industry
  • Universally applicable
  • Centrifugal pumps
  • Eccentric screw pumps
  • Process pumps