1. Check valves are used to prevent backflow and maintain pressure.
2. They are commonly used as: a backup in case a pump fails, to help compressors and reciprocating pumps function, and when the system pressure exceeds the primary equipment capabilities.
3. Check valves can be seen in industries such as refining, petrochemical, chemical, etc., oilfield production, water, steam, refining petro, and viscous fluids.
4. Check valves are also commonly found in waste-water management systems and in manufacturing.