Anti-pollution check valves. DN 6 to DN 250 inclusive Family E, type A, B, C, and D Ingestion-build-105964 at the service facility works

at the service facility works

The design and development process of the high voltage electrical equipment should be able to identify hazards and the risks arising from them

The methods mentioned in BS EN 50281-2-1

This International Standard supersedes BS EN 20898-1:1992 which is withdrawn

Anti-pollution check valves. DN 6 to DN 250 inclusive Family E, type A, B, C, and D Ingestion-build-105964 at the service facility works1 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