Here's another Flint Hydraulic Tech Tip: The grade-cutting blade of a machine must be controlled in three ways: direction, speed and position. A hydraulic directional control valve, as the name implies, controls the direction of oil flow in a hydraulic system. Flow direction determines the direction of the hydraulic cylinder (extension/retraction) which, in turn, moves the machine's blade (up/down; tilt right/left; side shift right/left).
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