Metal Bellow Seal – MB-91

MB-91 seals are widely used in refining, petrochemicals and chemical industries. Static o-ring is used as a secondary member. The absence of dynamic o-ring prevents possibility of seal hang-up. Centroid loaded face design increases seal life by avoiding seal face distortion caused due to thermal expansion and also ensures optimum face flatness over a wide operating condition. As a standard, AM350 bellow cores are used. For chemical compatibility Alloy C-276 or Alloy 718 bellow cores can be used.

Seal Characteristics
  • Single Seal
  • Balanced
  • Dependent on direction of rotation
  • Metal Bellow
  • General Chemicals
  • Petrochemicals
  • Refineries
Performance Range
Shaft Diameter dl : 18…100mm
Pressure p : 20 bar (max)
Temperature t : -20…2200C
Velocity v : 20 m/sec
Seal Faces : Carbon, SiC, Tung. Carbide
Metal Parts : SS316, SS304, Hastelloy-C, Alloy 20, Carpenter 42
O-rings : Elastomers, PTFE
  A РSeal Face
B – O-ring
C – Thrust ring
D – Spring
E – Retainer
F – Grub Screw
G – Snap ring
H – Stationary Seat
I – O-ring
J – Wedge

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