What is the main feature of a relief valve?

The main feature of a relief valve is to release excessive pressure within the pump. This function is critical in maintaining the safety and integrity of the pumping system. When the pressure in the system exceeds a predetermined set point, the relief valve opens, allowing fluid to escape, which helps prevent possible damage to the pump and the associated piping system caused by overpressure conditions. By relieving excess pressure, the valve ensures that the system operates within safe limits, thus prolonging the life of the components and reducing the risk of failures or leaks.

In contrast, the other options do not accurately describe the primary function of a relief valve, as they focus on aspects that do not pertain directly to its role in pressure management.