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Swing Check

What is the difference between a swing check valve with API trim #5 and API trim #16?

*Trim no:5 :

Disc sealing surface: Stellite 6
Seat sealing surface: Stellite 6
Pin : A 182 F6a

I am not finding a trim no:16 for swing check valve, but it is available for gate valve.[ Seat / Disc, Backseat,Stem refers to trim no:16 for a gate valve.]

Better you understand what is trim .Trim no. is different part with same or different MOC/Hardness.

Visit:

http://www.sunbeltsupply.com/docs/API%20600%20Trim%20Chart.pdf

http://www.ario.ro/UserFiles/File/API%20SWING%20CHECK%20VALVE.pdf

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