【球閥】外形 結構圖

helloshigy

球閥，標準GB/T21465-2008《閥門術語》中定義為：啟閉件（球體）由閥桿帶動，并繞閥桿的軸線作旋轉運動的閥門。球閥分為浮動球式和固定球式。球閥一般用于快速啟閉或要求阻力小的場合。球閥不用作節流使用，因為節流可能造成密封件或球體損壞。
1. 浮動球式


2. 固定球式



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中石油建設hy

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.

中石油建設hy

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

中石油建設hy

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), the velocity increases with reduced area of flow.
  

閥門又可分為：通徑球閥和縮徑球閥。以上閥門都是通徑的。

這個是縮徑的：

Zx。

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設計初學者

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史斌

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chengcheng00166

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qinghua1982

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