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Cryogenics | Valves

Cryogenic ball valve seat seal


Customer had been using standard PCTFE energised lip seals but was experiencing inconsistency in performance leading to a 50% failure rate with their valves under testing. This was a huge issue causing late deliveries of valves to their customers and also carrying large cost implications due to the need to strip down valves, replace seals and repeat testing after each failure.


3” Class 600 ball valve seat seal

  •  Temperature: -196°C to ambient
  •  Pressure: 22 bar
  •  Media: Nitrogen
  •  Groove: OD 73.17 mm, ID 62.27 mm, LG 6.25 mm
  •  Intermittent dynamic movement
Existing solution

PCTFE lip seals

James Walker solution

An asymmetrical Unilion U01 lip seal configuration was recommended and installed to counteract performance inconsistency for this critical service. This was provided in our Fluolion 22 modified PTFE jacket sealing material, along with double heat-treated cobalt chromium alloy helicoil springs to ensure seal force was optimised.

Results and benefits

The Unilion seal was installed and successfully passed testing during the customers trials. This field-proven and tested configuration has provided outstanding reliability and consistent performance allowing valve projects now to be supplied on time and within budgeted cost.

Reduction of costs caused by failed testing
Improved performance and consistency
Improved reliability and reputation
Reduced project lead time
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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

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