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Quick-Opening Closure is a critical quick-opening component in pressure vessels and piping systems, requiring strict adherence to standards in machining accuracy, quality, pressure resistance, structural strength and safety. Its manufacturing involves six core processes: design and process finalization based on operating parameters, qualified raw material cutting and rough forming, high-precision finishing of key surfaces, qualified welding with non-destructive testing and stress-relief heat treatment, assembly and safety interlock testing, and pressure testing with final inspection and marking. Key quality control focuses on certified raw materials, defect-free sealing surfaces with required accuracy, mandatory dual safety interlocks, and full compliance with ASME and other standards with complete traceable documents. Used in petroleum pipelines, it demands tight manufacturing tolerances, and manufacturers must also meet customer quality and warranty requirements.