With the continuous development of national economy, water and electricity, petrochemical and other industries for high efficiency and low cost increasing need of stainless steel ball valve, but also has higher requirement on the performance of the stainless steel ball valve. For stainless steel ball valve structure optimization can only rely on for many years engineering experience, due to the complexity of stainless steel ball valve structure, produce stress concentration and deformation not harmonious, thus reducing the service life of the stainless steel ball valves and leakage. Research the content of the stainless steel ball valve as follows: 1. Stainless steel ball valve body structure finite element analysis model is established, the analysis of valve and valve body structure strength and deformation, got the size and distribution of the equivalent stress of valve and valve body, and then find out the weak links of the structure. 2. To the quality of the stainless steel ball valve body, stiffness as constraint condition, maximum stress, maximum displacement as the objective function, with stainless steel ball Industrial Valves body basic dimensions as design variables, combined with sensitivity analysis and Pareto multi-objective optimization, obtained the reasonable structure of stiffener size and position, improve the ball valve of the whole stress distribution, the distribution is more homogeneous, improve the whole structure of ball Industrial Valves safety and economy. 3. Stainless steel ball valve body structure of the improved reliability analysis, for life, damage, and safety coefficient of reliability parameters, find out prone to fatigue failure of the parts, and to evaluate the safety of the large diameter ball valve, the results show that the improved valve and Industrial Valves body under pressure from work is safe and reliable, meet the design requirements.
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