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)

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