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What is the difference between an open center and closed center system?
Wiki User
∙ 12y ago
In a closed centre system the selector valves are generally arranged in parallel to each other. Thus hydraulic pressure is maintained at each selector valve equally and multiple devices can be operated with little degradation in performance. The closed centre valves block flow when in the neutral position and excess pressure is returned via an unloading valve or not produced in the case of a variable displacement pump.
Open centre systems pass oil straight through the centre of each selector valve when in the neutral position and return it back to the reservoir. Oil thus circulates with little or no pressure till a selection is made. All oil is then ported to the side of the actuator selected and oil from the contracting side passes back to the line to be utilised by the next selector downstream. Eventually as oil pressure builds the the open centre selector returns to the neutral position and oil pressure drops away again. Open centre systems don't require a pressure regulator and do not operate multiple systems well together. All open centre selectors are mounted in series to each other.
Wiki User
∙ 12y ago
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