Norriseal-WellMark has been a leading supplier of valve and control solutions for more than six decades. From the beginning, we have fostered a culture focused on excellent customer service, invested in our people and our technologies, and created a business rooted in continuous improvement. In short, we’re an organization driven to help you be your best.

About Norriseal-WellMark

Renowned for innovative design and precision manufacturing, our products are used worldwide in a range of industries, including oil and gas production and transmission, refining, petrochemical/chemical processing, marine, power generation, pulp and paper, food and beverage, high-pressure HVAC, steel manufacturing, and other applications.

We market and support our products through a global network of representatives and customer service teams.
(See Locations and Representatives)

Norriseal-WellMark is part of Dover Corporation, a global manufacturer of industrial products with over $7 billion in sales. Dover is a Fortune 500 company listed on the NYSE under the symbol “DOV.”

Engineered Performance for Extended Value

From your initial consultation and application analysis through the exceptional service life of our products, Norriseal-WellMark delivers extended value. We support you all along the way with aftermarket training, phone support, factory and field support, as well as expert problem-solving.

  • Consultative customer service
  • In-house engineering and technical support
  • Industry-best warranty
  • In-depth applications experience
  • Award-winning innovation and ongoing product development
  • ISO 9001:2008 certified manufacturing
  • More than 60 years of experience and industry service
  • Compliance with all industry standards and specifications
  • Responsive service and prompt delivery

Best-In-Class Quality

Norriseal-WellMark is certified to ISO 9001:2008 standards for welding, tolerances, inspection and testing procedures as stated in our Quality Assurance Manual. This certification signifies our commitment to the highest quality standards and dedication to continuous improvement in products and customer support.


Engineering resources are key to our award-winning product innovation and ongoing customer satisfaction. Extensive in-house engineering and technical support services enable us to develop optimal solutions for your needs – both through new product development and through custom-tailoring existing products to meet specific job requirements.

Norriseal-WellMark engineers are highly skilled and have years of in-depth applications experience. For your most challenging problems – or most routine questions – contact us. We’ll provide the technical support you need.


The Norriseal-WellMark manufacturing facility is located on a 10-acre site in northwest Houston, TX (USA). The facility consists of a 62,500 square-foot office building and modern manufacturing plant equipped with the latest automated machinery and staffed by highly experienced personnel.

We manufacture to the most up-to-date design criteria and requirements of ANSI B16.34. In addition, we are certified to ISO 9001:2008 and meet the quality assurance standards for welding, tolerances, inspection and testing procedures as stated in the Norriseal-WellMark Quality Assurance Manual.




The Norriseal-WellMark brand is introduced as the company transitions with a broader product portfolio, more cohesive new product development, enhanced service and support and greater efficiencies.


Norriseal partners with Siemens to deliver the Series 8900 SmartPredictor electropneumatic positioner.


Norriseal acquires Wellmark to expand its portfolio of regulators, relief valves, chemical injection pumps, control valves and instrumentation.


Norriseal introduces the Series 1200 magnetic liquid level gauge as an accurate, low-maintenance alternative to sight glasses.


Norriseal receives ISO 9001-2008 accreditation.


The Norris butterfly product line is moved to the Norriseal Houston manufacturing facility, creating the current Norriseal company.


The Norriseal facility in Houston is enlarged to 62,500 square feet.


Norriseal receives the “Meritorious Award for Engineering Innovation” from Petroleum Engineer Magazine for the Series 7100 Non-Slam Piston design.


Norriseal provides all the valves and controls used on the Thistle Platform located off the coast 1979 at Aberdeen, Scotland in the North Sea.


Norriseal releases the Series 7100 Flo-Lift® Piston Check Valve, which incorporates the body and trim components of the Series 2700 with the Non-Slam Piston and Bonnet Closure.


The Series 1001A Liquid Level Controller is introduced with enhancements like a sealed case and cover, rugged internals for vibration application, and a special material for marine environments.


Norriseal receives the “Meritorious Award for Engineering Innovation” from Petroleum Engineer Magazine in 1971 for the Series 2700 Balanced Plug Trim design.


The Series 2700 Control Valve is released with its Bolted Bonnet Closure and Balanced Characterized Valve Plug.


The Series 2200/2200 High-Performance Control Valve is released, featuring the Hammer Nut Bonnet Closure.


The Series 1000 Liquid Level Controller is redesigned and introduced as the Series 1001. Today, this product continues to incorporate the patented No-Bleed Pilot feature.


Dover acquires Parks Equipment Company under its Norris business unit and rebrands the merged entities as the Norriseal Controls Division.


Asbury Parks starts the Parks Equipment Company in his garage.