New Mexico Pipe Fitter Journeyman (JPF) Practice Exam

What is a common application for a relief valve?

1. Flow regulation

2. Drainage

3. Overpressure protection

4. Flow measurement

The correct answer is: Overpressure protection

A relief valve is specifically designed to provide overpressure protection in various systems. Its primary function is to release excess pressure that builds up within a system, such as a tank or piping, to prevent potential damage or catastrophic failure. When the pressure exceeds a predetermined limit, the relief valve opens automatically, allowing fluid to escape and thus reducing the pressure to a safe level. This mechanism is crucial in maintaining the safety and integrity of pressure vessels and pipelines. In contrast, other options such as flow regulation, drainage, and flow measurement do not align with the primary role of a relief valve. For example, flow regulation involves controlling the amount of fluid passing through a system, which is not the purpose of a relief valve. Similarly, drainage pertains to the removal of liquid from a system, and while relief valves may inadvertently allow drainage due to overpressure, their primary role is not aimed at controlling drainage. Flow measurement refers to determining the flow rate of a fluid, typically achieved through flow meters rather than relief valves designed for pressure control. Thus, the role of the relief valve as a protective device against overpressure is what distinguishes it in this context.