Which component prevents backflow in spray equipment by allowing flow in one direction only?

• A. Carrier
• B. Check valve
• C. Cone-Spray nozzle
• D. Containment system

Answer: (B)

The concept being tested is preventing fluid from flowing backward in spray equipment. The component that does this is the check valve. A check valve allows fluid to move in one direction because it automatically opens when forward pressure pushes the fluid through, then seats or seals to stop any reverse flow. This is crucial in spraying because it prevents chemicals from siphoning back into the supply line or tank, protecting water sources and keeping the system from contaminating itself.

The other items don’t perform this directional protection. The carrier is simply the liquid being sprayed, not a flow-control device. The cone-spray nozzle controls the spray pattern but doesn’t prevent reverse flow. The containment system deals with spills or leaks, not the direction of flow in the spray line.