Which device protects plant components from overpressure?

Which device protects plant components from overpressure?

• A. Relief Valves
• B. Check Valves
• C. Gate Valves
• D. Isolation Valves

Answer: (A)

Overpressure protection comes from devices that actively release fluid when pressure rises beyond the safe limit. A relief valve is designed to open at a predetermined set pressure and vent the fluid to a safe location, automatically closing again once pressure returns to normal. This behavior directly prevents pressure from continuing to climb and damaging vessels, pipes, or equipment. Relief valves must have enough relieving capacity to handle the worst‑case event, considering where the released flow is going and the backpressure in the vent path. In many systems you’ll find multiple relief devices sized to handle the required flow. The other options don’t provide this kind of protection. A check valve stops backflow but doesn’t limit or release excess pressure. Gate valves and isolation valves are on/off flow control devices; they can isolate sections but won’t relieve overpressure and, if closed while pressure is high, can even trap pressure or cause damage.

Overpressure protection comes from devices that actively release fluid when pressure rises beyond the safe limit. A relief valve is designed to open at a predetermined set pressure and vent the fluid to a safe location, automatically closing again once pressure returns to normal. This behavior directly prevents pressure from continuing to climb and damaging vessels, pipes, or equipment.

Relief valves must have enough relieving capacity to handle the worst‑case event, considering where the released flow is going and the backpressure in the vent path. In many systems you’ll find multiple relief devices sized to handle the required flow.

The other options don’t provide this kind of protection. A check valve stops backflow but doesn’t limit or release excess pressure. Gate valves and isolation valves are on/off flow control devices; they can isolate sections but won’t relieve overpressure and, if closed while pressure is high, can even trap pressure or cause damage.