API Std 598, Valve Inspection and Testing, is a standard developed and published by the American Petroleum Institute (API) that covers inspection, examination, supplementary examinations, and pressure test requirements for resilient-seated, nonmetallic-seated (e.g., ceramic), and metal-to-metal-seated valves of the gate, globe, plug, ball, check, and butterfly types. This standard supplements the API standards that reference it, but it may also be applied to other types of valves by agreement between the purchaser and the valve manufacturer. API 598 was originally released in 1993, with the most recent 11th Edition being published in February of 2023.
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- International Organization for Standardization (ISO)
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