What are the best options for high purity reciprocating seals at 3000psig?

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SUMMARY

The discussion focuses on finding high purity reciprocating seals suitable for applications at 3000psig, specifically mentioning the AS 568 size -002 o-ring for a nominal ∅.046" shaft. Teflon and FFKM materials, such as Kalrez, are considered acceptable, with FFKM seals identified as the most viable option despite their high cost. The possibility of using stacked split rings as an alternative sealing method is also explored, although concerns about friction on the shaft are raised.

PREREQUISITES
  • Understanding of AS 568 o-ring sizing
  • Knowledge of high purity sealing materials, specifically Teflon and FFKM
  • Familiarity with pressure ratings in sealing applications
  • Basic concepts of friction and sealing mechanisms
NEXT STEPS
  • Research FFKM seal suppliers and pricing options
  • Investigate the design and application of stacked split rings for sealing
  • Explore the properties and applications of spring energized Teflon seals
  • Learn about encapsulated o-rings and their manufacturing options
USEFUL FOR

Engineers, product designers, and procurement specialists involved in high-pressure sealing applications, particularly in industries requiring high purity standards.

blakej
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I have an application which requires a high purity reciprocating seal at 3000psig. An AS 568 size -002 o-ring is the size I need or close to it (must work on an nominal ∅.046" shaft.) Teflon or FFKM (like Kalrez etc.) would be acceptable, but spring energized Teflon seals are tougher at that size for 3kpsig. I've thought about encapsulated o-rings but haven't found anyone who makes them at that size. FFKM seals seem like the best bet at this point, they're just so incredibly expensive. If anyone has other options, thoughts, or sources to check out, I'd love to hear them. Thanks!
Blake
 
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Any chance that you could use stacked split rings, like automotive piston rings but with the gaps offset from each other to provide total sealing, or would that put too much friction on the shaft?
 
Danger said:
Any chance that you could use stacked split rings, like automotive piston rings but with the gaps offset from each other to provide total sealing, or would that put too much friction on the shaft?

Very interesting thought. I'll explore that one. Thanks.
Blake
 

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