The 3-position, 4-way directional control valve with a 30 bar output at "ee" as shown in the illustration (MO-0116) is a blocking valve associated with the engine turning gear. Which of the following statements describes its function when incorporated into a slow-speed diesel engine starting control air distributor as shown in the illustration (MO-0053)? Illustrations MO-0053 and MO-0116
Official USCG Answer & Rule Citation
Correct Answer: Option C — The blocking valve is used to interrupt the control air at port "A" when the turning gear is engaged.
Interlocking safety systems on marine diesels prevent starting air admission while the turning gear is engaged. The blocking valve interrupts control air at port 'A' to safeguard personnel and equipment.
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