Mechanical Seals

Type 20

Diaphragm Seals

Resilient, single spring, rubber diaphragm seal with a Type 20 boot-mounted stationary as standard, to suit original common UK housing sizes. A widely utilised seal type highly suited to general duties, capable of long service life.

Also available as Type 20H with Type 21 centrally ‘O’-Ring mounted stationary to fit same housing sizes and working lengths.


  • Resilient single spring, rubber Diaphragm Seal
  • Supplied with a Type 20 boot mounted stationary as standard
  • Designed to suit original common UK housing sizes.

Operating Limits

  • Temperature: -30°C to +150°C
  • Pressure: Up to 8 bar (116 psi)
  • For full Performance Capabilities please download data sheet

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

Send us an enquiry

To help us provide you with the best answer, please provide as much of the following as possible:

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

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