DF-SA DiamondFace

DF-SA DiamondFace
Item Description
1 Seal ring
2 O-Ring
3 Spring
4 O-Ring
5 Seat collar
6 Mating ring (DiamondFace coated)
7 Shaft sleeve
8 Pumping sleeve
9 Cover

DF-SA DiamondFace


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


  • Resistant to electrochemical corrosion.
  • Extremely long service life (>40,000 h).
  • No dosing system, no cooling circuit conditioning required.
  • Diamond coating provides very low friction, thus reduced power consumption.
  • Deformation-optimized for high sliding velocities and medium pressures.
  • Economical due to standardized 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.

Operating range

Shaft diameter:
d1* = 120 ... 250 mm (4.72" ... 9.84")
Pressure: p1 = 70 bar (1,015 PSI)
Temperature: t = 300 °C (572 °F)
Sliding velocity: vg = 70 m/s (330 ft/s)
Axial movement: ±3 mm

* Other sizes on request


Seal face: Composite carbon
Seat: SiC DiamondFace coated
Secondary seals: EPDM (E), FFKM (K)
Springs: CrNiMo steel (G)
Metal parts: CrNiMo steel (G)

Recommended piping plans

API Plan 02 + 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


  • 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


  • Cartridge
  • Balanced
  • Independent of direction of rotation
  • Stationary multiple springs
  • Spring protection sleeve
  • Variant for operation with pressureless quench available (HRC2000N)
  • Dual seal with and without pumping screw (HRC3300NF, HRC3300N) available

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