Cartex Single seals
Cartex Single seals


  • Single seal
  • Cartridge
  • Balanced
  • Independent of direction of rotation
  • Single seals without connections (-SNO), with flush (-SN) and with quench combined with lip seal (-QN) or throttle ring (-TN)
  • Additional variants available for ANSI pumps (e.g. -ABPN) and eccentric screw pumps (-Vario)


  • Ideal seal for standardizations
  • Universal applicable for packings conversions, retrofits or original equipment
  • 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
  • Straightforward and easy installation due to pre-assembled unit
  • Individual adaptation to pump design possible
  • Customer specific versions available

Operating range

Cartex-SN, -SNO, -QN, -TN, -Vario

  • Shaft diameter:
    d1 = 25 … 100 mm (1.000″ … 4.000″)
    Other sizes on request
    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 = 12 bar (174 PSI)
    Sliding velocity: vg = 10 m/s (33 ft/s)
  • 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), Perflourocarbon rubber/PTFE (U1)
  • Springs: Hastelloy® C-4 (M)
  • Metal parts: CrNiMo steel (G), CrNiMo cast steel (G)
1Seal face
2, 5, 7O-Ring
6Shaft sleeve
8Drive collar
9Set screw
10Snap ring
12Assembly fixture (remove after intallation)
15Screw plug
16Lip seal (-QN), throttle ring (-TN)

Recommended applications

  • Process industry
  • Petrochemical industry
  • Chemical industry
  • Pharmaceutical industry
  • Power plant technology
  • Pulp and paper industry
  • Water and waste water technology
  • Mining industry
  • Food and beverage industry
  • Sugar industry
  • Universally applicable
  • Centrifugal pumps
  • Eccentric screw pumps
  • Process pumps