Features
- 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)
Advantages
- 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
- No damage caused by dirt entered during assembly
- Straightforward and easy installation due to pre-assembled unit
- Individual adaptation to pump design possible
- Customer specific versions available
Operating range
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
Materials
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)