1、PNPN4 40 0、DN500DN500 固定球固定球软密封软密封管线球阀设计管线球阀设计 摘摘 要要 球阀已成为长输管线阀门中的首要选择。球阀是以球体作为关闭件的主要切断类阀门。全通径球阀具有流体阻力小, 节省能源,流向不受限制, 启闭快等优点。其综合技术性能比相同用途的截止阀、旋塞阀和蝶阀均优越。本设计重点介绍 了球阀中最常用的一种固定球软密封管线球阀的设计过程和内容。设计过程主要包括：设计计算、结构设计、主要 零部件的强度校核。根据任务书的要求，参考国际、国内现有球阀的结构，设计完成了球阀中阀体、侧阀体、阀盖、阀 杆、球体、密封弹簧、防静电装置和驱动装置等主要零部件的设计。针对本设计中
2、阀杆强度的校核进行了计算机编程， 翻译了相关文献资料，完成了相关课题的论文一篇。本设计可为固定球软密封球阀的设计提供一定的参考。 关键词：关键词：管线球阀; 设计; 弹性密封;固定球球阀 Abstract Ball valve has become the primary choice of the long-distance pipeline.It is the major closure types of valves to cut off as ball. Full bore perforation ball valve has the advantages of small flow
3、resistance, saving energy， Unrestricted flow, fast hoist and so on. It has excellent technical performance than stop valves, plug valves and butterfly valves. This project introduces the design process and the content of the soft-sealing type of fixed ball pipelines ball valve were introduced, which
4、 is the most commonly used one. The design process mainly included design and calculation, structural design, main spare part strength examination. According to the requirements in the task of the design, referenced to the structure of the international and internal existing ball valves, and completed the design of the intermediate body, the Side body, bonnet , stem, ball, sealing spring，electrostatic prevention device, drive actuator and main spare parts. Aiming at the stems strength exami
