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- Q624 - General Subjects
57. Which of the listed pressure-control valves would be used in a hydraulic system to temporarily divert some, or all of the pump discharge until the additional flow was required?
An unloading valve is designed to temporarily divert pump flow to the reservoir when demand is low, restoring flow when needed. This function distinguishes it from counterbalance valves (load control), compound pressure-relief valves (overpressure protection), and sequence valves (flow sequencing).
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