Generally, a flow divider with priority flow divides the pressurized oil: 3 GPM or so constant flow to the power steering, and the rest to whatever else you are running on the system. Usually, the "whatever else" flow goes through an open center valve that controls loader, remote hydraulic, or whatever.
So it will send a constant 3 GPM through the power steering system, and the turning of the steering wheel will direct the flow from that 3 GPM. If the wheel isn't turning, it just goes through the power steering system ( which is, itself, an open center system) and back to the reservoir.
Best way to envision an open center system is the pump, constantly pumping, to the reservoir, where the pressure is lost, and from the reservoir by gravity back to the pump, and on around again. The hydraulic applications are put between the pump and the reservoir. If you've got a 15 GPM pump, and the only application is a loader, the whole 15 GPM goes through the loader valves, and is diverted as needed to run the loader. If you're running a power steering system as well, then a priority flow divider ahead of the loader valve, so 3 GPM gets taken out for the steering (and returned to the reservoir by its separate hose), and 12 GPM goes through the loader valve, available when needed for the loader.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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