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ANSI Class 6 standard origins?
2

ANSI Class 6 standard origins?

ANSI Class 6 standard origins?

(OP)
Hello everyone,

On a recent search for PVC butterfly valves, I noticed that most companies refer to ANSI Class 6 shut-off as criteria for valve quality.  I need to know what ANSI Class 6 shut-off means, and how the valve is built/tested to meet this criteria.  What standard does the ANSI Class 6 classification originate?  I looked on the ANSI site, and throughout the web, but can't seem to find it.  Anybody have a clear definition of ANSI Class 6, and a source to refer to?

RE: ANSI Class 6 standard origins?

ANSI has 6 classes to classify valve leakage performance, where Class I is the least strict and Class VI is for the tightest.

Class I requires no testing while Class VI requires that leakage throught the valve don“t exceed certain amounts depending of the size of the valve, Test is made with air or nitrogen and a differential pressure across the valve of 50 psig or max rated pressure wichever is lower.

RE: ANSI Class 6 standard origins?

Depending upon the control valve capacity, ANSI Class V can be tighter than Class VI as the measurements differ.  These are control valve leakage classes --  NOT Shutoff Valve leakage classes.  If you look at the standard you will see FCI, the name of the organization that originated the standard.  I think that the F was for Fluidic or Flow, C for Control and I for Institute.

John

RE: ANSI Class 6 standard origins?

     The reference standard for control valves leakage classes is FCI-70-2 (previously named "ANSI B 16.104"; latest revision: 2003) or equivalent IEC 60534, Part 4, Amendment 1.

     Please take also a look, within this Forum, at:
          -  Thread408-23297;
          -  Thread408-45258;
          -  Thread174-76111 and Thread408-76110.


Hope this helps,    'NGL

  

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