The pump pressure goes down and flow increases. When the control valve is released, the fluid remains trapped in the cylinder, and the workload is supported. However, the oil pressure is increased to the level necessary to perform the work. When flow is directed via a control valve to a cylinder, the oil volume stays constant. With an open-center system, the pump produces a continuous flow of oil that must return to the reservoir when the cylinder or other actuator is not being moved. As farmers grew more dependent on hydraulics, their systems advanced to a closed-center system and finally to a load-sensing system. Most early hydraulic systems used on tractors were open-center designs. Pressure is the result of a restriction to flow.įlow-control design in a hydraulic system can be an open-center, a closed-center, or a load-sensing system. It’s important to remember that hydraulic pumps cause oil to flow but they do not create pressure.
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