Yuken Unloading Relief Valves
These valves are used to operate pumps at the minimum load in an accumulator circuit or in a high-low pump circuit. In an accumulator circuit, when the system pressure reaches a preset level (i.e. cut-out pressure), the valve opens to divert the pump delivery to the reservoir at low pressure; thus, the pump is unloaded automatically. When the system pressure drops to the cut-in pressure (approximately 85% of the cut-out pressure normally), the valve closes to direct the loaded pump delivery to the accumulator and the hydraulic system.
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