What is the purpose of a double check valve assembly (DCVA)?

The purpose of a double check valve assembly (DCVA) is to prevent backflow in irrigation systems and potable water supplies. Backflow refers to the unwanted reverse flow of water, which can contaminate safe water supplies with pollutants. A DCVA consists of two check valves arranged in a series, which effectively create a barrier to backflow under normal operating conditions.

When water flows in the intended direction, the check valves open, allowing water to pass through. If a drop in pressure occurs in the supply line, the check valves close, preventing water from flowing back and potentially bringing contaminants into the system. This mechanism is crucial in protecting public health and maintaining the integrity of water systems.

The other options relate to functions that are outside the scope of what a DCVA is designed for. Flow regulation affects the rate of water flow, irrigation control pertains to managing timing and water distribution in irrigation systems, and water filtration involves removing impurities from water. While these aspects are important in irrigation and water management, they do not describe the primary function of a double check valve assembly.