Sorry, but your question does not include nearly enough information to make it possible to answer. Generally, with plumbing questions like yours, pictures are necessary. But that's not an offer -- you're asking me to design a piping repair job for you. I do know how -- I was a licensed master plumber for 30 years -- but it's a lot of work, and I don't know the codes you have to operate under.
I'll offer some advice . . . though you may not welcome it:
Retrofitting older pools with 'salt' (ie, Salt Water Chlorine Generation, SWCG) is often a bad idea. Many older pools are NOT salt-compatible. Piping, metal valves, aluminum ladder anchors, steel diving board anchors, heaters, and more can be severely corroded by the salt water in just a couple of years. And, just from the questions you are asking, I know you do NOT know enough about pools or piping to be able to tell if your pool is salt-compatible.
You might want to read the Salt Pro/Con FAQ -- salt is much more problematic than most people realize and does NOT save money: http://www.poolforum.com/pf2/showthread.php/29186 .
Regarding a "vacuum valve" . . . I don't even know what you are talking about. Do you mean a regular valve (gate, ball, slide, Jandy, etc?) on a line going to/from some sort of vacuum system? Or, do you mean the control valve of an in-floor cleaning system?
Another reason to at least WAIT before making the changes you're considering: you need to learn to OPERATE your pool successfully, BEFORE adding gadgets and gizmos. Salt will NOT fix a green pool, and neither will any sort of automatic vacuum.
You may have a non-functional, or barely functional filter. If so, THAT is a much higher priority.
Also, you're either going to have to learn to do the chemicals right yourself, or else trust your pool to the tender mercies of a dealer testing and dosing program that is DESIGNED to maximize chemical sales.
There's a learning curve with pools, and you're on the wrong end. But unless you want to suffer through years of problems, there's nothing for it, but to start learning. The FAQs in each relevant forum section are a good place to start.
Good luck.
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