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Single Spring, Elastomer
Bellows Seal

Features &


  • Cost effective seal common to many process pumps

  • Bellows design helps compensate for face wear

  • Bi-directional

  • Multiple face and elastomer choices

  • Equivalent to European DIN standard Type 21’s

  • Most common metric seat available as requested

Standard Materials of Construction


  • Carbon Graphite (Resin Impregnated), Antimony-Impregnated Carbon, Silicon Carbide, Tungsten Carbide


  • Buna, Viton®, Aflas®, Neoprene, EPDM


  • 304, 316, Monel

Operating Limits

  • Pressure: to 150 PSI

  • Temperature: -40°F to +400°F.

ES21 drawing
ES21 dimensions
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