Item Description
1, 14 Seal ring with bellows unit
2, 8, 15, 21, 25 Graphite ring
3 Collar
4, 17 Spring washer
5, 18, 23 HSH Cap screw
6, 19, 29 Set screw
7, 20 Mating ring
9 Clamp sleeve
11, 22 Gland plate
12 Gasket
16 Pumping ring
24 Seal sleeve
26 Drive collar
27 Pin
28 Clamping sleeve
30, 32 Hexagon bolt
31 Setting device


F Flush
LBO Liquid barrier/buffer OUT
LBI Liquid barrier/buffer IN

MBS682-PTA

Features

  • API 682 Category 2 and 3, Type C, Arrangement 2 and 3 seal
  • Dual seal in face-to-back arrangement
  • Balanced
  • Cartridge unit
  • Rotating metal bellows
  • Shrink fitted seal rings and solid mating rings

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 rings: Blister resistant carbon,
Silicon carbide SSiC (Q1), RBSiC (Q2)
Mating rings:
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 - 2CW-CW
  • API 682 4th ed. Cat. 2/3 - 3CW-FB



Product variants