What is the function of a check valve on the pump discharge?

The function of a check valve on the pump discharge is to prevent back-flow. When water is pumped through a system, it is essential that the flow remains in one direction to ensure efficient operation and to protect the pump and piping from potential damage caused by reverse flow. A check valve allows the fluid to move forward while automatically closing when there is a reverse flow condition, effectively sealing the pipe and preventing water from returning to the pump.

This mechanical feature is critical in various applications where maintaining the integrity of water flow is paramount. For example, it helps to prevent contamination of the water supply by keeping fluid from flowing backward into the source from which it is being pumped. Additionally, it aids in maintaining system pressures and prevents pump damage associated with cavitation due to unintended back-flow scenarios.

In contrast, regulating water pressure, maintaining water temperature, and enhancing pump efficiency are not the primary roles of a check valve. Each of those functions relates to different components and mechanisms within a fluid delivery system that address other operational needs.