Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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What type of valve allows oil to flow in one direction only?

Check valve
Ball valve
Butterfly valve
Relief valve

The correct answer is: Check valve

A check valve is specifically designed to permit fluid flow in one direction while preventing backflow. This is crucial in systems where maintaining the directional flow of oil is essential to operational safety and efficiency. The check valve typically features a mechanism, such as a hinged disc or a spring-loaded ball, that automatically closes when there is a reversal of flow, thus ensuring that the oil does not flow back into the previous section of the system. In contrast, a ball valve and a butterfly valve are types of valves that can regulate or block fluid flow in a system but don't inherently provide the same backflow prevention functionality as a check valve. Both of these valves can be closed to stop flow but can allow reverse flow if not properly configured. A relief valve, on the other hand, is intended to protect a system from overpressure; it doesn't control directional flow but instead releases excess pressure. The specialized function of the check valve makes it the appropriate choice for preventing backflow in oil systems.