Hi All,
If anyone is interested in this sort of thing have a look here:
http://www.pmillett.com/technical_books_online.htm
It's not the fastest site in the world but there is a ton of information to be had, much of it to do with valves.
The 'title' part is usually just a table of contents, if you want the whole thing click in the link below it where it says 'download full text with index' (or similar).
Cheers,
Mike.