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This International Standard specifies requirements and gives recommendations for the design, manufacturing, testing and documentation of ball, check and gate valves for subsea application in offshore pipeline systems meeting the requirements of ISO 13623 for the petroleum and natural gas industries. This International Standard is not applicable to valves for pressure ratings exceeding PN 420 (Class 2500). Annex A of this International Standard provides guidelines to assist the purchaser with valve type selection and specification of requirements when ordering valves. Annex B of this International Standard provides a checklist summary of information to be provided by the manufacturer and/or purchaser when ordering valves.