Which valve is used to prevent backflow in a sewage system?

The check valve is specifically designed to prevent backflow in a sewage system. It operates by allowing fluid to flow in one direction while automatically closing to block flow in the opposite direction. This function is crucial in sewage systems where backflow can lead to contamination and other serious operational issues. The effective operation of a check valve helps maintain the integrity of the sewage collection system and ensures that wastewater flows smoothly toward treatment facilities without reverting back into the system.

In contrast, a float valve is primarily used to control the level of liquid in a tank by opening and closing based on the liquid level. A bypass valve is typically employed to divert flow around a particular part of the system for maintenance or emergency scenarios. Lastly, a pressure relief valve is intended to avoid overpressure situations by releasing pressure, rather than preventing backflow. Thus, the role of the check valve is distinct and critical for backflow prevention in sewage management.