🔍 Key Concepts

• Function of a check valve in a fluid system • What it means to maintain system prime in a lube oil system • Flow direction when a pump is secured or not running

💭 Think About

• Ask yourself: what does a check valve physically allow and what does it block in a pipeline? • If the pump is stopped, what undesired movement of oil could happen without a check valve? • Which option actually describes a typical check valve function in any piping system, not just on gas turbines?

✅ Before You Answer

• Verify which choice describes directional control of flow rather than pressure increase or oil return routing. • Confirm that maintaining prime is related to keeping the pump and suction line full, not raising pressure. • Eliminate any options that describe functions normally handled by relief valves or return/sump drains, not by check valves.