MA390 / MA391 Burgmann mechanical seal

MA390 / MA391

Features

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

Advantages

  • 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

Operating range

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)
Seal 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 %

MA390 / MA391 Materials

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)

Standards and approvals

  • EN 12756
  • ISO 3096

 

Download catalog for more information:MA390 MA391