Event: Coil Car Cradle Roller Cylinder - Unblocking (Retract)

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

 

1)    Directional Control Valve 302.39 is energized to the crossover flow pattern allowing pressurized hydraulic fluid to pass through the valve from P to B.

2)    The fluid flows freely through the B-port check valve of Pilot Operated Check Valve Module 172.27 and through the B-port check valve of Dual Flow Control Module 179.26 then into the rod end of Coil Car Cradle Cylinder 802 causing the cylinder to retract.

3)    Exhaust fluid from the cao end of the cylinder is forced by the A-port check valve of the flow control module to flow through the A-port needle valve of the module, thereby controlling the retraction speed of the cylinder.

4)    Next, the exhaust fluid flows through the A-port check valve of the pilot operated check valve module, as the A-port check valve has been piloted open to allow reverse flow by pilot pressure from the B-side of the module.

5)    Finally, the exhaust fluid flows through the directional control valve, passing from A to T, then to tank though Duplex Return Line Filter 045.03.