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 - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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Sell 1958 Hi-Altitude Massey Fergerson tractor, original condition. three point hitch pto engine, Runs well, photos available upon request
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