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Gated valve trim

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Maxvolonte

Maxvolonte

Petroleum
Joined
Sep 30, 2017
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12
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AR
Hi colleagues. I was wondering what HF letters on the identification plate of a gate valve means. Is it stellite gr6, Co CrA? The Stem is 13 % cr, but seat and wedge only have this HF identification letters. Any advice will be appreciated.
 
 http://files.engineering.com/getfile.aspx?folder=7724cad2-d6bf-476f-b494-0e7b533a22c6&file=IMG_20170929_111732045.jpg
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