What is the primary function of a check valve?

• A. To increase pressure in a system
• B. To allow fluid to flow in one direction only
• C. To connect multiple hoses
• D. To measure fluid flow rates

Answer: (B)

The primary function of a check valve is to allow fluid to flow in one direction only. This design ensures that the fluid does not backflow, which is critical in maintaining system integrity and preventing potential damage to equipment or fluid contamination.

Check valves are typically used in various applications, such as in pumps and piping systems, to maintain flow direction and safeguard against reverse flow that could disrupt processes. For instance, in a water supply system, a check valve prevents water from flowing back into the source, ensuring a consistent supply in the intended direction.

This function makes check valves essential components in various industrial and plumbing applications, as they help to maintain efficiency and safety within fluid systems.