Sizes for Level Control Flanged Valves

How about Fisher? (see table 1)

http://www.documentation.emersonprocess.com/groups/public/documents/brochures/d351047x012.pdf

We had a similar problem once, and small flanged valves in 3/4 and 1 inch sizes were hard to find and very costly. But regular threaded valves were plentiful and cheap and so were small steel flanges, already threaded. So we got threaded valves, screwed them into the flanges with a suitable sealant and voila, here were flanged valves. For us this worked very well.

Baumann of Fisher for small control valve with flanges

You can get a flanged interface but it includes threaded connection

See http://www.penberthy-online.com/gagesvalves8.asp