Acoustic Emission Valve Disc Slight Opening Recognition Technology

Currently, there is no universally recognized valve disc slight opening identification technology for online verification in safety valves. For spring-loaded safety valves, there is no online verification method available when the mid-range value is unknown. Particularly in the online verification of spring-loaded safety valves, the existing methods generally suffer from the drawback of poor verification accuracy. This paper proposes a novel approach, centered around a computer system, comprising an acoustic emission sensor, a signal amplifier, a valve stem lifting device, and an additional acoustic emission sensor. The signals indicating the slight opening of the safety valve disc are collected by the acoustic emission sensors, and the extracted features of these signals are subsequently analyzed for identification purposes. This method exhibits high accuracy and generalizability, thereby enhancing the accuracy of online verification results for safety valve disc slight opening. The experimental setup complies with the "TSG-ZF001-2006" (Regulations for Safety Technical Supervision of Safety Valves), and the experimental apparatus demonstrates an error rate below 2% compared to the offline calibration bench, outperforming other methods with 5%-10% higher accuracy than safety valve online verification devices. This approach holds significant potential for widespread adoption within the industry, aligning with SCI (Science Citation Index) standards.