Event: Mandrel Support Bearing Cylinders - Close (Extend)

For previous steps in this sequence see the event “HPU – On.”

Due to the weight of the finished coil and load forces, the Operator Side of the Coiler Mandrel needs to be supported during coiling by a support bearing, but the bearing halves need to be pivoted away after coiling to allow removal of the finished coil from the mandrel.

1)    Directional Control Valve 317 is energized to the parallel flow pattern allowing pressurized hydraulic fluid to pass through the valve from P to A.

2)    Next, the fluid flows through Rectifier Plates 160.01 and 160.02 and Flow Control Valves 186.05 and 186.06. The check valves in the rectifier plates are arranged so that they direct the fluid to flow in only one direction through the flow control valves. Using compass directions, the incoming fluid is blocked by the SE check valve, thereby forcing the fluid to flow through the SE valve. Next, the NE check valve forces the fluid to flow through the flow control valve, from right to left in the schematic. The check valve which is part of the flow control valve forces the fluid to be metered by the flow control valve. Next, the NW check valve allows the metered fluid to flow into the cap ends of Mandrel Support Bearing Cylinders 806.01 and 806.02, causing the cylinders to extend while achieving meter-in speed control of the extension speed of the cylinders.

3)    Exhaust fluid from the rod ends of the cylinders flows back to tank through the directional control valve, passing from B to T, and Duplex Return Line Filter 045.03.

4)    Pressure Relief Valves 285.14 and 285.16 protect the cap ends of the cylinders from overpressure.