Those valves are Closed Center with Load sensing... and flow control. The reason you need to kick one valve into neutral to use the other one is simply because the tractor doesn't flow enough oil to operate both at the same time. If you turned the flow controls down to the very slowest setting and the tractor has two pumps... then it might operate both at once.
If you want to add valves in such a way that you don't tie these two rear ones up, the only option you have is to get a valve stack of CCLS valves. That could be tricky. Certainly, NH will get you a set like you have... and they're not cheap. Local hyd shops can probably get you what you need.... but let me tell you, it can be hard to convince them that what you need is a closed center valve with load sensing. Particularly after you tell them it's an open center system. I wish I had the Rexroth numbers for that monoblock... then you could just call a Rexroth dealer and give them a number. Anyhow... what you need is CCLS valves. Then you tee the supply line to feed them. You also need a 'shuttle check tee' for the load sense line and tee that in place. If you don't have it, or you just use a standard tee, the load sense oil will bleed back through the other valve you're not using and nothing will work.... To complete, you tee the returns together and you're done.
Another option... if you didn't need one of the rear remotes... you could just buy a basic tandem center valve with power beyond and plumb it's inlet and return into one of your present remotes and use that to feed it....
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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