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Introduction API 599, published by the American Petroleum Institute (API), is a widely recognized standard for the design, construction, testing, and performance requirements of plug valves, particularly for the oil, gas, and petrochemical industries. This standard ensures the reliability, safety, and operational efficiency of plug valves in various critical applications, such as controlling the flow of fluids and gases under high pressures and temperatures. Plug valves are essential in numerous processes due to their ability to provide a tight seal, simple operation, and effective flow regulation.