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Commercial Grade Safety Related Valve Dedication for Nuclear
Commercial Grade Safety Related Valve Dedication for Nuclear
Commercial Grade Safety Related Valve Dedication for Nuclear
Commercial Grade Dedication
  • Certificate of Conformance

  • Certified Material Test Reports (Body, Bonnet & Bolting)

  • Chemical Certifications 

  • Seismic Certification 

  • Manufacturer’s Certified Outline Drawing

  • Material Traceability 

  • NDE (MT, PT, RT, UT, VT) 

  • ASME B16.34/MSS SP 61 Hydrostatic Shell & Seat Leak Test Report

  • 10CFR 50 App B QA Program in accordance with approved Dedication Plan.

  • Inspection & Testing Personnel are  ASNT-TC-1A qualified.

  • Welding complies with ASME Section IX and NDE with Section V.

Valve Testing, Dedication & Examination
  • Hydrostatic Shell & Seat Leak Testing

  • Material Certifications

  • NDE (MT, PT, RT, VT)

  • Trim Modifications (Non-Cobalt)

  • MOV Conversions

  • 10CFR Part 21 Commercial Grade Dedication Facility

  • 10CFR 50 App B Quality Assurance Program audited by NUPIC

  • ASNT-TC-1A Certified Inspection & Testing Personnel

  • Expedited Deliveries

  • Source Surveillance Services

  • Procurement Augmentation Services

  • Certified Manufacturer’s Outline Drawings

  • CMTR for Pressure Retaining Parts

  • Seismic Certifications

  • Certificate of Conformance

  • Test Reports (Hydro, NDE, PMI)



Sigma Inc. was founded in 1994 by professionals from the power plant and valve industries out of necessity.  The industry needed a thorough, faster and more cost effective alternative to answer critical needs. Sigma Inc. is a major supplier of valves to the power generation industry. Sigma’s primary focus is dedicating commercial grade items for nuclear safety related service, as well as supplying forged and cast valves from our large stock of inventory located in Charlestown, Indiana. We excel in supplying valves with special physical characteristics and documentation requirements. Sigma also supplies other power plant items required to fill an immediate critical need. Sigma has earned a superior reputation for supplying quality power plant components to the power industry for the past 25+ years. Sigma is a Certified Women’s Business Enterprise (WBE).



Edward Valves

Sigma is an authorized stocking distributor of Edward valves and valve repair parts. Sigma can supply Edward small bore forged steel globe and check valves and large bore cast steel gate, globe and check valves. Standard material of construction for forged steel valves are: A105, F11, F22, F91 & F316 and WCB, WC6, WC9 and CF8M for cast steel valves.

Vogt Valves

Sigma is an authorized stocking distributor for Vogt Valves and valve repair parts. Vogt has been manufacturing quality small bore forged steel gate, globe & check valves since 1880. Sigma can supply Vogt valves in a broad range of standard and special configurations for most applications. Standard materials of construction are A105, F11, F22 and F316.

Other Valves

Sigma can supply other valve brands such as Velan, Powell, Crane, Schutte & Koerting, Hancock, Gulf, Aloyco, Techno, Worcester, McCanna, Swagelok, Allis Chalmens and many more. Sigma has over 1,700 N-Stamped valves in stock and available for immediate delivery with the Code Data Package. These products are made available by Sigma through a distribution network that Sigma has developed over the past 22 years.


Year Established


years of serving power plants


years of experience


plants serviced


and more...



Schutte and Keorting Valves safety related

Sigma is actively seeking cooperative business agreements with manufacturers to help facilitate the supply of crucial machinery to the nuclear industry. 


By partnering with valve manufacturer Schutte & Koerting, Sigma has reaffirmed its commitment to providing both commercial grade and safety related products to the nuclear industry seamlessly. 


Sigma invites other manufacturers to start the conversation today.


For any inquiries or questions contact us 24/7 at 1.800.210.6907 or use the form below: 

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Get a quote: 1.800.210.6907

1295 Highway 62

Charlestown, IN 47111

Tel: 800.210.6907

Fax: 812.256.5275

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