MA290 / MA291

MA290 / MA291
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

MA290 / MA291

Features

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

Advantages

  • Extremely short length design -
    the total length including the seal cover is less than 50 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

Operating range

MA290:
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 %

MA291:
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 %

Materials

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

Standards and approvals

  • EN 12756
  • ISO 3096

Similar products

MA250 / MA251

  • Cartridge design
  • Balanced
  • Independent of direction of rotation
  • Stationary, inside mounted type
  • Springs do not contact the liquid

MA390 / MA391

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

MD251

  • Cartridge design
  • Balanced
  • Double seal
  • Independent of direction of rotation
  • Springs do not contact the liquid
  • Inboard seal can withstand both forward and back pressure
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