butterfly valves

[Clive Apps Techno-Logicals 416 510 0020]

> 
> 
>  Does anyone have a typical chart of flow vs. valve angle for round
> butterfly valves?  I thought this would be something I could look up in
> my shelf of engineering handbooks, but I've come up with nothing useful.


the area could be calculated using calculus

the # would be 
circle area -
2x [area section for 1/2 cylinder at angle y]

angle y would be the only variable
might be simpler to calculate the area than use a table

the flow could be related to vacuum @ area vs RPM

>  I expect the flow would be highly nonlinear; I'm just trying to come up
> with a rough table to start off with for a delta-TPS injection setup.

probably 4th order

Clive