Mechanical Seals

Type 11

Diaphragm Seals

Single spring, resilient, rubber diaphragm seal with two working length options, and a Type 11 boot mounted stationary, as standard, to suit common originally American housing sizes.

A widely utilised seal type, highly suited to general duties, capable of long service life. 

Also available as Type 11J with Type 31 centrally ‘O’-Ring mounted statoinary to fit same housing sizes and working lengths.

Can also be supplied as a rotary seal only to be installed with a variety of stationary seals.


  • Single spring, resilient, rubber Diaphragm Seal
  • Highly suited to general duties, capable of long service life.
  • Supplied with a Type 11 boot mounted stationary as standard

Operating Limits

  • Temperature: -30°C to +150°C
  • Pressure: Up to 12.6 bar (180 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

All fields are required