中文摘要：

针对钻井泵阀的冲击疲劳破坏，重点研究了泵阀冲击时产生最大应力集中部位的受力特征及其影响程度，提出了基于应力集中影响的钻井泵阀无冲击工作条件。该条件完善了泵阀运动特性的描述，考虑了应力集中在交变应力作用下对加速泵阀失效所带来的危害性，将无冲击条件应用于泵阀设计，对延长泵阀的使用寿命有一定的指导意义。

英文摘要：

According to the impact fatigue failure appeared in drilling pump valve, the mechanical characteristic and effect degree of the maximum stress concentration spot when the impact of pump valve happens were mainly studied, hence a non-impact working condition of drilling pump valve based on the effects of stress concentration was put forward. In this non-impact working condition, the description of pump valve＇s motion characteristic was perfected, and the harmfulness of accelerating pump valve＇s failure by stress concentration under alternating stress was considered. Therefore, in design of the pump valve, the application of the non-impact working con dition was beneficial to extend the service I.ife of pump valve.