The primary purpose of a relief valve is to _____.

The primary purpose of a relief valve is to _____.

• A. Control flow
• B. Avoid pump reversal
• C. Limit system pressure
• D. Hold pump prime

Answer: (C)

Relief valves protect the hydraulic system by keeping pressure from exceeding a safe limit. When the circuit demands more pressure than the set point, the valve opens and allows fluid to return to the reservoir, preventing excessive pressure that could damage components. This is why limiting system pressure is the primary purpose. Flow control regulates how much fluid passes to downstream components, not the maximum pressure. Preventing pump reversal relies on anti-reverse devices or check valves, not a relief valve. Holding the pump prime is about maintaining the suction side and preventing air ingress, which a relief valve does not manage.

Relief valves protect the hydraulic system by keeping pressure from exceeding a safe limit. When the circuit demands more pressure than the set point, the valve opens and allows fluid to return to the reservoir, preventing excessive pressure that could damage components. This is why limiting system pressure is the primary purpose.

Flow control regulates how much fluid passes to downstream components, not the maximum pressure. Preventing pump reversal relies on anti-reverse devices or check valves, not a relief valve. Holding the pump prime is about maintaining the suction side and preventing air ingress, which a relief valve does not manage.