Under what condition is a check valve allowed between the pump and the piping network?

A check valve is designed to prevent backflow in a piping system, ensuring that liquids can only flow in one direction. When considering the installation of a check valve between the pump and the piping network, specific environmental conditions can influence the decision.

In this context, having the piping system below the frost line is significant because it serves to protect the piping from freezing. If pipes are above the frost line, there is a higher risk of them freezing and bursting, which can lead to water damage and system failures. Installing a check valve in a system that is below the frost line minimizes these risks, as the piping is less likely to experience freezing conditions. This allows for proper operation of the check valve while also maintaining uninterrupted flow from the pump without the risk of backflow.

This condition is particularly important in regions with cold climates, like many areas in Illinois, where frost depth can vary significantly. By installing the check valve in a protected environment, you help maintain system integrity and efficiency, ensuring reliable operation of the septic system without the complications that freezing conditions can introduce.