What is the purpose of a discharge relief valve?

• A. To regulate discharge pressure
• B. To prevent over-pressurization of the discharge side and protect hoses and equipment
• C. To shut off water supply during maintenance
• D. To filter debris from the discharge line

Answer: (B)

The discharge relief valve exists to protect the system from excessive pressure on the discharge side. It stays closed during normal operation, but if discharge pressure rises above its preset limit, it opens to release water through a safe path (such as back toward the pump suction or a relief line). This prevents damage to hoses, fittings, and other equipment that can fail under high pressure. It isn’t meant to regulate normal discharge pressure, shut off water during maintenance, or filter debris—those functions are handled by other components.