The PVC True Union Swing Check Valve is an automatic valve that opens and closes based on the flow of the medium, with no manual intervention required. It is designed to prevent backflow and is also called a back-pressure valve, one-way valve, or non-return flap valve. This valve only allows flow in one direction. When the flow reverses, the valve flap automatically closes, preventing backflow.

The True Union design allows the valve to be easily removed for maintenance without disturbing the entire pipeline system. It provides sizes ranging from 1/2" to 2" and is compatible with ANSI, DIN, and JIS standards.