Rubber Bellow Seal – RBS-21

RBS-21 is unbalanced single acting helical coil spring seals independent o1 direction of rotation. The drive ring’s notch design eliminates over stressing of the elastomer bellows. Slippages are eliminated, protecting the shaft and sleeve from fretting. Seal can be repaired in field with minimum spares, minimizing the downtime cost.

Seal Characteristics
  • Single Seal
  • Unbalanced
  • Independent of directions of rotation
  • Conical spring
  • Water pumps
  • Oil pumps
  • Slurry pumps
  • Compressors
  • Blowers
Performance Range
Shaft Diameter dl : 10…100mm
Pressure p : 22 bar (max)
Temperature t : -20…1400C
Velocity v : 15 m/sec
Seal Faces : Carbon, Ceramic, SiC,

Tung. Carbide

Metal Parts : SS304, SS316
Bellows : Nitrile, Viton
  A – Seal 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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