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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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