Standard butterfly head
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For a standard butterfly head, Ri is taken as 0.9Di and r as 0.17Di. It is still Ri=Di, with r=0.1Di. In the lecture slides provided by our teacher, it is stated that for standard butterfly heads, Ri=0.9Di and r=0.17Di; however, according to GBT25198-2010, for THA and THB types, Ri=Di and r=0.1Di are used. I just don’t know if it’s standard.
Is there a definition for a standard butterfly head?
Reply to 2# SuperFree2316: I searched for it for a long time without finding it; I finally saw it in the teacher’s lecture materials, where it was mentioned as seeking the wall thickness of a standard butterfly head. . That’s the one being used. .
There really is nothing like that; GB150 merely specifies Ri=0.9Di and r=0.17Di, and it allows for a slightly greater minimum thickness when calculating the internal pressure due to elastic instability. Not bad; you have a spirit of exploration. I didn’t even think about such things during my senior year
This post was last edited by SuperFree2316 on 2011-4-15 at 18:30. To be honest, after graduating, there are things from school that one needs to let go of. You’re far better than me~ When I graduated from university, I didn’t even know what a end cap or a flange was
:Curse: They’re all powerful people; I don’t know anything. It’s been almost two years since I graduated.
Standards exist to achieve standardization; for example, in the case of conical end caps, the standards specify only three common angles: 30, 45, and 60 degrees. Is there anything wrong with using a 40-degree angle? As long as you can calculate and verify it, that’s enough.
Ri=0.9Di, r=0.17Di – this is very close to a standard 2:1 ellipse
The traditional manual approximation method for designing standard elliptical heads was based on Ri=0.9Di and r=0.17Di. Some people claim that this represents the standard butterfly head design, but I believe that what matters most is ease of manufacturing and procurement, as well as meeting strength requirements; therefore, the standard design that is easy to obtain should be used