🔍 Key Concepts

• Oily water separator flow path from bilge to separator to overboard/sludge tank • Location and purpose of the oil discharge line versus the inlet line • How valves near the top of the separator tank are typically used in this system

💭 Think About

• Trace the piping: where does the fluid enter the separator tank, and where does separated oil leave? Which line is valve 4 connected to? • Compare the function of a suction valve at the pump with a regulating or control valve at the separator. Does valve 4 appear close to the pump or at the separator outlet? • Look at other numbered components (such as 5, 6, and 14). How do their labels and positions help you deduce what service valve 4 must provide?

✅ Before You Answer

• Verify which side of the system valve 4 is on: pump module, separator inlet, or separator outlet • Identify where the overboard discharge and oil discharge/sludge connections are located in the illustration • Confirm whether valve 4 is drawn on a line that is carrying water, separated oil, or mixed oily water, based on its height and connection to the separator body