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Balanced Metal Bellow Mechanical Seal 40 Series (4202,4202CR)

Face Materials

  • Carbon
  • Tungsten Carbide
  • Silicon Carbide

Secondary Seal

  • ‘O’ Ring (Viton, EPR, Buna N, Aflas, Kalrez)

Metal Parts

  • SS 316 (S)
  • Alloy 20 (A)
  • Hastelloy-C (H)


  • Chemicals
  • Petrochemicals
  • Oil Refineries
  • Corrosive and abrasive

Seal Features

  • Welded Metal Bellow
  • Single Seal
  • Inherently Balanced
  • Inside Mounted
  • Independent of direction of rotation

Performance Limits

  • Size – 1” to 4”
  • Pressure – upto 20 Kg/cm2
  • Temperature - -40°C to +300°C

4202 Type seal are Welded metal bellow seals Provide high Performance Capabilities for a vast variety of shaft sealing applications involving corrosive and abrasive media. There designed for long fife operation.

Bellows eliminates the inertia problem of “hang up” which causes sluggish response in spring-loaded seals. Effective contact of sealing faces is maintained, despite shaft movement and run out.

The motion of Bellows throws off suspended particles of material which clog pusher-type seals. This self-cleaning action eliminates the cost of external flushing, filters and cyclone separators.

The Seal is inherently pressure-balanced, requiring no steps in shafts or sleeves.