DS EN 14454:2005
DS EN 14454:2005 Devices To Prevent Pollution By Backflow Of Potable Water - Hose Union Backflow Preventer Dn 15 To Dn 32 Inclusive - Family H, Type A Defines the characteristics of hose union backflow preventers DN 15 to DN 32 that are suitable for use in drinking water systems at pressures up to 1 MPa (10 bar) and temperatures up to 65 Celsius deg