What type of valve is primarily used to prevent backflow in a cargo pump system?

The check valve is specifically designed to allow fluid to flow in one direction and prevent backflow, making it the ideal choice for use in cargo pump systems. When pressurized liquid flows through the valve, the internal mechanism opens to permit that flow. If there's a reverse flow attempt, the valve automatically closes, creating a barrier that stops the fluid from flowing back into the system.

This characteristic is crucial in cargo pump systems, where backflow could lead to contamination, operational issues, or safety hazards. In contrast, globe valves, butterfly valves, and gate valves do not have the same inherent mechanism to prevent backflow. While they can control flow direction and shut off flow, they do not provide the one-way flow protection that is critical in maintaining the integrity of the cargo transfer system. Thus, in this context, the check valve is the most suitable and effective choice for preventing backflow in cargo pump systems.