Operation of the system on EMERGENCY power. The steering wheel (1) is disconnected from its shaft by pulling out the locking pin in the hub, and then pulling the wheel aft, disengaging it from the clutch jaw on the drive shaft. The locking arm underneath the wheel is pulled up to a horizontal position to hold one of the wheel spokes in its fork, and locked in that position by inserting the pin under it.
The change valve (2) is set at EMERGENCY.
The clutch handle (1, Figure 4-15) is up, the locking bar arm (9, Figure 4-15) is pulled out and turned, allowing the shaft of the emergency control valve to be turned.
The motor (3, Figure 4-26) is OFF.
The steering manifold (9) hand cut-out and ram cut-out valves are OPEN.
The emergency steering valves in the main hydraulic system main supply and return manifolds (16 and 17) are now opened (see Chapter 3).
The system is now ready for operation on EMERGENCY.
The submarine is steered from the control room by turning the small emergency hand wheel (13). Let us suppose the submarine is running on a straight coarse, the rudder indicator showing zero degrees deflection. The steersman receives the order, "Right 20 degree rudder." He turns the emergency steering wheel to the left.
Its motion is transmitted through the spur gears (14) to the emergency control valve shaft (15). This turns the nonrising stem inside the valve, raising the sleeve and opening the channel from the pressure line of the main hydraulic system to one of the lines leading to the auxiliary power ports on the steering system main manifold (9).
Oil from the main hydraulic system will
then flow through the emergency control valve to the manifold (9), into the forward end of the port ram (10) and the after end of the starboard ram (11). The port ram moves aft, the starboard ram moves forward; the connecting rods (12) swing the crosshead and rudder to the right.
But we have not yet followed the movement of oil in the system to the completion of its cycle. We have already traced the path of the oil from the main hydraulic system until it reached and actuated the rams. When the port ram has moved aft and the starboard ram has moved forward, the oil is driven out of the opposite ends of the main cylinders, back through the manifold (9) into the return port of the emergency control valve, and out into the return line to the main hydraulic return manifold, completing its cycle.
WARNING. It is necessary to turn the change valve to EMERGENCY before operating the emergency control valve. Turning the change valve to EMERGENCY blanks off all lines except the bypass ports around the telemotor pump, and thus protects the rest of the equipment from the effects of the sudden entrance of oil at a pressure of 600 pounds to 700 pounds per square inch. Oil under high pressure will actuate various moving parts accessible to it, motorize pumps, and may cause various sudden, and possibly dangerous, results to apparatus or personnel. Disconnecting the main steering wheel when changing the system over to EMERGENCY, is an added precaution.
Gotta love the Fleet submarine manual
