Which valve type is used for automatic backflow protection in arrangements where backflow is possible?

Which valve type is used for automatic backflow protection in arrangements where backflow is possible?

• A. Gate valve
• B. Diaphragm valve
• C. Ball valve
• D. Check valve

Answer: (D)

Automatic backflow protection relies on a valve that closes on reverse flow. A check valve is designed to let fluid flow in one direction and automatically shut when flow reverses, preventing backflow without any manual action. Other valves like gate, diaphragm, or ball valves control or isolate flow but don’t respond automatically to reverse pressure, so they aren’t suited for automatic backflow protection in arrangements where backflow could occur.

Automatic backflow protection relies on a valve that closes on reverse flow. A check valve is designed to let fluid flow in one direction and automatically shut when flow reverses, preventing backflow without any manual action. Other valves like gate, diaphragm, or ball valves control or isolate flow but don’t respond automatically to reverse pressure, so they aren’t suited for automatic backflow protection in arrangements where backflow could occur.