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Spring‑energised seals

The high‑performance answer to fluid sealing problems where conventional products fail to give the integrity or reliability required.

Spring-energised seals are far from new - we have been manufacturing them since the 1940s. But we now offer a full range of Unilion precision-engineered products that meet the following parameters:

  • Used successfully on applications at up to 103 MPa/15000 psi
  • Cryogenic duties down to -260°C
  • Temperature excursions up to +300°C
  • Resistance to corrosive media
  • Efficient dynamic operation following long stationary periods

Based on these operational benefits, we recommend Unilion for applications that preclude the use of more conventional elastomeric/polymeric seals on arduous duties in areas such as:

  • Oil and petrochemical
  • Cryogenic plant
  • Aerospace
  • Food and pharmaceutical processing
  • Automotive and general industry

Moreover, Unilion spring energised seals have no storage period limitation. They can safely be held in stock on-site to meet OEM and maintenance requirements.

As a single Unilion can often perform three sealing duties - static, reciprocating and rotary - this can also reduce your stockholding requirements and simplify inventory control.


Unilion spring energised seals guide


Unilion® standard profiles

An overview of how the spring energised seal works and details of our standard Unilion profiles.

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Unilion® standard profiles

Fluolion® materials

An overview of our standard materials for Unilion spring energised seal jackets.

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Fluolion® materials
Our technology


Whilst a decision on the proposed PFAS regulation, and the likely timeline for implementation, are still being considered by the ECHA, James Walker is proactively looking at, and qualifying, alternative materials and working with its suppliers to ensure sealing materials are available that will offer the required levels of performance and be compliant with any proposed regulations.

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Expert to Expert

Want to discuss your project, engineering or materials challenge expert to expert? Simply provide us with your contact details and a little information about the application you are working on, and one of our experts will contact you as soon as possible.

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