MSS Standards for individual purchase

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  • Gray Iron Plug Valves, Flanged and Threaded Ends

    Standard [CURRENT] 2026

    MSS SP-78:2026

    Gray Iron Plug Valves, Flanged and Threaded Ends

    This Standard Practice covers: a) Gray iron plug valves with flanged or threaded ends; b) Valves in sizes and pressure-temperature ratings specified herein for general purpose service; c) Includes ...

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  • Testing of Valves for Cryogenic Hydrogen Service

    Standard [CURRENT] 2026

    MSS SP-166:2026

    Testing of Valves for Cryogenic Hydrogen Service

    This Standard Practice applies to type testing and production testing of valves.

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  • Steel Pipeline Flanges

    Standard [CURRENT] 2026

    MSS SP-44:2026

    Steel Pipeline Flanges

    This Standard Practice covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for steel pipeline flanges. The welding neck type flanges shall be forged steel ...

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  • Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications

    Standard [CURRENT] 2026

    MSS SP-43:2026

    Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications

    This Standard Practice provides requirements for wrought and fabricated butt-welding fittings intended for low pressure, corrosion resistant applications. The requirements covered include pressure ...

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  • Non-Ferrous Threaded and Solder-Joint Unions for Use with Copper Water Tube

    Standard [CURRENT] 2026

    MSS SP-123:2026

    Non-Ferrous Threaded and Solder-Joint Unions for Use with Copper Water Tube

    This Standard Practice covers copper and copper alloy unions with metal-to-metal seating, in nominal sizes 1/4 through 4, with solder-joint or threaded end connections, and for use with copper ...

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  • Corrosion-Resistant Gate, Globe, Angle, and Check Valves with Flanged and Butt Weld Ends (Classes 150, 300, and 600)

    Standard [CURRENT] 2026

    MSS SP-42:2026

    Corrosion-Resistant Gate, Globe, Angle, and Check Valves with Flanged and Butt Weld Ends (Classes 150, 300, and 600)

    This Standard Practice covers Classes 150, 300, and 600 corrosion-resistant alloy gate, globe, angle, and check valves with flanged and butt weld ends which are constructed of pressure-containing ...

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  • Ductile Iron, Metal-Seated, Non-Lubricated, Eccentric Plug Valves

    Standard [CURRENT] 2026

    MSS SP-156:2026

    Ductile Iron, Metal-Seated, Non-Lubricated, Eccentric Plug Valves

    This Standard Practice involves: a) Requirements for ductile iron, metal-seated, non-lubricated, eccentric plug valves with flanged, mechanical joint, grooved, or shouldered ends. b) Applicable ...

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  • Guidelines for Manual Operation of Valves

    Standard [CURRENT] 2025

    MSS SP-91:2025

    Guidelines for Manual Operation of Valves

    The purpose of this Standard Practice is to provide valve users with information for use in evaluating the manual operation of valves. This Standard Practice provides guidelines for the operation ...

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  • Metallic Manually Operated Fuel Gas Distribution Valves

    Standard [CURRENT] 2025

    MSS SP-131:2025

    Metallic Manually Operated Fuel Gas Distribution Valves

    This Standard Practice covers Metallic Fuel Gas Distribution Valves designed for operation at a maximum of 285 psig, at operating temperatures ranging from -20 °F to 150 °F, and sizes from NPS 1/2 ...

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  • Design Requirements for Actuator-to-Valve Mounting Components

    Standard [CURRENT] 2025

    MSS SP-162:2025

    Design Requirements for Actuator-to-Valve Mounting Components

    This Standard Practice provides requirements for actuator to valve mounting components, including design constraints, allowable stresses, marking, and performance criteria.

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