Which valve is designed to relieve pressure automatically at a set limit?

Which valve is designed to relieve pressure automatically at a set limit?

• A. Relief valve
• B. Safety valve
• C. Gate valve
• D. Needle valve

Answer: (A)

An automatic pressure-relief function is provided by a relief valve. It is built to stay closed under normal pressure, then open automatically when the system reaches a preset limit, venting fluid to prevent overpressure. When pressure drops again, it closes on its own. This behavior directly matches the description of relieving pressure automatically at a set limit. Gate valves and needle valves control or isolate flow but do not automatically vent excess pressure. A safety valve is related and also relieves pressure, often in boiler systems, but the term that most precisely describes a device that maintains a preset relief point is the relief valve.

An automatic pressure-relief function is provided by a relief valve. It is built to stay closed under normal pressure, then open automatically when the system reaches a preset limit, venting fluid to prevent overpressure. When pressure drops again, it closes on its own. This behavior directly matches the description of relieving pressure automatically at a set limit.

Gate valves and needle valves control or isolate flow but do not automatically vent excess pressure. A safety valve is related and also relieves pressure, often in boiler systems, but the term that most precisely describes a device that maintains a preset relief point is the relief valve.