Orbit non - friction ball valve is a new type of valve and realizes non - friction switching and metal pressurization of the valve by cam mechanism . this paper researches the design of orbit non - friction ball valve mechanism and its computer aided design . the main work and the result are as follows : the author puts forward the kinetic analysis method of orbit non - friction ball valve , analyses the track and motion space of the conglobulation for switching etc , and brings forward rule of its configuration design , designs its assembling body and all the part 本论文对轨道式无摩擦球阀机构设计及计算机辅助设计系统进行了研究，取得了以下几方面的成果：提出了轨道式无摩擦球阀的运动和动力分析方法，完成了球阀启闭运动轨迹、球体运动空间以及主要零部件的受力等分析，进一步提出了球阀结构设计的准则，完成了球阀装配件及所有零部件图的设计。
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