Item Description
1 Seal face
2 O-Ring
3 Spring
4 O-Ring
5 Seat collar
6 Seat
7 Shaft sleeve
8 Pumping sleeve
9 Cover
10 Throttle ring



  • Cartridge design
  • Single seal
  • Balanced
  • Dependent on direction of rotation
  • Integrated pumping device
  • Stationary spring loaded unit
  • Inserted seal face
  • Rotating carbon seat


  • Deformation-optimized seal for high sliding velocities and medium pressures
  • Economical due to standardized inner components
  • High flexibility due to adaptation of the connection parts to the pump seal chamber
  • Optimum heat dissipation due to integrated pumping device and optimized seat / seal face design
  • Insensitive to shaft deflections due to stationary design
  • Pre-assembled unit for quick and easy installation
  • Only small number of components

Operating range

Shaft diameter:
d1* = 120 ... 250 mm (4.72" ... 9.84")
Pressure: p1 = 50 bar (725 PSI)
Temperature: t = +300 °C (+572 °F)
Sliding velocity: vg = 65 m/s (213 ft/s)
Axial movement: ±3 mm

* Other sizes on request


Seal face: Silicon carbide (Q), SiC-C-Si Silicon impregnated carbon (Q3)
Seat: Carbon graphite resin impregnated (B),
SiC-C-Si Silicon impregnated carbon (Q3)
Secondary seals: EPDM (E), FFKM (K)
Springs: CrNiMo steel (G)
Metal parts: CrNiMo steel (G)

Recommended piping plans

API Plan 02 + API Plan 23 (with jacket cooling)

Similar products


  • Dry gas seal for multiphase pump applications
  • DiamondFace sliding surface technology
  • Ideal for applications with Ethane, CO2, and similar media with low vapor margins
  • Shrouded rotating ring
  • Bi-directional
  • Ready-to-fit cartridge unit
  • Single, double, tandem, and tandem with intermediate labyrinth available

DF-SA DiamondFace

  • Cartridge design
  • Single seal
  • Balanced
  • Integrated pumping device
  • Stationary spring loaded unit
  • Inserted seal ring
  • Rotating mating ring
    (DiamondFace coated)


  • Single seal
  • Balanced
  • Independent of direction of rotation
  • Multiple springs stationary
  • Seat rotating
  • Seat arranged directly behind the impeller
  • Spring protection sleeve
  • Variant with cylindrical spring and acc. EN 12756 (HRZ1) available
  • Variant as cartridge with/without guide sleeve for application with/without quench (HR2, HR3)
  • Dual seal as cartridge unit (HRKS-D) available

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