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SWMechanical (Mechanical) (OP)
25 Aug 08 12:21
Hi,

I am looking to purchase a trunnion ball valve for sour gas service at 38C, 285 psig. What would be the best seal material?

The manufacturer has a list of choices:

Viton
HNBR
EPDM
Aflas


Thanks,
JLSeagull (Electrical)
25 Aug 08 13:27
For sour gas, consider Aflas before ethelene propylene rubber (EPDM) or Nitrile (Buna N, HSN, HNBR).  I used to keep lots of elastomer data on my hard drive but don't have it now.  You can download lots of material compatibility charts from the web.  Consider Kalrez when money is no object.
NGiLuzzu (Mechanical)
1 Sep 08 3:05
SWMechanical,
         maybe you'll find useful to read thread408-201095: Methanol vs Viton seals in valves within this Forum.

         If you input your service conditions in the "Application Guides" mentioned therein,  you'll probably find the more suitable polymers for your application...

Hope this helps,         'NGL

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