rotary hydraulic valve, position control

are there hydraulic valves out there that act like a three point hitch quadrant control on a standard cylinder?
I would like to have a position relationship type of valve if i add on a 3 point to an older tractor. The common mail order sources do not show anything like this.
i see a functional similarity in hydro static power steering but minor leakage would get the relationship of quadrant and cylinder out of time.

thanks for the info
karl f

You do not say what kind of tractor you have. The first that comes to mind is to find a Farmall 460 or 560 with fast hitch to look at as these have an external linkage from the cylinder/hitch to valve. If you have a farmall 460 or 560 you without fasthitch you should be able to find one and it can be converted to cat. 2 3pt. with few problems. To look at picturews of fast hitch adapted to farmall H or M go to pictures and type in dansuper27 and look thru his pictures till you find him M with fast hitch. He also watches the Farmall/IH site and I think the All ThE Rest forum. Or If you are handy it might be possible to take the valve and cable linkage from a Love bar(or other brand) from an older combine and adapt it to your hitch. Feel free to contact me if you have more questions. Armand

i do not want to say what kind of tractor i have as it puts the blinders on the responses. although not saying seems to as well...lol.

Basically i'm asking about a readily available valve that functions like a 3 point quadrant or tel a depth. (although I've never seen a tel a depth up close.) also have been looking at what the combine header controls are like. I Wonder how the cultivator lift rockshaft control system works on the c/200/etc farmalls, that's also in the same category.
Want to keep this as broad as possible so i can learn more and there may be a use for such a system in a non tractor (or machinery) situation too.

thanks
-karl f
ps thinking about a 3 point on a C farmall that looks factory without all kinds of rods crowding the operator's platform or clamps on the axles. have a decent plan about the lower link mounting and using a 230 rockshaft (gotta check fitment). I want to do a quadrant style control valve, and would love to figure out adding draft control capabilities--would need a bigger tractor just to have the space for all the hoses, pipes, valves, etc.--i think an automatic header control valve and some flow/priority valve(s) would fit that purpose. I posted about that combine valve idea about a week ago on the combine board and linked to it on this one too, but the responses were few and indicated that those valves were not to reliable or predictable.
Yes, i have a whole complete Super C fasthitch at my disposal, just have to bolt it on, but what fun is that???
My planning isn't as sloppy as my writing, i could make time to explain better if needed via email.
floor_it at yahoo dot com