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

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For high purity reciprocating seals at 3000psig, an AS 568 size -002 o-ring is required for a nominal ∅.046" shaft. Teflon or FFKM materials, such as Kalrez, are acceptable, but spring-energized Teflon seals are challenging at this pressure. Encapsulated o-rings are not readily available in the needed size, making FFKM seals the most viable option despite their high cost. An alternative suggestion involves using stacked split rings, similar to automotive piston rings, which could provide effective sealing without excessive friction. Exploring these options could lead to a suitable solution for the application.
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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