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Type 8620

Balanced Stationary Multi-spring Dual Mechanical Seal

The seal is suited to a whole host of offshore, refinery and process industry duties. Its robust construction and proven heritage make it ideal for remote pipeline installations.

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8620 sm
  • 8620 sm
  • 8600 lg


  • Silicon carbide mating ring for high face stability and efficient heat dissipation
  • Cranite primary ring for face stability and resistance to abrasion
  • Optional ACR (Armoured Composite Ring) for high strength in reverse pressure operation
  • John Crane LaserFace® technology for increased fluid film stiffness and reduced heat generation under high loads
  • ESR (Elastomer Support Ring) isolates seal faces from component induced distortions and minimise friction
  • Stationary springs are unaffected by centrifugal forces for high speed operation
  • Polymer Support Rings for excellent process compatibility and prevention of hang-up
  • Multi-point injection for effective cooling and minimises asymmetric face distortions


Standard Materials

Seal faces

Cranite vs. SiC/WC

-50 to 300 °C

Carbon vs. SiC

-50 to 250 °C

O-rings/secondary seals


-25 to 200 °C (Hydrocarbon)

Pressure Limits

Vacuum to 200 bar(g)

Speed Limits


Size Range

41mm to 206mm

Recommended Applications

  • Process Pumps
  • Driven Machinery
  • Other Rotating Equipment

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