What is a check valve designed to do?

A check valve is specifically designed to permit fluid flow in one direction while preventing backflow in the opposite direction. This functionality is crucial in various water and wastewater systems to maintain system integrity and prevent contamination or system failure. The design ensures that the valve opens when the pressure in the normal flow direction exceeds the pressure on the opposite side, allowing fluid to pass through. Once the pressure in the reverse direction exceeds the pressure in normal flow, the valve closes, effectively stopping backflow.

This characteristic makes check valves vital in applications such as pumping stations and water treatment systems where backflow could lead to inefficiency or even hazardous conditions. They are not intended to control pressure or increase flow velocity, nor do they facilitate bidirectional flow, as this would defeat their primary purpose. Understanding the function of check valves is key for maintaining safe and effective water infrastructure.