What is the primary purpose of throttling an outlet valve on a pump?

Throttling an outlet valve on a pump primarily serves to reduce flow, which can help manage the operational parameters of the pump and improve its overall performance. When the outlet valve is throttled, it restricts the flow of fluid leaving the pump, which consequently leads to a reduction in flow rate.

This reduction in flow can help to cool the pump since less fluid is passing through at any given time, minimizing the risk of overheating due to excessive friction or recirculation within the pump system. While other options may have relevance in different contexts, the primary goal of throttling in this case focuses on controlling flow rate and improving coolant flow through the pump components.

Managing flow through throttling is a critical operational practice in many pumping systems, especially to prevent cavitation and ensure that the pump operates within its designed characteristics.