Final answer:
The purpose of a pressure relief valve in a constant displacement pump is to prevent overpressure and ensure the safety of the pump and the connected system.
Step-by-step explanation:
The purpose of a pressure relief valve in a constant displacement pump is to prevent overpressure and ensure the safety of the pump and the connected system. The pressure relief valve is designed to open when the pressure inside the pump exceeds a certain threshold, allowing excess fluid to escape and maintaining the pressure within a safe range.
For example, in a hydraulic system, if the pressure in the system becomes too high, it can cause damage to the pump, pipes, or other components. By installing a pressure relief valve, the excess pressure is relieved, preventing any potential damage or failure.
In the case of the pump providing pressure to the pipeline, a pressure relief valve can protect the pipeline from excessive pressure if there are any blockages or restrictions in the flow.