What is a double check valve assembly?

A double check valve assembly is a crucial component in irrigation systems that plays a significant role in backflow prevention. This assembly consists of two independently operating check valves, which are positioned in such a way that they prevent water from flowing backward into the main water supply. The design includes two shut-off valves, one on each side of the assembly, which allows for easy maintenance and testing.

The primary function of the double check valve assembly is to ensure that the water supplied to the irrigation system does not contaminate the potable water supply by preventing backflow due to pressure changes or siphoning. This is particularly important in protecting public health and safety, as contaminated water can lead to serious health risks.

In practical applications, the double check valve assembly is often utilized in irrigation systems where there may be a moderate risk of contamination, such as in landscape irrigation where fertilizers or pesticides may be used. This assembly provides an effective barrier to protect the municipal water supply, which is why it is a common requirement in many irrigation codes and standards.