What is the primary purpose of installing a check valve in a pump discharge line?

The primary purpose of installing a check valve in a pump discharge line is to prevent backflow and hydraulic shock. A check valve is designed to allow fluid to flow in one direction while automatically preventing flow in the opposite direction. This is crucial in pump systems because, without a check valve, fluid could flow back into the pump when it is shut off, which can lead to a range of issues, such as reduced system efficiency, potential damage to the pump, and the creation of hydraulic shock, also known as water hammer, which can cause severe pressure surges.

By preventing backflow, the check valve ensures that the pump maintains a prime and does not lose its ability to function effectively when restarting. Moreover, this protection against backflow also helps maintain the integrity of the entire plumbing system, safeguarding it from the damaging effects of inverted flow. Hence, the installation of a check valve is a best practice in pump discharge lines to ensure system reliability and longevity.