... PLC control with touch screen, 3,pre-bending of high precision,rich bending shapes such as O,U 3 roller rolling machine Which is ... , tuning device , balance device, lubricate device , left and right work frame and bottom plate.1) The upper rollerupper rolls device composed ... Mpa , pressure adjusted by overflow valve, system working pressure 0-19 MPa , normal pressure is 15Mpa . the valves adopted from ...