摘要本次设计的球阀为液体介质，其结构为上装式两片浮动球球阀。其结构内容包括球体、左阀体、右阀体、阀杆、阀座、扳手、密封圈等。在设计球阀时，应进行下列内容的计算：阀体最小壁厚；设计比压和实际比压的计算；球体最小直径的计算；阀杆端部的强度校核；中法兰连接螺栓强度校验；以及其他主要零件的设计与计算。阀体材料为WCB，所以为钢制球阀，密封材料选用聚四氟乙烯（PTFE）。零件的设计均按照国家标准，其结构长度亦参照国家标准，因此能够互相替换。63220

关键词  浮动球阀  最小壁厚  密封面比压   密封材料   结构长度

毕业设计说明书（毕业论文）外文摘要

Title       The design of liquid medium ball valve                     

Abstract Depending on liquid medium, the ball valve structure consists of two floating ball valves, which can load from above. The ball valve structure includes sphere, left body, right body, valve stem, valve seat, wrench, seal ring and so on. When designing the ball valve, the following things should be calculated, such as strength check of the valve stem end, strength check of the flange joint bolt, the design and calculate of other major parts. This is a steel ball valve due to the material WCB. Sealing material selects PTFE. Parts of the design are in accordance with national standards. In addition, length of the structure is also reference to national standards, so it is possible to replace each other.

Keywords  Float ball valves  Minimum wall thickness  The sealing surface pressure Sealing material  Structure length

1  绪论 1

1. 1  前言 1

1．2  研究背景 1

1. 3  国内现状 1

1. 3  国外现状 1

2  阀门概述 3

2. 1  阀门的公称尺寸 3

2. 2  公称压力 3

2. 3  阀门的型号编制 3

2. 4  阀门的标志和标记方法 4

2.4.1  标志的内容 4

2.4.2  标志的标记方法 4

2.4.3  标志的标记式样 4

2.4.4  标志的标记位置 4

2. 5  涂漆 5

2.5.1  阀门的涂漆 5

2.5.2  铜合金材质阀门 5

2.5.3  耐酸钢、不锈钢材质阀门 5

2.5.4  阀门驱动装置 5

3  球阀的用途及分类 6

3. 1  球阀的特点及用途 6

3. 2  球阀的分类 7

3.2.1  浮动球球阀 7

3.2.2  固定球球阀 7

3.2.3  弹性球球阀 7

3.2.4  双联球阀 7

3.2.5  V形球球阀 7

3.2.6  升降杆式球阀 8

3.2.7  金属密封半球阀 液体介质球阀的设计:http://www.youerw.com/jixie/lunwen_69635.html