Both open center and closed center systems are available today. The newest closed centers use a variable displacement pump so they aren't using power when no flow is need.
Those pumps are $$$ and the controls to run the system are complicated.
The benefit is if you need low flow when running high rpm's, you can set a flow control to exactly what you need. The main use of this I know of is sprayers if you are adjusting pump delivery volume to a set value and also for folding their spindly booms slowly without breaking them.
Old fashioned closed centers are one of the big reasons many Deeres used so much fuel compared to others.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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