What does a check valve do?

What does a check valve do?

• A. A device that controls the direction of water flow.
• B. Permits water flow in one direction.
• C. Backs water into the potable water system.
• D. Regulates pipeline temperature.

Answer: (B)

A check valve acts as a one-way gate in a piping system. It allows water to move in the intended direction and automatically closes to stop any reverse flow, protecting the potable water supply from backflow during pressure changes or when demand from fire protection or other fixtures could create reverse pressure. It doesn’t regulate temperature, and it isn’t about pushing water back into the system—it’s specifically designed to prevent backflow.

A check valve acts as a one-way gate in a piping system. It allows water to move in the intended direction and automatically closes to stop any reverse flow, protecting the potable water supply from backflow during pressure changes or when demand from fire protection or other fixtures could create reverse pressure. It doesn’t regulate temperature, and it isn’t about pushing water back into the system—it’s specifically designed to prevent backflow.