The National Board of Boiler and Pressure Vessel Inspectors is the third party that certifies our manufacturing/quality program. They also test and certify flow on each code valve periodically.
The NB Certificate and Samples of the CoC are available in the Quality section of the Downloads area. Downloads Page The National Board “Redbook” or the Published List of Certified Valve Manufacturers also contains this information. We are listed as the F.C. Kingston Company (KNG).
All the valves are listed there in Section B, Page 40 of 88. http://www.nationalboard.org/SiteDocuments/NB18/PDFs/NB18ToC.pdf