Historical
DIN EN ISO 16137:2006
Industrial valves - Check valves of thermoplastics materials (ISO 16137:2006); German version EN ISO 16137:2006
This Standard specifies requirements and tests for check valves in thermoplastic materials with the function to allow the flow of liquid fluids through the valve in one direction only and to prevent backflow. It is applicable to check valves to be installed in industrial pipe systems, irrespective of the field of application and the liquid fluids to be conveyed.
Deutsches Institut für Normung [din]