What is the purpose of a check valve on a lift station force main?

A check valve is a vital component in a lift station force main, serving the primary purpose of preventing backflow. This is crucial in wastewater systems, where it is essential to avoid the reverse flow of sewage and wastewater back into the lift station or upstream systems. If backflow occurs, it can lead to contamination, overflow, and damage to equipment, as well as public health hazards.

By allowing flow in one direction and automatically closing when there is an attempt to flow in the opposite direction, a check valve ensures that wastewater moves efficiently toward its destination without the risk of reversal. This one-way operation is critical for maintaining the integrity and functionality of the wastewater treatment system.

In contrast, other options like increasing pressure in the system, regulating flow rates, or measuring flow volume do not align with the fundamental function of a check valve. Instead, those tasks might be handled by different types of valves or devices designed specifically for those purposes, highlighting the unique role that a check valve plays in wastewater management.