Full
Outline
To address the threats of internal leakage in high‑pressure gate valves to equipment safety and system energy efficiency optimization，research on quantitative detection and condition diagnosis of internal leakage was carried out.An internal leakage test platform for high‑pressure gate valves was established，and ultrasonic testing technology was used to conduct internal leakage tests under various combined conditions involving two media （liquid/gas），inlet pressure from 10~70 MPa，defect sizes from 0.1~0.3 mm，and valve diameters from DN65~DN130.The results show that as inlet pressure and defect size increase，both the internal leakage flow rate and the ultrasonic signal of liquid/gate valves show an increasing trend；as valve diameter increases，both decrease，a phenomenon mainly influenced by wall thickness.Under the same conditions，the gas internal leakage flow rate is approximately 10~431 times that of liquid.The gas ultrasonic signal is generally stronger than that of liquid，with signal amplitude approximately 1.4~3.2 times that of liquid；during internal leakage in liquid/gas gate valves，the outlet ultrasonic signal is generally stronger than the inlet signal，with an average difference maintained at 7.2 dBμV RMS.Based on the Gaussian process regression （GPR） method，using the Matern 5/2 kernel function （length scale of 1，signal variance of 0.707 1），an internal leakage flow rate prediction model was constructed，achieving a prediction accuracy of 93.55%.The obtained laws and the model have good universality，providing reliable application basis and theoretical support for the quantitative assessment and operating condition diagnosis of internal leakage in high‑pressure gate valves under different working conditions.
118
47
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
