What type of valve allows water to flow in only one direction in plumbing systems?

A check valve is specifically designed to allow fluid or water to flow in only one direction, which is crucial in plumbing systems to prevent backflow. When water moves in the desired direction, the valve opens, permitting free flow. If water tries to flow in the reverse direction, the valve closes, stopping any potential backflow. This feature is particularly important for maintaining the integrity and efficiency of plumbing systems, protecting pumps and other components from damage that can occur due to reverse flow.

In contrast, the other types of valves listed serve different purposes. A gate valve is primarily used to start or stop the flow of water and does not inherently prevent backflow. A ball valve provides quick shut-off capabilities but can still allow reverse flow if not designed with a sealing mechanism. A globe valve is often used for regulating flow but likewise does not ensure one-way flow. The construction and function of a check valve make it the most suitable choice for preventing backward flow in plumbing applications.