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Bellow seals

JBMFO, AKA MFL85N or 680 Metal Bellow Mechanical Seal
  • JBMFO, AKA MFL85N or 680 Metal Bellow Mechanical Seal Rotary
  • JBMFO, AKA MFL85N or 680 Metal Bellow Mechanical Seal
  • 680M Metal Bellow Mechanical Seal
  • 680M Metal Bellow Mechanical Seal
  • JBMFO, AKA MFL85N or 680 Metal Bellow Mechanical Seal


SKU : JBMFO, AKA MFL85N or 680

Basic Features

  • Structure: Single End
  • Pressure: Medium Pressure Mechanical Seals
  • Speed: General Speed Mechanical Seal
  • Temperature: High Temperature Mechanical Seal
  • Performance: High Temperature and Wear
  • Standard: DIN24960, ISO3069, GB6556, EN12756
  • Model NO.: JBMFO, AKA MFL85N or 680 and 680M
  • Balance: Balanced
  • Specification: Inner Diameter: 25 mm to 100 mm

Product Detailed Description

JBMFO, AKA MFL85N or 680 and 680M Metal Bellow Mechanical Seal

Structural Features: single end, balanced, independent direction of rotation, bellow transmission. The bellow provides sealing faces with the closing force and also transmits the torque. The O-ring does not have axial movements so it has good tracing ability and strong capacity of resisting disturbance. This seal component is easy to install and adjust and has especially good performances of being used in medium-and-low viscosity mediums.

Industrial Standards: DIN24960, ISO3069, GB6556, EN12756

Scopes of Application: widely used in petrochemical engineering, oil refining, chemical processing, chemical fiber manufacturing, food and beverage processing, pharmacy, thermoelectricity and paper making. Designed for chemical pumps, oil pumps, screw pumps, compressors and oil extraction equipment.

  • Operation Parameters:

    • Pressure: - 0.1 ~ 2.5 MPa
    • Temperature: - 40 ~ 200 ºC
    • Linear Speed: 15 m/s or less


    • Rotary Ring Face: Carbon/SiC/TC
    • Stationary Ring Face: SiC/TC
    • Elastomers: NBR/EPDM/Viton/Aflas/FFKM
    • Springs: SS316/AM350/Inconel 718/HC-276
    • Metal Parts: SS316/SS316L/4J42/Hastelloy

    Mediums: hot water, oil, liquid hydrocarbon, acid, alkali, solvents, paper pulp and other medium-and-low-viscosity content.

    Customization: Changes of materials for getting other operating parameters are possible. Contact us with your requirements.

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