If you've ever seen a hydraulic system struggle to control the actuator moving in a jerky manner, pressure spikes, or poor control of speed, the cause is usually the same: the valve that controls the flow of fluid is open or closed completely, and there is nothing else between. This kind of binary operation is fine for simple applications that require on/off; however, many modern hydraulic systems require some sort of more accuracy. This is where proportional valves step into the picture.
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