Component Seals

Bellows Seals

Bellows Seals are mechanical seals which use flexible bellows as secondary dynamic seals for their primary seal ring. This feature shows a distinctive advantage in extreme chemical or thermal conditions.
Ettem bellows seals are offered in cases where such conditions must be met.

Bellows Seals

Type 500R – Welded Metal Bellows Seals

  • For extreme temperatures
  • Inherently balanced internal Bellows seal
  • No springs needed. Bellows provides for even load distribution
  • Bellows acts as a flexible secondary seal without shaft fretting
  • Flexible graphite static seal
  • Large tolerance to axial and angular motions

Temperature Range
-75°C to 425°C
Pressure Range
Vacuum to 20 bar
Speed Range
0 to 25 m/sec

* Depending on Materials, Size and Operating Conditions

Type 520 – Stationary Welded Metal Bellows Seals

  • Stationary seal for high speeds and larger misalignments
  • For extreme temperatures
  • Inherently balanced internal Bellows seal
  • No springs needed. Bellows provides for even load distribution
  • Bellows acts as a flexible secondary seal without shaft fretting
  • Flexible graphite static seal
  • Large tolerance to axial and angular motions

Temperature Range
-75°C to 425°C
Pressure Range
Vacuum to 20 bar
Speed Range
0 to 50 m/sec

* Depending on Materials, Size and Operating Conditions

Type 170/171 – PTFE Bellows Seals

  • External Teflon® Bellows seal
  • Process Shielded metal parts
  • Glass-filled PTFE face for Type 170
  • Silicon Carbide Face for Type 171
  • Pre-set operating length with setting tabs in Imperial and Metric sizes
  • Multi-coil spring design for even load distribution
  • Large tolerance to axial and angular motions

Technical summery table*

Temperature Range
-50°C to 120°C
Pressure Range
Vacuum to 6 bar
Speed Range
0 to 10 m/sec

* Depending on Materials, Size and Operating Conditions

Type 500 – Welded Metal Bellows Seals

  • Internal, inherently balanced Metal Bellows seal
  • No springs needed. Bellows provides for even load distribution
  • Bellows acts as a flexible secondary seal without shaft fretting
  • Field-Interchangeable static seals
  • Large tolerance to axial and angular motions

Technical summery table*

Temperature Range
-40°C to 300°C
Pressure Range
Vacuum to 20 bar
Speed Range
0 to 10 m/sec

* Depending on Materials, Size and Operating Conditions

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