Includes Annex F, revised in March 2005.

API Specification 6D is the (proposed) national adoption of ISO 14313: 1999, Petroleum and Natural Gas Industries-Pipeline Transportation Systems-Pipeline Valves. This International Standard specifies requirements and gives recommendations for the design, manufacturing, testing and documentation of ball, check, gate and plug valves for application in pipeline systems.

Valves for pressure ratings exceeding PN 420 (Class 2500) are not covered by this International Standard. Annex A of this Spec 6D provides guidelines to assist the purchaser with valve type selection and specification of specific requirements when ordering valves.