What device is chosen to protect against reverse flow in a system?

A check valve is specifically designed to prevent reverse flow in a system. This device allows fluid to flow in one direction while automatically closing whenever there is a tendency for flow in the opposite direction. This is crucial in maintaining the integrity of process systems, preventing contamination and protecting equipment from potential damage caused by backflow.

Check valves are commonly used in applications where it is essential to avoid situations that could lead to backflow, such as in liquid pipelines, water and wastewater treatment processes, or any system where the direction of flow should be tightly controlled. By ensuring that the valve only opens with forward flow and remains closed against reverse flow, a check valve effectively maintains the intended flow direction and enhances the safety and reliability of the system.

In comparison, other valves like ball valves, gate valves, and globe valves are primarily designed for stopping or regulating flow but do not inherently prevent backflow. While they can be used in isolation or control applications, they lack the automatic check function that a check valve provides, making the check valve the most suitable choice for protecting against reverse flow.