The valve automatically returns to the neutral position and to open center flow.Ĭlosed-Center Hydraulic SystemsIn the closed-center system, the fluid is under pressure whenever the power pump is operating. When the actuating mechanism reaches the end of its cycle, the pressure continues to rise to a predetermined pressure. The manually engaged and pressure disengaged type of selector valve is similar to the valve previously discussed. This action reopens the open center flow and allows the system pressure to drop to line resistance pressure. The system pressure remains at the relief valve set pressure until the selector valve is manually returned to the neutral position. The relief valve unseats and allows the fluid to flow back to the reservoir. Then, the actuating mechanism reaches the end of its operating cycle, and the pump output continues until the system relief valve relieves the pressure. First, the valve is manually moved to an operating position. One type is both manually engaged and manually disengaged. Several types of selector valves are used in conjunction with the open center system. Operation of the system following actuation of the component depends on the type of selector valve being used.
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