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 - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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