What is a Double Check Valve Assembly (DCVA)?

A Double Check Valve Assembly (DCVA) comprises two check valves positioned in series along with test cocks that allow for testing the functionality of the valves. The primary purpose of a DCVA is to provide backflow prevention, ensuring that water cannot flow backward into the clean water supply, which is essential in protecting public health and safety. The design of the assembly allows it to prevent contamination from potential cross-connections while offering a means to test the valves for any malfunctions without disassembling the system.

In contrast, other options describe components not fitting the specific role and design of a DCVA. For instance, a single valve used in pipeline systems does not offer the necessary backflow prevention features that the double check assembly provides. Similarly, a type of pump used for firefighting and a valve with no moving parts do not relate to the definition and function of a DCVA in the context of plumbing systems and fluid control.