Manufacturers Standardization Society (MSS)
The MSS of the Valve and Fittings Industry is organized for development of industry, national and international standards for:
- Valves
- Valve Actuators
- Pipe Fittings
- Valve Modification
- Flanges
- Pipe Hangers
- Associated Seals
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MSS SP 125 – Gray Iron and Ductile Iron In-Line: 2018 [paper]
Gray Iron and Ductile Iron In-Line, Spring-Loaded, Center-Guided Check Valves
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MSS SP 25 – Standard Marking System for Valves: 2018 [paper]
MSS SP-25 Standard Marking System for Valves, Fittings, Flanges, and Unions
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MSS SP 42: 2013 [paper]
Corrosion resistant gate, globe, angle and check valves with flanged and butt weld ends
(classes 150,300 & 500)Quick View -
MSS SP 43: 2013 [paper]
Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications.
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MSS SP 44: 2016 [paper]
Steel Pipeline Flanges
Includes all amendments and changes through Reissue Notice , September 2017
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MSS SP 55: 2011 [paper]
Quality Standard for Steel Castings for Valves, Flanges, Fittings and Other Piping Components – Visual Method for Evaluation of Surface Irregularities.
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MSS SP 58 – Pipe Hangers and Supports: 2018
Pipe Hangers and Supports – Materials, Design, Manufacture, Selection, Application, and Installation, 2018 Edition
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MSS SP 58: 2009 [paper]
Pipe hangers and supports – materials, design, and manufacture, selection, application, and installation.
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MSS SP 6: 2017 [paper]
MSS SP 6- Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings
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