Research on the stability of single axial electric ball valve the bearing capacity of the electric ball valve of single axial electric ball valve is limited by the critical pressure of instability. Pipe instability can be divided into column instability, plane instability and torsional instability. The research involves material nonlinearity, geometric nonlinearity and other conditions. The finite element method is widely adopted as an important means of research.
In the research of instability mechanism and instability force characteristics, Chunsheng, et al. discussed the test method of electric ball valve plane instability. Experiments show that when the pipe is in the compression displacement state, the plane instability pressure is significantly lower than the plane instability pressure under the zero displacement condition; when the pipe is in the tension state, the plane instability pressure is significantly higher than the plane instability pressure under the zero displacement condition. Guo Ping used ANSYS to simulate the instability of the pipe string in the engineering case. The plane instability problem is compared with the calculation of the pipe instability limit internal pressure formula in EJMA, and it is pointed out that the two instability mechanisms are the same. The final instability of the electric ball valve depends on the parameters. Zhang Wangtian's circumferential stability under the condition of tensile displacement of thin-walled corrugated tubes.
In the study, it is concluded that the circumferential instability of the electric ball valve is the result of the commonality of the excessive radial shrinkage of the wave crest and the large circumferential pressure stress: under certain pressure, the circumferential instability of external pressure can be effectively prevented by limiting the tensile displacement of the electric ball valve.