Single Spring Elastomer
Bellows Seal 

A21

Features &

Benefits

  • Cost effective seal common to many process pumps

  • Bellows design helps compensate for face wear

  • Bi-directional

  • Multiple face and elastomer choices

  • Equivalent to John Crane Type 21, Pac-Seal Type 21, US Seal C head

Standard Materials of Construction

Faces:

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

Elastomers:

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

Metallurgy:

  • 304, 316, Monel

Operating Limits

  • Pressure: 150 psi 10.3 Bar

  • Temperature: -40°F to +400°F.

*All industry standard “PS” numbers and seal styles are available. Just provide us with the “PS” number required or one used on previous orders.

A21 drawing
A21 dimensions

Get in Touch

888-730-2739 or

802-524-7100

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