Troubleshooting Challenge: Cargo Ship Pressure Buildup Problem (.PDF Download)

A cargo ship has a hydraulic power unit (HPU) that opens and closes several hatch doors on grain-storage areas. The accompanying schematic shows a circuit for one of eight cylinders and valves located close to the doors, with the HPU on a lower deck. The HPU is located midway between two sets of four. The pressure and return lines run approximately 200 ft. in each direction...

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