What is the primary function of check valves on the discharge side of a pump?

The primary function of check valves on the discharge side of a pump is to prevent the flow of water from reversing back through the pump when it is shut off. This is crucial because if water were to flow backward, it could lead to damage or operational inefficiencies within the pump system. The check valve allows fluid to flow in only one direction, effectively maintaining the pressure in the system and ensuring that the water remains in the pipeline instead of returning to the pump. This function is vital for preventing flow reversal that could compromise the system's integrity and disrupt the pumping operation.

In contrast, increasing water flow pressure pertains to the function of pumps rather than check valves. Regulating temperature or filtering impurities involves separate processes and equipment, such as thermostats or filtration systems, which are not the responsibilities of a check valve.