Item Part no.
DIN 24250
Description
1.1 472/481 Seal face with bellows unit
1.2 412.1 O-Ring
1.3 904 Set screw
2 475 Seat (G9)
3 412.2 O-Ring

MFL85N

Features

  • For unstepped shafts
  • Single seal
  • Balanced
  • Independent of direction of rotation
  • Metal bellows rotating

Advantages

  • For extreme temperature ranges
  • No dynamically loaded O-Ring
  • Self cleaning effect
  • Short installation length possible
  • Pumping screw for highly viscous media available (dependent on direction of rotation).

Operating range

Shaft diameter:
d1 = 16 … 100 mm (0.63" … 4“)
Externally pressurized:
p1 = … 25 bar (363 PSI)
Internally pressurized:
p1 <120 °C (248 °F) 10 bar (145 PSI)
p1 <220 °C (428 °F) 5 bar (72 PSI)
Temperature: t = -40 °C … +220 °C
(-40 °F … 428) °F,
Stationary seat lock necessary.
Sliding velocity: vg = 20 m/s (66 ft/s)

Materials

Seal face: Carbon graphite antimony impregnated (A), Silicon carbide (Q12)
Seat: Silicon carbide (Q1)
Bellows:
Inconel® 718 hardened (M6), Hastelloy® C-276 (M5)
Metal parts: CrNiMo steel (G), Duplex (G1), Hastelloy® C-4 (M)

Standards and approvals

  • EN 12756



Product variants

MFL90N
Shaft diameter:
d1 = 20 … 100 mm (0.79" … 4“)
Internally pressurized:
p1 = … 16 bar (232 PSI),
stationary seat lock necessary.
Externally pressurized:
p1 = 10 bar (145 PSI)
Temperature:
t = -40 °C … +220 °C (-40 °F … +428 °F)
Sliding velocity: vg = 20 m/s (66 ft/s)
MFL85P / MFL90P
Version with pumping ring. Dependent on direction of rotation. Can be retrofitted.
MFL85F
Dimensions, items and description as for MFL85N, but with pumping screw (item no. 1.4). Dependent on direction of rotation. The pumping screw can be retrofitted.