Device "27" shown in the illustration is used to __________. Illustration MO-0111

Correct Answer: Option C — regulate maximum vacuum during normal operation

Device 27 functions as a vacuum breaker or regulator. In marine distillation plants, maintaining a specific vacuum is critical for low-temperature evaporation. This valve prevents the vacuum from exceeding design limits, which could otherwise cause structural stress or operational instability, ensuring the system remains within safe parameters defined by manufacturer specifications.