EagleBurgmann Single Cartridge Mechanical Seal EagleBurgmann Seal For Pumps

Mechanical seals

Mechanical seals for pumps

Standard cartridge seals

MA390 / MA391

• 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