Can someone name this valve???

I'm looking for some info on a valve. It is fitted inside an annulus and is used to control air flow. it's similar to a butterfly valve, but with hole in it. Any information will be greatly welcomed, as i'm in a slight fix, thanks

an annulus where?

more info please, what type of car are we talking about? pictures? is the hole in the middle of the butterfly, to the side, or above? or elsewhere?

Can someone name this valve???

Frank

Well ,the valve is for a turbine. the proplem is i'm looking for pics.it consists of a number diamond shape butterflies evenly distributed around the circumference. I'm not too sure ye'll get much from that discription

The valve you are looking for, if it is the correct one I am thinking about, it is called a heater control valve. It works off of engine vaccum, and the heater switchboard inside your car. It controls nothing more than the tempature of the cabin air, and the rate at witch it flows. And guys, cut me a little slack, don't get mad at my user name, I own imports too. 95 eclipse gst, 91 talon tsi, and a 94 honda civic ex with a d16y8 swap. Mustangs4Life