API 6D Specification for Valves, Twenty-Fifth Edition, Includes Errata 1 (2021), Errata 2 (2022), Errata 3 (2023), Addendum 1 (2023), Addendum 2 (2024), and Addendum 3 (2025)

API 6D specifies pipeline and piping valves. Twenty-Fifth Edition, American Petroleum Institute, with all current errata and addenda through 2025.