Which device prevents backflow from a non-potable water source into the potable water system?

Which device prevents backflow from a non-potable water source into the potable water system?

• A. Back flow prevention device
• B. Pressure reducing valve
• C. Globe valve
• D. Check valve

Answer: (A)

Backflow prevention protects the drinking water system from contaminants that could be drawn back into it from a non-potable source. The device designed for this purpose is a back flow prevention device, engineered to block reverse flow even when pressure in the non-potable line fluctuates or when back-siphonage occurs. These assemblies often combine one or more check valves with relief components or vents to ensure the potable supply cannot be contaminated. A pressure reducing valve lowers the pressure in the system but does not by itself stop backflow. A globe valve is used to throttle or shut off flow, not specifically to prevent backward flow into the potable supply. A single check valve blocks flow in one direction but may not provide complete protection in all cross-connection scenarios and may not meet code requirements for backflow protection.

Backflow prevention protects the drinking water system from contaminants that could be drawn back into it from a non-potable source. The device designed for this purpose is a back flow prevention device, engineered to block reverse flow even when pressure in the non-potable line fluctuates or when back-siphonage occurs. These assemblies often combine one or more check valves with relief components or vents to ensure the potable supply cannot be contaminated.

A pressure reducing valve lowers the pressure in the system but does not by itself stop backflow. A globe valve is used to throttle or shut off flow, not specifically to prevent backward flow into the potable supply. A single check valve blocks flow in one direction but may not provide complete protection in all cross-connection scenarios and may not meet code requirements for backflow protection.