Where should a relief valve be installed in relation to the pump discharge line?

Installing a relief valve downstream of the pump discharge line is critical for ensuring safety and proper system operation. When positioned in this location, the valve can effectively manage and relieve excess pressure that may occur in the discharge system after the pump has increased the fluid's pressure. This helps prevent potential damage to components that may not be rated for higher pressure, such as piping or fittings, and protects the pump itself from operating in an unsafe condition.

Furthermore, placing the relief valve downstream ensures that it is able to react to pressure increases caused by factors such as system back pressure or sudden changes in flow. In the event of a failure or blockage, the relief valve will open to allow the excess pressure to escape, thereby maintaining a safe operating environment and preventing catastrophic failures.

The other options, such as placing the relief valve upstream of the pump or at the suction or base of the pump, would not effectively protect the system after the discharge, which is crucial for maintaining system integrity and operation.