Type 8620

Manufacturer: John Crane

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.

• 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 minimize 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 minimizes asymmetric face distortions

STANDARD MATERIALSSeal faces Cranite vs. SiC/WC -50 to 300°C Carbon vs. SiC -50 to 250°C O rings/secondary seals Fluorocarbon -25 to 200°C (Hydrocarbon)

PRESSURE LIMITSVacuum to 200 bar(g)


SIZE RANGE41mm to 206mm