Type A4 - Balanced Diaphragm Mechanical Seal | Vulcan Seals
Mechanical Seals

Type A4

Diaphragm Mechanical Seals

Type A4 Diaphragm Mechanical Seal

Robust, short working length, highly accommodating and reliable, rubber diaphragm balanced seal which provides enhanced seal capability, performance and life.

Suitable for common originally American standard housing and working length dimensions. Improved design features further enhance this popular seal.

Available as Type A4 with a Type 11 boot-mounted seat, or as Type A4J with a Type 31 ‘O’-Ring mounted stationary.


  • Robust, rubber diaphragm balanced Seal
  • Short working length
  • Highly accommodating and reliable Seal

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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