API Spec 6D: 2008 Specification for Pipeline Valves. ISO 14313: 2007 (Identical)

An American National Standard. American Petroleum Institute (API). Twenty-Third Edition , April 2008. Addendum 2, August 2011. 106p. This Standard specifies requirements and provides recommendations for the design, manufacturing, testing and documentation of ball, check, gate and plug valves for application in pipeline systems meeting the requirements of ISO 13623 for the petroleum and natural gas industries.
This Standard is not applicable to subsea pipeline valves, as they are covered by a separate International Standard (ISO 14723).