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Who is MSS?

Officially founded in 1924, the Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for:

  • Valves
  • Valve Actuators
  • Valve Modification
  • Pipe Fittings
  • Pipe Hangers
  • Pipe Supports
  • Flanges
  • Associated Seals

MSS Valve and Fitting Standards are in use around the world in a wide variety of facilities, including Nuclear Power Plants, and in virtually every industry, from Waste Water to Oil Refining. MSS currently includes 110 Member Companies that work in 26 Technical Committees to develop and maintain standards that shape the way flow is controlled. MSS is an American National Standards Institute (ANSI)-accredited standards developer.

ANSI Accreditation
As part of the American National Standards process, ANSI accredits the due process-based procedures of MSS, in addition, ANSI accreditation signifies that the procedures used by MSS meet the Institute's requirements for consensus, openness, balance, and due process.

The primary function of MSS is to provide its members the means to develop engineering standard practices for the use and benefit of the industry and users of its products. The Society, the only organization dedicated solely to the technical needs of the industry, is currently comprised of 26 technical committees to write, revise and reaffirm industry standards.

In its leadership role, the Society also contributes to and monitors code and standard development activities worldwide. MSS, in cooperation with other standardizing bodies, appoints representatives to other standardization organization committees to share the views and objectives of the Society.

Standards organizations in which MSS currently participates include, but are not limited to, the American Society of Mechanical Engineers (ASME), American National Standards Institute (ANSI), American Society for Testing and Materials ASTM), American Petroleum Institute (API), American Waterworks Association (AWWA) and the National Fire Protection Association (NFPA).

At the international level, MSS representatives have served as leaders in U.S. delegations in many of the meetings of ISO working groups, subcommittees, and main committees addressing applicable areas of interest.

MSS Logo Creation, Mr. Bob Koester of The William Powell Company, a Charter Member company, is the engineer who designed and created a cast for the first metal logos that hang in the MSS Office.


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October 25, 2020

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