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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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