Features
Equivalent to LL9DJUE
API 682 Category 2 and 3, Type A,
Arrangement 2 seal
Dual seal in face-to-back arrangement
Dry contact outer seal (containment seal)
Balanced
Cartridge unit
Stationary multiple springs
Solid seal faces
Operating range
Pressure (primary seal): p = vacuum ... 60 bar (870 PSI)
Pressure (secondary seal): p = 2.75 bar (40 PSI) normal operation,max. 60 bar (870 PSI) in wet operation
Temperature: -40 °C +176 °C (-40 °F +349 °F)*
Sliding velocity: ... 25 m/s (82 ft/s)
Viscosity: 300 mPas
Solids content: ... 0.5 wt.%
* Engineered up to 260 °C (500 °F) with FFKM (K) secondary seals
Materials
Seal ring (primary seal): Blister resistant carbon,Silicon carbide SSiC (Q1), RBSiC (Q2)
Seal ring (secondary seal): Special carbon
Mating ring:Silicon carbide SSiC (Q1), RBSiC (Q2)
Secondary seals:FKM (V), FFKM (K), EPDM (E), NBR (P)
Springs: Hastelloy® C-276 (M5)
Metal parts: CrNiMo steel 316 (G)
Recommended applications
Refining technology
Oil and gas industry
Petrochemical industry
Chemical industry
Power plant technology
Light volatile hydrocarbons
LPG plants
API 610 / ISO 13709 pumps
Process pumps
Advantages
Outer seal which can be used for flashing as well as non-flashing applications prevents hazardous emissions in case of inboard seal failure
Low heat generation and power consumption due to narrow seal face width of inner seal
Longer seal life
Good followability due to no influence from run-out, squareness or vibration of the shaft
Pressure-balanced design prevents mating ring being forced out under reverse pressure
No damage to shaft sleeve as dynamic
O-Ring is not in direct contact with the sleeve
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