Item Description
1.1 Seat
1.2, 2.3, 3.2 Retainer
2.2, 3.1 Seal face
2.4 Bellows
2.5 Adapter
4 O-ring
5 Spring
2.6, 6 Housing
2.7 Damper
7 Retaining ring
8 Sleeve
9 Spacer
A Oil IN
C Drain



  • Oil-lubricated
  • Double seal
  • Balanced
  • Bi-directional
  • Stationary bellows (process side)
  • Multiple springs (bearing side)
  • Shrink-fit seat
  • Double-pressure balanced


  • Suitable for high sliding velocities
  • Seal does not open if oil pressure drops
  • Rugged seat with bandage ensures reliable operation
  • Compact design with few sealing components

Operating range

Shaft diameter: d = … 220 mm (8.66")
Pressure: (p2-p1) = … 5 bar (73 PSI)
Sliding velocity: vg = 90 m/s (295 ft/s)


Bellows: AM350, Inconel® 718, Hastelloy®-C
Seal face: Special SiC, high-density carbon graphite
Seat: Silicon carbide
Secondary seals: FKM (bearing side)
Metal parts: 1.4301, Carpenter® 42, Inconel® 718, Hastelloy®-C


This special shaft seal is characterized by its straightforward structure, compact length and quiet running even under changing pressure conditions. It also seals reliably at both high and low temperatures.

Dimensions on request.

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