In which section of an installation should a check valve be installed?

A check valve is crucial in maintaining the proper flow direction within a piping system, preventing backflow that could cause issues in the system's operation. In the context of a sprinkler system, the discharge piping is the most appropriate place for a check valve to be installed. This placement ensures that once water is discharged from the system, it cannot flow back into the supply lines, which could pose risks such as contamination or system malfunction.

Typically, check valves are used in areas where it is important to prevent backflow, particularly after the water has been discharged to the system. This helps to maintain the integrity and efficiency of the sprinkler operation while also ensuring compliance with relevant safety standards. In other areas, such as the pump suction or fire riser, different types of valves serve more specific functions related to system control and flow management; hence a check valve is not suitable or required in those locations.