There are many systems in the aluminum profile extrusion machine. If the pressure is set, it must first be analyzed according to the hydraulic schematic diagram. Usually, the movement of the oil cylinder depends on the relationship between its power and the load. Simply put, even if there is pressure, the load is greater than The power and the oil cylinder will also not move. Setting suggestions: 1. Re-calibrate the power and load; 2. Check similar balance valves (also called back pressure valves), and set the pressure to 21Mpa.