Analysis of fatigue reliability for high temperature and high pressure multi-stage decompression control valve

2017 International Symposium on Application of Materials Science and Energy Materials

材料科学;能源学

Yu, Long^1,2 ; Xu, Juanjuan^1,2 ; Zhang, Lifang^1,2 ; Xu, Xiaogang^1,2

School of Petro. ENG, Lanzhou University of Technology, Lanzhou, China^1

Machinery Industry Pump and Special Valve ENG Research, Lanzhou, China^2

关键词: Control valve models;    Fatigue sensitivity;    High temperature and high pressure;    Stress-strength interference theories;    Technical requirement;    Temperature correction;    Temperature correction factor;    Theoretical calculations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/322/4/042020/pdf
DOI  :  10.1088/1757-899X/322/4/042020

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Based on stress-strength interference theory to establish the reliability mathematical model for high temperature and high pressure multi-stage decompression control valve (HMDCV), and introduced to the temperature correction coefficient for revising material fatigue limit at high temperature. Reliability of key dangerous components and fatigue sensitivity curve of each component are calculated and analyzed by the means, which are analyzed the fatigue life of control valve and combined with reliability theory of control valve model. The impact proportion of each component on the control valve system fatigue failure was obtained. The results is shown that temperature correction factor makes the theoretical calculations of reliability more accurate, prediction life expectancy of main pressure parts accords with the technical requirements, and valve body and the sleeve have obvious influence on control system reliability, the stress concentration in key part of control valve can be reduced in the design process by improving structure.