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为保证天然气长输管线全焊接锻造球阀在地基沉降、山体滑坡等实际可能工况下有足够强度和良好密封性能,基于有力矩理论和弯曲应力理论,从强度和密封角度对全焊接锻造球阀可承受最大弯曲载荷进行理论分析计算和数值模拟实验,得到全焊接锻造球阀同时满足强度与密封性能的最大弯曲载荷;通过分析理论载荷值与临界载荷值得到修正系数C,求出全焊接锻造球阀在任意公称压力和直径下可承受最大弯曲载荷.研究表明:在保证强度有效的最大弯曲载荷下,球阀密封性能依然有效;修正系数的引入弥补了理论计算无法考虑结构突变、应力集中、几何非线性等因素引起的不足;研究方法弥补了国内无法进行全焊接锻造球阀抗弯性能评估型式试验的不足.
In order to ensure that the fully welded forged ball valve of natural gas long-distance pipeline can have sufficient strength and good sealing performance under actual conditions such as foundation settlement and landslide, based on the theory of moment and bending stress, The maximum bending load is subjected to theoretical analysis and numerical simulation experiments to obtain the maximum bending load of fully welded forged ball valve while satisfying the strength and sealing performance. By analyzing the theoretical load value and the critical load value, the correction coefficient C is obtained, The maximum bending load can be obtained under any nominal pressure and diameter.The results show that the sealing performance of the ball valve is still effective under the maximum bending load with guaranteed strength and strength.The introduction of the correction factor makes up the theoretical calculation can not consider the structural mutation, stress concentration, geometric nonlinearity And other factors caused by the lack of research methods to make up for the domestic can not be welded forging ball valve bending performance evaluation of the lack of type test.