The Danfoss hydraulic motor operated valve in most hydraulic motors are fairly simple in design and function. They act as a switchboard, directing the flow of hydraulic fluid into and out of the hydraulic motor.
The Orbital Steering Valve that is Open Center Load Reactive has a built in return-to-center function. This means that when the driver releases the wheel the tires will automatically return to the center position.
Eaton Orbital Motor Control valves serve a very important role in hydraulic system applications because they are used to "counterbalance" the weight of the load to control it when lowering, and can also be used to trap fluid to hold a load indefinitely.