Plant Operation Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

What safety device is used to prevent overpressure in a pressure vessel?

Check valve

Relief valve

A relief valve is an essential safety device specifically designed to protect pressure vessels from the dangers of overpressure. When the pressure within a vessel exceeds a predefined limit, the relief valve opens to release excess pressure, preventing potential failure or explosion of the vessel. This function is crucial in maintaining operational safety, as it ensures that the pressure remains within safe limits.

Unlike a check valve, which prevents backflow in a system, the relief valve actively releases pressure to manage safety during operations. A shut-off valve, on the other hand, is used to start or stop the flow of a medium and does not serve the purpose of managing excessive pressure. Similarly, a flow meter is used for measuring the flow rate of a fluid and does not contribute to pressure management.

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Shut-off valve

Flow meter

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