Cartex Dual seals

• Dual seal
• Cartridge
• Balanced
• Independent of direction of rotation
• Double pressure balanced
• Integrated pumping device
• Variants available: for eccentric screw pumps (-Vario) and gas-lubricated version (-GSDN)

• Ideal seal for standardizations
• Universal applicable for packings conversions, retrofits or OEM
• No dimensional modification of the seal chamber (centrifugal pumps) necessary, small radial installation height
• No damage of the shaft by dynamically loaded O-Ring
• Extended service life
• Installation faults are avoided, cost-effective
• No damage caused by dirt entered during assembly
• Straightforward and easy installation due to pre-assembled unit (reduced down-times)
• Individual adaptation to pump design possible
• Customer specific versions available

Shaft diameter: d1 = 25 … 100 mm (1.000″ … 4.000″
Other sizes on request
Temperature: t= -40 °C … 220 °C (-40 °F … 428 °F)
(Check O-Ring resistance)
Sliding face material combination BQ1
Pressure: p1 = 25 bar (363 PSI)
Sliding velocity: vg = 16 m/s (52 ft/s)

Sliding face material combination Q1Q1 or U2Q1
Pressure: p1 = 20 bar (290 PSI)
Sliding velocity: vg = 10 m/s (33 ft/s)

Barrier fluid circulation system:
p3max = 25 bar (363 PSI)
Δp (p3 – p1)_ideal = 2 … 3 bar (29 … 44 PSI),
7 bar (102 PSI) for barrier media with poor lubricating properties)

Pump startup:
Δp (p3 – p1)max = 25 bar (363 PSI) allowed

Recommended supply medium: max. ISO VG 5
Axial movement: ± 1.0 mm, d1 >= 75 mm ± 1.5 mm

Seal face: Silicon carbide (Q1), Carbon graphite resin impregnated (B), Tungsten carbide (U2)
Seat: Silicon carbide (Q1)
Secondary seals: FKM (V), EPDM (E), FFKM (K), Perfluorocarbon rubber/PTFE (U1)
Springs: Hastelloy® C-4 (M)
Metal parts: CrNiMo steel (G), CrNiMo cast steel (G)

Recommended piping plans

The EagleBurgmann QFT1000 buffer system and QFT2000 vessels are suitable for Cartex-DN in back-to-back arrangement. The EagleBurgmann TS1016 and TS2000 thermosiphon systems support double and back-to-back seal configurations.