Item Description
1 Seal face
2 Face housing
3 Seat
4 Shaft sleeve
5 Housing
6 Set ring
7 High pressure throttle ring
8 Leakage collection
9 Throttle ring
Typical fluids in crude oil applications



  • Robust seal design – especially for demanding crude oil applications
  • Compact cartridge seal for small seal chambers
  • Single unpressurized seal with containment high-pressure throttle design
  • Stationary spring loaded unit
  • Balanced seal faces in materials with high thermal conductivity and strength
  • Inserted seal face
  • Multi-point injection of the flush fluid optional
  • Seal faces can be equipped with lubrication enhancing hydropads and/or DiamondFace technology


Operational Excellence
  • High performance seal design for alternating media properties and operating conditions with high pressures and sliding velocities
  • Low amount of heat generation, hence minimal temperature rise in the seal faces
  • Seal faces have soft torque transmission
  • Seal faces are shrouded in steel colars so that hey cannot break apart in pieces in an emergency case
  • Resistant to alignment issues between the pump case and shaft because of stationary springs
  • Atmosphere side high pressure double throttle design suitable for full product pressure
  • Seal face materials are resitant to solids in the pumped fluid
  • Optimized for operation also with sand or particles

Technical Excellence
  • Simple installation due to pre-assembled cartridge
  • Seal faces are designed with FEA & CFD and qualified & tested in the lab
  • Can be fitted in older pumps with small seal chambers or stuffing boxes
  • High degree of standardization ensures fast deliveries and smart part inventories

Sustainability Excellence
  • Zero emission seal design for sustainable environmental protection
  • Minimized friction and energy consumption

Operating range

Shaft diameter:
d1* = 50 ... 150 mm (1.97" ... 5.91")
Pressure: p1 = 100 bar (1,450 PSI),
Static: up to 150 bar (2,175 PSI),
Dynamic: up to 100 bar (1,450 PSI)
Temperature: t = -20 ... +100 °C (-4 ... 212 °F)
Sliding velocity: vg = 50 m/s (164 ft/s)
Axial movement: ±1 mm

* Additional sizes upon request


Seal face:
Silicon impregnated carbon (Q3), DiamondFace
Stationary seat: Silicon carbide (Q2), DiamondFace
Secondary seals: FKM (V), FFKM (K)
Springs: Hastelloy® C-4 (M)
Metal parts: CrNiMo steel (G), Duplex (G1), Super Duplex (G4), Titan (T2), Hastelloy® C-4 (M)

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

Inquire about individual solutions

We develop and produce customer-specific special and individual solutions for every application.

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