🔍 Key Concepts

• Study FIG. C and FIG. D to see what changes when the system shifts from water discharge to oil discharge mode. • Trace the oil path from the top of the separator tank through V2 / V2A and note what happens if that path is blocked. • Review the function of the long and short level probes (item S)—which one senses oil, which one senses water, and how that signal starts or stops the cycle.

💭 Think About

• When the unit goes into oil discharge, what is V2A supposed to allow to move, and to where? If it does not open, where will that fluid stay? • If oil cannot leave the separator top, how will the levels around the long and short probes change over time—will they be covered by oil, water, or both? • Which of the answer choices matches a condition where the automatic control never ‘sees’ the expected level change at the probes and therefore cannot advance the cycle?

✅ Before You Answer

• Verify in the illustration whether V2A is only in the oil discharge line or also used for backflush water. • Check which figure shows normal oil discharge and what the probe S is immersed in at the start and at the end of that step. • Confirm whether backflush water ever has a direct path back to bilge spaces through the top of the separator when V2A is shut.