What should always be installed at the discharge of each pump discharge line in a sump or ejector basin?

The installation of a check valve and shutoff valve at the discharge of each pump discharge line in a sump or ejector basin is crucial for ensuring the efficient and safe operation of the pumping system.

A check valve is essential because it prevents the backflow of water into the sump or ejector basin when the pump shuts off. This is important to maintain the integrity of the system and to avoid unnecessary cycling of the pump, which can lead to wear and tear. When the pump is not actively discharging, backflow could lead to flooding or excessive water levels in the basin, causing potential damage or operational issues.

The shutoff valve serves as a means to isolate the pump and the discharge line from the system when maintenance is needed. This allows for safe servicing of the pump without having to drain the entire system or suffer from excessive water spillage.

In contrast, while pressure relief valves, flow meters, and flow control valves have their own specific applications and benefits in plumbing systems, they do not perform the same critical functions related specifically to backflow prevention and maintenance isolation that the combination of a check valve and shutoff valve provides in this context.