Type A1 - Balanced Diaphragm Mechanical Seal | Vulcan Seals
Mechanical Seals

Type A1

Diaphragm Mechanical Seals

Type A1 Diaphragm Mechanical Seal

Robust, long working length, highly accommodating and reliable, rubber diaphragm balanced seal, which provides enhanced seal capability, performance and life. The Type A1 has a retainer backing plate, a narrow profile and a no spring base plate.

Improved design features further enhance this popular seal. Available with a Type 20 boot-mounted seat as standard, suitable for originally common UK housing dimensions.

Also available as Type A1H with Type 21 centrally 'O'-Ring Mounted stationary seal.


  • Robust, rubber diaphragm balanced Seal
  • Long working length
  • Highly accomodating and reliable

Operating Limits

  • Temperature: -30°C to +150°C
  • Pressure: Up to 26 bar (377 psi)
  • For full Performance Capabilities please download data sheet

Limits are for guidance only. Product performance is dependent on materials and other operating conditions.

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  • Vulcan Type Number
  • Shaft size
  • Seal face materials
  • Elastomer materials
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