Valve manufacturers, suppliers, and repairers must pass a variety of certifications before they can perform assembly, repair, and other services on industrial valves. Below is an overview of the main valve certifications and authorizations applicable in the valve industry.

Industry Certifications

Industry certifications are issued by national organization and apply to valves produced by all valve manufacturers.

National Board Certifications

The National Board of Boiler and Pressure Vessel Inspectors sets the industry standards for pressure relief devices and is responsible for accrediting repair and alteration companies. The National Board offers three stamps and one mark. Organizations must obtain separate authorization for each type of valve they service.

R Stamp

An R stamp signifies that an organization has earned a National Board Certificate of Authorization to repair and/or alter pressure-retaining items including boilers and pressure vessels. According to the accreditation guidelines, “Organizations may be authorized to perform repairs only, or repairs and alterations. Organizations may also be authorized to perform design only, metallic or non-metallic repairs and/or alterations, either in the shop only, field only, or in both shop and field.” This authorization must be renewed every three years.

Learn more about the R Stamp Certificate of Authorization program.

VR Stamp

A VR stamp signifies that an organization has earned a National Board Certificate of Authorization to repair pressure relief valves, in the shop and/or in the field. This authorization must be renewed every three years.

Learn more about the VR Stamp Certificate of Authorization program.

NR Stamp

An NR stamp signifies that a company has earned a National Board Certificate of Authorization to repair and replace nuclear components, in the shop and/or in the field. To earn this certification, an organization’s activities must be “performed in accordance with the National Board Inspection Code (NBIC) and American Society of Mechanical Engineers Boiler and Pressure Vessel Code (ASME BPV Code) Section XI requirements.” This authorization must be renewed every three years.

Learn more about the NR Stamp Certificate of Authorization program.

NB Mark

The NB mark signifies that a pressure relief device has been certified by the National Board. The NB mark is used jointly with ASME stamps to assure that pressure relief devices have gone through design review, rating factor testing, and production sample testing. Following the successful completion of a quality system review, organizations may become accredited to apply this mark to pressure relief devices.

Learn more about the NB Mark program.

ASME Certification Mark

The ASME Certification Mark indicates that a device is in compliance with the ASM Boiler and Pressure Vessel Codes (BPVCs). Both individuals and organizations may be authorized to use the ASME Certification Mark. The Certification Mark is used with a variety of certification designators, including the following, which apply to the assembly, setting, and testing of pressure relief devices:

V = Power boilers safety valves
HV = Heating boilers safety valves
NV = Nuclear installation and shop assembly
UV = Pressure vessels safety valves
UD = Pressure vessels rupture discs
TD = Transport tanks pressure relief devices
This authorization must be renewed every three years. Organizations must obtain separate authorization for each type of valve.

Learn more about the ASME Certification Mark.

Valve Manufacturer Certifications

Valve manufacturer certifications indicate that an organization’s technicians have undergone a comprehensive factory training program for services related to an individual manufacturer’s products.

GE Consolidated Authorized Green Tag Center (GTC)

Consolidated Green Tag Centers are organizations whose technicians have completed GE’s Green Tag training and certification program covering Consolidated pressure relief valves and repair services. GTCs are authorized to carry a large inventory of Consolidated valves as well as to provide a complete package of services including machining, measuring, testing, documentation, and valve repair. The GTC designation also signifies that valves comply with both National Board and ASME standards. To retain their authorization, Green Tag Centers must pass an audit every year.

Masoneilan Authorized Repair Center (MARC)

A Masoneilan Authorized Repair Center (MARC) is a facility whose technicians have been factory-trained and authorized to repair GE’s Masoneilan control valves and valve products.

This entry was posted in The Valve Expert. Bookmark the permalink.