Press Upgrade Didn't Fix Overheating Problem

摘要

THE ABOVE CIRCUIT drawing for a hydraulic press was upgraded after 10 years of continuous 24/7 operation. They replaced the main directional valve, added valve 3B unloading circuit, and installed a separate pilot pressure pump. This was all done to reduce the heat that was thought to be caused by the high flow through the directional valve when the cylinder retracted and omitted a 75 psi (0.5 MPa) back pressure check in the main pump line that supplied external pilot pressure to the valve.