Type 1645B/1645BS - Multiple Spring Mechanical Seals | Vulcan Seals
Mechanical Seals

Type 1645B/1645BS

Multiple Spring Mechanical Seals

Type 1645B Multiple Spring Mechanical Seal

Narrow profile, multiple spring Mechanical Seal, designed for the common American ANSI B73-1974 centrifugal pump standard.

Frequently fitted with Type 23 PTFE boot-mounted stationary seal.

Types 1645B and 1645BS are balanced designs for stepped-shafts.

The stock size is always set by the shaft size under the seal body.

A PTFE backup ring is recommended to be specified for higher pressure ‘O’-Ring applications.


  • Narrow profile, Multiple Spring Mechanical Seal
  • To suit common American ANSI B73-1974
  • Fitted with Type 23 P.T.F.E boot-mounted Stationary

Operating Limits

  • Temperature: -30°C to +140°C
  • Pressure: Up to 40 bar (580 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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