1Seal face, atmosphere side
2Seal face, product side
6, 7, 13, 14, 15O-Ring
11Seat, product side
12Seat, atmosphere side



  • Liquid-lubricated double seal for top-entry drives
  • Cartridge unit
  • Self-closing on the product side
  • For stepped and unstepped shafts
  • Unbalanced
  • Independent of direction of rotation
  • Multiple springs rotating


  • Ready-to-fit and factory-tested units
  • The M481K and its variants will remain closed even during pressure variations or pressure reversal. Operation is possible with buffer fluid (p1max = 6 bar (87 PSI)) or pressurized with barrier fluid as double seal
  • Available with or without bearing
  • Suitable for standardizations
  • Seal can be applied at higher pressure and rotating speed than specified by DIN

Operating range

Shaft diameter:
d1 = 40 ... 220 mm (1.57" .... 8.66")

p1 = vacuum ... 16 bar (232 PSI),

p3 = max. 18 bar (261 PSI)
t1 = -40 °C ... +200 (350*) °C
(-40 °F ... +392 (662*) °F)

Sliding velocity:
vg = 0 ... 5 m/s (0 ... 16 ft/s)

For applications beyond this range, please inquire.

* with cooling flange

! It should be noted that the extremal values of each operating parameter cannot be applied at the same time because of their interaction.


Seal faces: Carbon graphite or Silicon carbide, FDA conform
Seats: Silicon carbide, FDA conform
Secondary seals and metallic parts acc. to application and customers' requirement.

Standards and approvals

  • FDA
  • ATEX
  • DIN 28138 (mechanical seals for agitator shafts)
  • DIN 28136 T2 (for steel vessels)
  • DIN 28141 (flange connection for steel vessels)
  • DIN 28154 (shaft end for steel vessels)


  • Cooling resp. heating flange
  • Leakage drain
  • Flush
  • Polymerization barrier
  • Axial expansion joint (shaft movement)
  • Wiper ring (shaft movement)

Please inquire.

Recommended piping plans

Closed circuit EagleBurgmann TS system, open circuit EagleBurgmann SPA, SPN

Product links:
EagleBurgmann TS1000
EagleBurgmann TS2000
EagleBurgmann SPA
EagleBurgmann SPN manual
EagleBurgmann SPN automatic

Product variants

Variant with integrated floating bearing

Variant for unstepped shafts or customer-specific connection dimensions. The seal is available for any diameter. Further customer-specific adaptations are also possible.