[已解决] 法兰式蝶阀与对夹式蝶阀的区别? 法兰, 蝶阀

转贴员

下面的问题引自http://bbs.hcbbs.com/thread-357807-1-1.html



请教：法兰式蝶阀与对夹式蝶阀的区别？选用的基本原则？

老兵新菜鸟

对夹式蝶阀是用双头螺栓将阀门连接在两管道法兰之间；法兰式蝶阀是阀门上带有法兰，用螺栓将阀门上两端法兰连接在管道法兰上；

个人感觉只是连接方式有不同，作用不会有太大的区别的。

见：http://www.pipingsoft.com/bbs/viewthread.php?tid=984&highlight=%2B%E8%9D%B6%E9%98%80

另：经咨询阀门厂家，对夹蝶阀的法兰是专用的，由厂家提供。

老兵新菜鸟

闸阀 蝶阀 球阀 截止阀 止回阀 的动画视频

http://v.youku.com/v_show/id_XMTI4NDI3MTQ0.html
很直观的

xushhca

Butterfly valve types:

1. lug 2. wafer 3. flange

Wafer and lug style valves are installed “sandwiched” between pipe flanges. Wafer style of valve is easier to replace or install. However, replacing a wafer valve requires the conveying line to be drained. Once the valve is removed, there is nothing to seal material either upstream or downstream from the removal point.
Lug style valves contain tapped holes that allow them to be bolted directly to a mating flange. In the closed position, the valve independently seals material to the upstream and downstream side. Because of this independent sealing, lug valves may be used to isolate downstream equipment that may require replacement or maintenance.
Flange style valves are the similar to other flange valves such as gate valves.
Since flange style body is longer, it can be installed the place where the room is enough, for example, the locations close to elbow or reducer. The disc cannot be blocked by wall.
Lug and wafer styles are installed in the crowded segments and save room, or lower the height. But since the body length is very small, while the disc is large, the disc can be intervened by elbows, or other fittings when open.

High Performance -- Double Offset Butterfly Valve
This type of butterfly valve is ideal for applications involving higher temperatures (up to 1200º F) and higher pressures (up to 1440 psig). The disc and stem are double offset, causing the disc to “cam” into place upon closure.
High Performance -- Triple Offset Butterfly Valve
This type of butterfly valve is often used in refinery and off shore applications where more extreme conditions exist. Most triple offsets utilize a metal on metal seat and disc closure, are rated up to 600# class, and are fire safe.
The double and triple offset butterfly valves are specialized valves for extreme applications.

Sometimes butterfly valve is an alternative valve used in transient flow to reduce pressure surge.

llljq

回复 4# xushhca

详述了LUG（凸耳式）、WAFER（对夹式）和FLANGE（法兰式）蝶阀的区别，以及双偏心蝶阀和三偏心蝶阀的应用场合等信息。
非常感谢！

转贴员

wafer是对夹连接，lug也是对夹连接但阀上有支耳定位(开孔带螺纹)。




http://www.sealmech.com/Valves/john%20valve/3_butterfly.pdf