does a pump unloading

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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How does a pump unloading circuit extend equipment life?

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Step 1

Unloading valves are pressure-control devices that dump excess fluid into a tank under little to no pressure. Hi-lo pump circuits, in which two pumps move an actuator at fast speed and low pressure, then the circuit switches to a single pump supplying high pressure to conduct work, are a typical use.

Another use is to divert excess flow from an oversize-rod cylinder's cap end to a tank when the cylinder retracts. This allows for the use of a smaller, less expensive directional control valve while maintaining a modest pressure drop.

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