Experienced, Specialized, and Serving The Nuclear Power Industry for Over 25 Years

NWS specializes in the testing, certification, and repair of valves for the nuclear power industry. We are committed to maintaining a highly skilled workforce and dedicating the necessary resources to surpass customer requirements and expectations. All safety-related work is performed in accordance with the NWS Quality Assurance Program which has been approved for use by nuclear utilities worldwide.

We service Class I, II, III, and Balance of Plant relief valves. Our expertise ensures valve repair and testing is fully compliant with industry codes and standards. No other company has the breadth and level of expertise NWS provides.

NWS provides complete repair services for all safety and relief valves used in nuclear power generation including the following:


  • Pressurizer Safety Valves
  • Main Steam Safety Valves
  • Main Steam Safety Relief Valves
  • Cross Around Relief Valves
  • Class II/III and Balance of Plant Relief Valves

GE-Consolidated / Dresser

  • Pressurizer Safety Valves
  • Main Steam Safety Valves
  • Electomatic Relief and Pilot Operated Relief Valves​
  • Class II/III and Balance of Plant Relief Valves

Target Rock

  • Pilot Operated Two and Three Stage Main Steam Safety Relief Valves (Safety Relief Valves)
  • Pressurizer Safety Valves
  • Pilot Operated Relief Valves
  • Class II/III and Balance of Plant Relief Valves


  • Main Steam Safety Relief Valves​


  • Broad range of Class II/III, and balance of plant air/nitrogen/gas/oil/liquid/steam valves by all other OEMs

How we can serve you best

Our highly trained staff repairs valves to meet OEM specifications and all code and quality requirements. Annually, we repair hundreds of valves backed by our guarantee that if any valve fails a test due to our workmanship, it will be repaired and re-tested at no additional cost. Together, we work with our customers in order to resolve any issues while providing the highest quality services including repairs, restoration, welding, and more.

How we serve you:
We’ve invested in the robust data acquisition hardware and software to provide the highest accuracy of testing available.
Our proprietary test data analysis software is developed in-house and is backed with over twenty-five years of experience.
We provide fast turnaround times with the ability to service on weekends and off-shifts.
Testing & Certification

NWS’s broad test program covers an extensive array of air, water, and steam valves. We would love to work with you to develop a benchmark test procedure.

Repair & Refurbishment

NWS’s repair and refurbishment procedures ensure all components, inspection points, and assembly techniques are in line with industry best practices and OEM requirements.

Program Development

Utilizing our extensive library of test and repair procedures and protocols, NWS will work with you to generate a cost-effective repair and test program tailored to your unique valves, plant technical requirements, and objectives.

Technical Support & Field Services

NWS offers industry and code expertise as well as field services including valve program oversight, troubleshooting, installation, and repair and certification services. We also support custom projects upon request.


We provide temperature-controlled, locked, and monitored storage that meets the requirements of NQA-1 Subpart 2.2. We offer secure, Quality Assurance controlled parts storage in our warehouse.

Don’t see your valve listed?

Contact us to discuss your specific requirements.