Anti-pollution check valves. DN 6 to DN 250 inclusive Family E, type A, B, C, and D Ingestion-build-202139 BS EN 2139 is a

BS EN 2139 is a European Standard series that covers flat heat-resisting steel washers for aerospace applications

BS ISO 5834-2:2019 has made some technical changes compared to ISO 5834-2:2011

This document states qualification/testing for field contractors and site applied coatings to all of the pipeline components

during the in-use phase of facilities or constructed assets

Anti-pollution check valves. DN 6 to DN 250 inclusive Family E, type A, B, C, and D Ingestion-build-202139 BS EN 2139 is a1 Scope The purpose of this document is to specify: field of application of anti pollution check valves; backflow prevention properties, dimensional and physio chemical properties, and properties of general hydraulic, mechanical and acoustic design for anti pollution check valves of nominal sizes DN 6 to DN 250 inclusive; family E, type A, controllable anti pollution check valve (with test port); family E, type B, non controllable anti pollution check