What is the term for the backflow prevention method that uses two independently acting check valves?

The term that accurately describes a backflow prevention method using two independently acting check valves is a double check valve assembly. This device consists of two check valves arranged in series, which act together to allow water to flow in one direction while preventing it from flowing backward. This configuration is particularly effective in reducing the risk of contamination from backflow in water supply systems, making it a reliable choice for protecting potable water.

To further understand the context, pressure relief valves are designed to relieve excess pressure in a system and aren't primarily focused on backflow prevention. The reduced pressure principal device also serves as a backflow prevention method, but it employs different mechanisms including a pressure differential to create two separate zones of pressure, which differs from the dual-check valve setup. An atmospheric vacuum breaker functions to prevent backflow due to siphonage but does so through a different principle, making it unsuitable for situations requiring the dual check valve approach. Therefore, the double check valve assembly is the correct term for this method of backflow prevention using the specified design.