Overview: Bellows Seals

Mechanical seals with bellows technology have various benefits and applications.  Edge welded bellows technology allows for a variety of materials including stainless steel, Inconel®, and Hastelloy®.  With these options, various liquids and gases can be measured as well as extreme temperatures.

Bellows mechanical seals can eliminate O-rings to increase compatibility and reduce potential leak paths. The metal bellows design allows for higher flow rates and less clogging than traditional spring seals. Bellows seal technology creates a uniform outside wall for uniform movement under hydraulic pressure.

With precision stamping and proprietary welding techniques, BellowsTech manufactures its edge welded bellows within tight tolerances in its Ormond Beach, Florida facility.  Bellows mechanical seals can be manufactured with O-ring grooves, flanges, and carbon-face seals to make the best possible connection to customer assemblies. BellowsTech mechanical seals are 100% visually inspected throughout the manufacturing process and confirmed with mass spectrometer testing.  BellowsTech can offer various sizes and stroke lengths to satisfy custom demands. Applications in the aerospace, oil, gas, petrochemical, pharmaceutical, water and paper industries are common markets for bellows mechanical seals, due to their reliability, tight tolerances, and compatibility with harsh media in pump systems.

Photo of a bellows seal

Specifications – Bellows Mechanical Seals – PDF

Common Materials AM350, 316L SS, Inconel®, & Hastelloy® 276C
Thickness 0.002″ and up every 0.001″
Standard Leak Rate <1×10-9 std CC He/sec**
Size Ranges
Outside Diameter 0.358″ (9.0932mm) to 22.205″ (564mm)*
Inside Diameter 0.198″ (5.029mm) to 19.921″ (505.99mm)*
Shapes Round standard. Non-Round Available; Contact Factory.
Length Up to 96 inches (244 cm)

* For other dimensional requirements, contact the factory
** Confirm leak rate with material selected.

Bellows seals photo

Stainless Steel Bellows Assembly

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