Item Description
1 Seal ring with bellows unit
2, 8, 10 Graphite ring
3 Collar
4 Spring washer
5 HSH Cap screw
6, 14 Set screw
7 Mating ring
9 Seal sleeve
11 Drive collar
12 Pin
13 Clamping sleeve
15, 20 Hexagon bolt
16 Gland plate
17 Gasket
18 Throttle bushing
19 Setting device
21 Baffle sleeve
22, 23 Retaining ring


F Flush
Q Quench
D Drain

MBS682

Features

  • API 682 Category 2 and 3, Type C, Arrangement 1 seal
  • Single seal
  • Balanced
  • Cartridge unit
  • Rotating metal bellows
  • Shrink fitted seal ring and solid mating ring

Advantages

  • Compact design
  • Suited for applications with extreme high and low temperatures
  • Absence of dynamic O-Ring eleminates/reduces seal face hang-up
  • Bellows design minimizes variation in face load due to shaft expansion or face wear
  • Resistant to abrasive particles in the medium, no shaft or sleeve fretting
  • Also available in double ply design

Operating range

Shaft diameter: d1 = 20 ... 110 mm (0.79" ... 4.33")
Pressure single ply bellows: p = vacuum ... 25 bar (... 363 PSI)*
Pressure double ply bellows: p = vacuum ... 35 bar (... 508 PSI)
Temperature: t = -75 °C ... +400 °C (-103 °F ... +752 °F)
Sliding velocity: vg ... 23 m/s (... 75 ft/s)


* p >20 bar (290 PSI) on request.

Materials

Seal ring: Blister resistant carbon,
Silicon carbide SSiC (Q1), RBSiC (Q2)
Mating ring:
Silicon carbide SSiC (Q1), RBSiC (Q2)
Bellows: Inconel® 718 (M6)
Secondary seals: Graphite (G)
Metal parts: CrNiMo steel 316 (G),
Carpenter® 42 (T4)

Standards and approvals

  • API 682 / ISO 21049
  • API 682 4th ed. Cat. 2/3 - 1CW-FL



Product variants