ASSE Backflow Recertification Exam 2026 – Complete Practice Guide

A double check valve assembly is designed to provide protection against backflow in a plumbing system. The assembly consists of two check valves that work in tandem to ensure that if one valve fails, the other can still prevent backflow from occurring. Each check valve is specifically designed to allow flow in one direction while blocking reverse flow, effectively keeping the potable water supply safe from contaminants.

In addition to the two check valves, the assembly also includes two shutoff valves. These shutoff valves are essential for maintenance and testing purposes. They allow the assembly to be isolated from the rest of the system, making it possible to conduct repairs or inspections without disrupting the entire water supply.

This configuration of two check valves and two shutoff valves is standard for double check valve assemblies, aligning with plumbing codes and standards that aim to safeguard water quality and system integrity.