Event: Strip Catcher Cylinder - Lowering (Retract)

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

 

1)    Directional Control Valve 304.06 is energized to the crossover flow pattern allowing pressurized hydraulic fluid to flow through the valve passing from P to B. Next, the fluid flows freely through the B-port check valve of Pilot Operated Check Valve Module 172.28, then through the B-port check valve of Flow Control Valve Module 170.27 and then into the rod end of Strip Catcher Cylinder 807, causing the cylinder to retract.

2)    Exhaust flow from the cap end of the cylinder is forced by the A-port check valve of the flow control valve module to flow through the A-port needle valve of the module, thereby achieving meter-out speed control of the retraction speed of the cylinder.

3)    Next, the exhaust fluid flows freely through the A-port check valve of the pilot operated check valve module, which has been piloted open by pilot pressure from the B-side of the circuit.

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