BS EN ISO 16137:2006+A1:2019

This International Standard specifies requirements for the design, functional characteristics and manufacture of check valves made of thermoplastics materials intended to allow the flow of liquid fluids through the valve in one direction only and to prevent backflow, their connection to the pipe system, the body materials and their pressure/temperature rating between−40°C and+120°C, for a lifetime of 25years, and also specifies their tests.This International Standard is applicable to valves to be installed in industrial pipe systems, irrespective of the field of application and the fluids to be conveyed.NOTE1 Industrial pipe systems also include systems for water supply for general purposes, drainage and sewerage.NOTE2 Special requirements can apply to pipe systems for water for human consumption.This document is concerned with the range of DNDN 8, DN 10, DN 15, DN 20, DN 25, DN32, DN 40, DN 50, DN 65, DN 80, DN 100, DN 125, DN 150, DN 200, DN 250, DN 300, DN 350, DN 400, DN 500 and DN 600.and the range of PN and ClassPN 6, PN 10, PN 16, PN 25 and Class 150 and Class 300.NOTE3 Different DN and/or PN can be declared by the manufacturer.