Cross Connection Practice Exam

What is the minimum static pressure that each check valve in a Double Check Valve Assembly is designed to hold in the direction of flow?

1. 0.5 psi

2. 1.0 psi

3. 1.5 psi

4. 2.0 psi

The correct answer is: 1.0 psi

The minimum static pressure that each check valve in a Double Check Valve Assembly is designed to hold in the direction of flow is 1.0 psi. This standard is established to ensure that the check valves can effectively prevent backflow under normal operating conditions. The pressure rating is essential because it reflects the valve's capability to maintain a seal and function properly during periods of system pressure fluctuation or back pressure situations. Check valves are crucial components in preventing cross-connections, ensuring that potable water supplies are protected from contamination. A minimum pressure of 1.0 psi ensures that even with slight variations in pressure, the valves still provide reliable closure and prevent reverse flow. This design consideration is vital, especially in installations where water supply and system demands can change, potentially leading to backflow conditions. Understanding this minimum design pressure is critical for anyone involved in cross-connection control, plumbing design, or water safety management.