The relief valve opens when

The relief valve opens when

• A. Opens when pressure rises above the set pressure
• B. Closes when pressure rises above the set pressure
• C. Never opens
• D. Opens only when manually reset

Answer: (A)

Relief valves provide automatic protection against overpressure by venting whenever the system reaches a preset limit. When the system pressure climbs to or slightly above the set pressure, the valve lifts against its spring and opens to release fluid, dropping the pressure back toward safe levels. It then reseats automatically once the pressure falls below the reseal point. This operation is automatic and not dependent on manual action, which is why opening at the set pressure is the correct description.

Relief valves provide automatic protection against overpressure by venting whenever the system reaches a preset limit. When the system pressure climbs to or slightly above the set pressure, the valve lifts against its spring and opens to release fluid, dropping the pressure back toward safe levels. It then reseats automatically once the pressure falls below the reseal point. This operation is automatic and not dependent on manual action, which is why opening at the set pressure is the correct description.