Item Description
1 Seal ring with bellows unit
2 Gasket
3, 10, 19 Gland plate
4, 27 Spring washer
5 HSH Cap screw
6 Mating ring
7, 11, 25 Graphite ring
8 Seal sleeve with pumping ring
9 Retaining ring
22 Drive collar
26 Clamp sleeve
28, 31 Hexagon bolt
29 Set screw
30 Setting device


LBO Liquid barrier OUT
LBI Liquid barrier IN

LY9DSTT

Features

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

Advantages

  • Very compact design
  • Suitable for higher speeds
  • Good followability due to no influence from run-out, squareness or vibration of the shaft
  • Low heat generation and power consumption due to narrow seal face width
  • Longer seal life
  • Also available in double ply 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

Operating range

Shaft diameter: d1 = 20 ... 110 mm (0.79" ... 4.33")
Pressure single ply bellows: p = vacuum ... 20 bar (... 290 PSI)
Pressure double ply bellows: p = vacuum ... 35 bar (... 508 PSI)
Temperature: t = -130 ºC ... +400 ºC (-202 ºF ... +752 ºF)
Sliding velocity: vg ... 50 m/s (... 164 ft/s)

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 - 3CW-FF