Item Description
1 Seal ring with bellows unit
2, 5, 12, 16 O-Ring
3, 14, 19, 20 Set screw
4 Mating ring
11 Seal sleeve
13 Pumping ring
15, 17 Gland plate
18 Drive collar
21 Setting device
22 HSH Cap screw


LBO Liquid barrier OUT
LBI Liquid barrier IN

LY9DZSS

Features

  • API 682 Category 2 and 3, Type B, Arrangement 3 seal
  • Dual seal in back-to-back arrangement
  • Same seal size of inboard and outboard seal
  • Balanced
  • Cartridge unit
  • Rotating metal bellows
  • Shrink fitted seal rings and solid mating rings

Advantages

  • Compact design
  • Bellows design allows use of balanced seal with plain sleeve
  • 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
  • Low heat generation and power consumption due to narrow seal face width
  • Longer seal life

Operating range

Shaft diameter: d1 = 20 ... 110 mm (0.79" ... 4.33")
Pressure: p = vacuum ... 20 bar (290 PSI)
Temperature: t = -40 °C ... +200 °C (-40 °F ... +392 °F)
Sliding velocity: vg ... 23 m/s (75 ft/s)

Materials

Seal rings: Blister resistant carbon
Mating rings:
Silicon carbide SSiC (Q1), RBSiC (Q2)
Bellows: Hastelloy® C-276 (M5),
option: Inconel® 718 (M6)
Secondary seals:
FKM (V), FFKM (K), EPDM (E), NBR (P)
Metal parts: CrNiMo steel 316 (G),
Hastelloy® C-276 (M5)

Standards and approvals

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