標準號：BS EN 12729-2002
中文標準名稱：防飲用水回流污染設備.帶減壓區的可控制回流防止器.B系列A型
英文標準名稱：Devices to prevent pollution by backflow of potable water - Controllable backflow preventer with reduced pressure zone - Family B. Type A
標準類型：P42
發布日期：2003/1/30 12:00:00
實施日期：2003/1/30 12:00:00
中國標準分類號：P42
國際標準分類號：13.060.20;91.140.60
引用標準：EN 806-1-2000;EN 1092-1;EN 1092-2;EN 1717-2000;EN ISO 3822-1;EN ISO 3822-3-1997;EN ISO 6509;prEN 13959;ISO 7-1;ISO 228-1;ISO 9227
適用范圍：This European Standard specifies the field of application, the dimensional, the physico-chemical, the design, the hydraulic, the mechanical, and the acoustic characteristics of controllable backflow preventer with reduced pressure zone Family B Type A. This standard covers controllable backflow preventers of Family B Type A, with reduced pressure zones, intended to prevent backflow by backsiphoning or backpressure of water into the potable water distribution system whenever the pressure of the latter is lower than the system located downstream. It is applicable to controllable backflow preventers in denominations DN 8 up to DN 250. It covers controllable backflow preventers of PN 10 that are capable of working without modification or adjustment: — at any pressure up to 1 MPa (10 bar); — with any pressure variation up to 1 MPa (10 bar); — in permanent duty at a limited temperature of 65 ℃ and 90 ℃ for 1 h maximum. It specifies also the test methods and requirements for verifying their characteristics, the marking and the presentation at delivery.