【球阀】外形 结构图
球阀，标准GB/T21465-2008《阀门术语》中定义为：启闭件（球体）由阀杆带动，并绕阀杆的轴线作旋转运动的阀门。球阀分为浮动球式和固定球式。球阀一般用于快速启闭或要求阻力小的场合。球阀不用作节流使用，因为节流可能造成密封件或球体损坏。1. 浮动球式
2. 固定球式
http://www.youqichuyun.com/xwb/images/bgimg/icon_logo.png 该贴已经同步到 helloshigy的微博
Materials
No. Part Material
1 Body M40HTi2 ISO Zinc plated carbon steel ASTM A216 WCB
M40HTi3 ISO Stainless steel ASTM A351 CF8M
M40HTi2 ISO Zinc plated carbon steel SAE 1040
2 Insert
M40HTi3 ISO Stainless steel AISI 316
3 Ball Stainless steel AISI 316 hardened surface
4 Stem Stainless steel AISI 316 / AISI 420
5 Seats PEEK Virgin
6 Insert gasket Graphite
7 Seat 'O' ring EPDM Geothermal
8 Stem seals Graphite
9 Stem seals PEEK Virgin
10 Stem seals Stainless steel AISI 304
13 Separator Zinc plated carbon steel SAE 1010
14 Belleville washer Stainless steel AISI 301
15 Gland nut Zinc plated carbon steel SAE 1010 / SAE 12L14
16 Upper stem nut Zinc plated carbon steel SAE 1010 / SAE 12L14
17 Locking plate Stainless steel AISI 304
18 Name-plate Stainless steel AISI 430
20 Lever Zinc plated carbon steel SAE 1010
21 Grip Vinyl
25 Stop screw Zinc plated carbon steel SAE 12L14
26 Split lock washer Stainless steel AISI 304
In addition, there are different styles related to the bore of the ball mechanism itself:
[*]A full port or more commonly known full bore ball valve has an over-sized ball so that the hole in the ball is the same size as the pipeline resulting in lower friction loss. Flow is unrestricted but the valve is larger and more expensive so this is only used where free flow is required, for example in pipelines which require pigging.
[*]In reduced port or more commonly known reduced bore ball valves, flow through the valve is one pipe size smaller than the valve's pipe size resulting in flow area being smaller than pipe. As the flow discharge remains constant and is equal to area of flow (A) times velocity (V), http://upload.wikimedia.org/math/9/3/0/930e6b5fa8c39786e4a7dcb162a83ce8.png the velocity increases with reduced area of flow.
阀门又可分为：通径球阀和缩径球阀。以上阀门都是通径的。
这个是缩径的：
There are a few types of ball valves related to the attachment and lateral movement of the ball:
A trunnion ball valve has additional mechanical anchoring of the ball at the top and the bottom, suitable for larger and higher pressure valves (say, above 10 cm and 40 bars).
A floating ball valve is one where the ball is not held in place by a trunnion. In normal operation, this will cause the ball to float downstream slightly. This causes the seating mechanism to compress under the ball pressing against it. Furthermore, in some types, in the event of some force causing the seat mechanism to dissipate (such as extreme heat from fire outside the valve), the ball will float all the way to metal body which is designed to seal against the ball providing a somewhat failsafe design. 楼主6666666666666666 恩，很有知识
竟然如此详细、
竟然如此详细、{:4_88:} 非常不错的分享 学习了，谢谢楼主分享
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